Tootfinder

from my link log —
CHICKEN Scheme internals: the garbage collector.
https://www.more-magic.net/posts/internals-gc.html
saved 2025-08-08

Mass stratification in the globular cluster system revealing the assembly history of the nearest S0 galaxy NGC 3115
Haoran Dou, Hao Li, Hongxin Zhang, Heng Yu, Huiyuan Wang
https://arxiv.org/abs/2509.21975

Mass stratification in the globular cluster system revealing the assembly history of the nearest S0 galaxy NGC 3115
Galaxy formation and evolution is hierarchical. The most massive galaxies are thought to form their central regions early through violent dissipational processes, then grow inside-out by accreting smaller satellites. While widely supported, direct observational confirmation of this process in individual galaxies remains lacking, except for the Milky Way. We present a detailed analysis of globular cluster (GC) candidates within a $70^\prime$ ($\sim190$ kpc) radius around the nearest S0 galaxy, N…

Ah, c’est intéressant, ça! (Je l’avais raté, h/t Š @….)
VoilŠ la détermination du Grand Conseil concernant les licences et produits informatiques:
«Le parlement invite le Conseil d'Etat Š tout mettre en oeuvre pour diminuer l'exposition de l’Etat de Vaud aux services et licences et produits informatiques américains, en envisageant de les rempla…

This is why you apply the Principle of Least Privilege, friends.
(Short: don’t give access to things people don’t absolutely need access to; and then when you DO have access to something, don’t use it persistently unless you absolutely need to.)
(link via @… )

La deuxième détermination est également très intéressante:
«Le Grand Conseil émet le vœu que le Conseil d’État interrompe ses relations avec les sociétés HP Inc. et Hewlett Packard Enterprise (HP-E), afin de ne plus continuer Š soutenir financièrement une entreprise complice des crimes de guerres de l’armée israélienne.»

La deuxième détermination est également très intéressante:
«Le Grand Conseil émet le vœu que le Conseil d’État interrompe ses relations avec les sociétés HP Inc. et Hewlett Packard Enterprise (HP-E), afin de ne plus continuer Š soutenir financièrement une entreprise complice des crimes de guerres de l’armée israélienne.»

Hourly maps at ground level of Wildfire Smoke Fine Particulate Matter PM2.5, for regions and North America | Environment #Canada
https://weather.gc.ca/firework/firework_anim_e…

Catalpa: GC for a Low-Variance Software Stack
Anthony Arnold, Mark Marron
https://arxiv.org/abs/2509.13429 https://arxiv.org/pdf/2509.13429

Catalpa: GC for a Low-Variance Software Stack
The performance of an application/runtime is usually conceptualized as a continuous function where, the lower the amount of memory/time used on a given workload, then the better the compiler/runtime is. However, in practice, good performance of an application is viewed as more of a binary function - either the application responds in under, say 100 ms, and is fast enough for a user to barely notice, or it takes a noticeable amount of time, leaving the user waiting and potentially abandoning the…

The #FAST #GlobularCluster #Pulsar Survey (GC FANS): https://iopscience.iop.org/article/10.3847/1538-4365/ade4ba -> interview with the first two authors: https://www.youtube.com/watch?v=yIdIoOnMP9c

The Goldbach Conjecture as an Informational Economy Principle: A Heuristic Framework from Computational Physics
Ricardo Adonis Caraccioli Abrego
https://arxiv.org/abs/2508.18273

The Goldbach Conjecture as an Informational Economy Principle: A Heuristic Framework from Computational Physics
This paper presents a heuristic framework for analyzing the Goldbach Conjecture (GC) from the perspective of the physics of information. Through empirical analysis, we propose an Informational Economy Principle (IEP), which posits that differences between prime numbers tend to be resolved by pairs with a minimal sum with over- whelmingly high probability. We argue that this tendency is analogous to least-action principles in physics and is consistent with the fundamental physical limits of comp…

GC-VLN: Instruction as Graph Constraints for Training-free Vision-and-Language Navigation
Hang Yin, Haoyu Wei, Xiuwei Xu, Wenxuan Guo, Jie Zhou, Jiwen Lu
https://arxiv.org/abs/2509.10454

GC-VLN: Instruction as Graph Constraints for Training-free Vision-and-Language Navigation
In this paper, we propose a training-free framework for vision-and-language navigation (VLN). Existing zero-shot VLN methods are mainly designed for discrete environments or involve unsupervised training in continuous simulator environments, which makes it challenging to generalize and deploy them in real-world scenarios. To achieve a training-free framework in continuous environments, our framework formulates navigation guidance as graph constraint optimization by decomposing instructions into…

On the usage of $2$-node lines in $n$-correct and $GC_n$ sets
Hakop Hakopian, Gagik Vardanyan, Navasard Vardanyan
https://arxiv.org/abs/2508.13289 https://…

On the usage of $2$-node lines in $n$-correct and $GC_n$ sets
An $n$-correct set $\mathcal{X}$ in the plane is a set of nodes admitting unique interpolation with bivariate polynomials of total degree at most $n$. A $k$-node line is a line passing through exactly $k$ nodes of $\mathcal{X}.$ A line can pass through at most $n+1$ nodes of an $n$-correct set. An $(n+1)$-node line is called maximal line (C. de Boor, 2007). We say that a node $A\in\mathcal{X}$ uses a line $\ell,$ if $\ell$ is a factor of the fundamental polynomial of the node $A.$ Let $\mat…

We're so desperate for justice. We're in desperate need of heroes. And then Mon Mothma...
LEFT. NO. CRUMBS.
▶️ Star Wars Fans React To Andor 2X9 | 'WELCOME TO THE REBELLION' - Strange Reactions
https://youtube.com/watch?v=meD30pDK-Gc&si=a6qfJGE…

Supergiant GCIRS 22 in the Milky Way Nuclear Star Cluster: Revised alpha abundances
B. Thorsbro, S. Khalidy, R. M. Rich, M. Schultheis, D. Taniguchi, A. M. Amarsi, G. Kordopatis, G. Nandakumar, S. Nishiyama, N. Ryde
https://arxiv.org/abs/2509.20075

Supergiant GCIRS 22 in the Milky Way Nuclear Star Cluster: Revised alpha abundances
Context: The chemical abundances of alpha-elements in Galactic Centre (GC) supergiants provide key insights into the chemical enrichment and star formation history of the Milky Way's Nuclear Star Cluster. Previous studies have reported enhanced alpha-element abundances, raising questions about the chemical evolution of this unique region. Aims: We aim to reassess the alpha-element abundances in the GC supergiant GCIRS 22 using updated spectral modelling and non-local thermodynamic equilibrium…

Weather Alerts Metro #Vancouver -
Warnings
8:10 AM PDT Monday 11 August 2025
Heat Warning in effect for:
Metro Vancouver
This is a heat warning. Temperature are very high and there is a moderate risk to public health.
What: Temperatures reaching 33 degrees Celsius combined with overnight lows near 17 degrees Celsius.
Metro Vancouver (inland and eastern sections)…

A joint 1% calibration of the RR Lyrae & type-II Cepheid Leavitt laws yields homogeneous distances to 93 Galactic globular clusters
Bastian Lengen, Richard I. Anderson, Mauricio Cruz Reyes, Giordano Viviani
https://arxiv.org/abs/2509.16331

A joint 1% calibration of the RR Lyrae & type-II Cepheid Leavitt laws yields homogeneous distances to 93 Galactic globular clusters
Recent work has established large samples of astrometrically confirmed RR Lyrae and type-II Cepheid members of Galactic globular clusters (GCs). Any given GC can contain multiple such stars at once, notably RR Lyrae stars pulsating in the fundamental mode (RRab) or the first overtone (RRc), and type-II Cepheids (T2Cep) of BL Her and W Vir types. Here, we present the first joint calibration of the Leavitt laws (LLs) exhibited by 802 RRab, 345 RRc, and 21 T2Cep stars anchored to trigonometric par…

Investigation of Cathode Electrolyte Interphase Formation via Coupling Liquid Electrochemical TEM and GC/MS
Kevyn Gallegos-Moncayo, Josephine Rezkallah, Justine Jean, Arash Jamali, Gr\'egory Gachot, Arnaud Demorti\`ere
https://arxiv.org/abs/2510.12467

Investigation of Cathode Electrolyte Interphase Formation via Coupling Liquid Electrochemical TEM and GC/MS
A deeper understanding of the cathode electrolyte interphase (CEI) formation mechanism is essential to elucidate battery degradation. Here, we combine Liquid Electrochemical Transmission Electron Microscopy (ec-TEM) with Gas Chromatography/Mass Spectrometry (GC/MS) to monitor CEI evolution in a realistic electrochemical environment, focusing on electrolyte behavior under high voltages. The correlation between the electrochemical response, gas and liquid analysis after cycling, and the observati…

Global coalition sets in graphs
Nazli Besharati, Doost Ali Mojdeh, Mohammad Reza Samadzadeh
https://arxiv.org/abs/2509.15386 https://arxiv.org/pdf/2509.153…

Global coalition sets in graphs
Let $G=(V,E)$ be a graph. A subset $S \subseteq V$ is called a global dominating set of $G$, if it serves as a dominating set in both $G$ and its complement $\overline{G}$. We define two disjoint subsets $V_1,V_2 \subseteq V$ to form a global coalition if neither $V_1$ nor $V_2$ individually constitutes a global dominating set, yet their union $V_1 \cup V_2$ does. A global coalition partition (abbreviated as $gc$-partition) of $G$ is a vertex partition $π$ of $V(G)$ such that for every subset …

Last data point for today - a comparison of Canada and 3 of our largest trading partners in the agricultural industry. Again, there are lots of interesting numbers, but one factoid that jumped out to me: Canada is farming 6.2% of our land versus the United Kingdom at 75.0%, the United States at 36.8% and Japan 11.8%.
https://www150.statcan.gc.ca/n1/pub/96-325-x/2021001/article/00012-eng.htm

On Chebyshev centers in Banach spaces
Syamantak Das, Tanmoy Paul
https://arxiv.org/abs/2508.11087 https://arxiv.org/pdf/2508.11087

On Chebyshev centers in Banach spaces
In this note, we observe that $X\in (GC)$ if $X$ admits Chebyshev center for any finite set in it. This answers the problem raised by Veselý, addressed in [{\em Generalized centers of finite sets in Banach spaces}, Acta Math. Univ. Comenian. (N.S.) {\bf 66}(1) (1997), 83--115]. We extend our observation towards the fact that the property $(GC)$ is not a 3-space property.

Crosslisted article(s) found for cs.SE. https://arxiv.org/list/cs.SE/new
[1/1]:
- Catalpa: GC for a Low-Variance Software Stack
Anthony Arnold, Mark Marron
https:…

Replaced article(s) found for cs.CV. https://arxiv.org/list/cs.CV/new
[1/5]:
- GC-MVSNet: Multi-View, Multi-Scale, Geometrically-Consistent Multi-View Stereo
Vibhas K. Vats, Sripad Joshi, David J. Crandall, Md. Alimoor Reza, Soon-heung Jung

A test of Ca ii H & K photometry for isolating massive globular clusters below the metallicity floor
Bas van Heumen, William E. Harris, S{\o}ren S. Larsen, Else Starkenburg
https://arxiv.org/abs/2508.13031

A test of Ca ii H & K photometry for isolating massive globular clusters below the metallicity floor
The serendipitous discovery of the M31 globular cluster (GC) EXT8 has presented a significant challenge to current theories for GC formation. By finding other GCs similar to EXT8, it should become clear if and/or how EXT8 can fit into our current understanding of GC formation. We aim to test the potential of integrated-light narrow-band Ca II H & K photometry as a proxy for the metallicity of GCs to be able to provide effective candidate selection for massive GCs below the GC metallicity floor …

Scavenger : Revisiting Space-Time Tradeoffs in Key-Value Separated LSM-trees
Jianshun Zhang, Fang Wang, Jiaxin Ou, Yi Wang, Ming Zhao, Sheng Qiu, Junxun Huang, Baoquan Li, Peng Fang, Dan Feng
https://arxiv.org/abs/2508.13935

Scavenger+: Revisiting Space-Time Tradeoffs in Key-Value Separated LSM-trees
Key-Value Stores (KVS) based on log-structured merge-trees (LSM-trees) are widely used in storage systems but face significant challenges, such as high write amplification caused by compaction. KV-separated LSM-trees address write amplification but introduce significant space amplification, a critical concern in cost-sensitive scenarios. Garbage collection (GC) can reduce space amplification, but existing strategies are often inefficient and fail to account for workload characteristics. Moreove…

Investigating Phosphorus Abundances in a Sample of APOGEE-2 Bulge Globular Clusters
Beatriz Barbuy, Jos\'e G. Fern\'andez-Trincado, Morgan S. Camargo, Doug Geisler, Maren Brauner, Sandro Villanova, Dante Minniti, Domingo Anibal Garc\'ia-Hern\'andez, Stefano O. Souza, Heitor Ernandes, Am\^ancio Fria\c{c}a, Marco Pignatari
https://

Investigating Phosphorus Abundances in a Sample of APOGEE-2 Bulge Globular Clusters
Phosphorus enhanced (P-rich; [P/Fe] > 0.8) giants have been found among mildly metal-poor fiels stars, but in only one star in a globular cluster (GC), M4 (NGC 6121). Also, in a sample of bulge spheroid stars, some of them showed a moderate P-enhancement in the range +0.5 < [P/Fe] < +1.0. In this paper we derive the P abundance of moderately metal-poor ([Fe/H] ~-1) GC stars, aiming to check if the phenomenon could be related to the unusual multiple stellar populations found in most GCs. Here we…

from my link log —
Lifetime dispersion and generational GC.
https://dl.acm.org/doi/10.1145/3735950.3735958
saved 2025-06-24 https…

Replaced article(s) found for cs.IT. https://arxiv.org/list/cs.IT/new
[1/1]:
- GC Code: A Systematic Short Blocklength Code for Correcting Random Edit Errors in DNA Storage
Serge Kas Hanna

Second Discovery of GeV-TeV Connection from the Globular Cluster UKS 1
Jiwon Shin (Chungnam National University), C. Y. Hui (Chungnam National University), Sangin Kim (Chungnam National University), Kwangmin Oh (Michigan State University), Ellis R. Owen (RIKEN, Osaka University)
https://arxiv.org/abs/2510.11215

Second Discovery of GeV-TeV Connection from the Globular Cluster UKS 1
Using 16 years of data collected by Fermi Large Area Telescope and 1523 days of survey data from High Altitude Water Cherenkov (HAWC) Observatory, we discovered the long-sought second GeV-TeV connection towards the globular cluster (GC) UKS 1 (Shin et al. 2025). Gamma-ray spectroscopy suggests that the GeV emission can be attributed to both the pulsar magnetosphere and inverse Compton scattering (ICS) by the pulsar wind. In particular, the TeV peak is displaced from the cluster center by severa…

Student Conference: L'Étrangeté
https://ift.tt/KlsBJPm
updated: Monday, September 15, 2025 - 3:46pmfull name / name of organization: CUNY GC French Dept.…
via Input 4 RELCFP https://

Scavenger: Better Space-Time Trade-Offs for Key-Value Separated LSM-trees
Jianshun Zhang, Fang Wang, Sheng Qiu, Yi Wang, Jiaxin Ou, Junxun Huang, Baoquan Li, Peng Fang, Dan Feng
https://arxiv.org/abs/2508.13909

Scavenger: Better Space-Time Trade-Offs for Key-Value Separated LSM-trees
Key-Value Stores (KVS) implemented with log-structured merge-tree (LSM-tree) have gained widespread acceptance in storage systems. Nonetheless, a significant challenge arises in the form of high write amplification due to the compaction process. While KV-separated LSM-trees successfully tackle this issue, they also bring about substantial space amplification problems, a concern that cannot be overlooked in cost-sensitive scenarios. Garbage collection (GC) holds significant promise for space amp…

Probing globular clusters using modulated gravitational waves from binary black holes
Jie Wu, Yao Xiao, Mengfei Sun, Jin Li
https://arxiv.org/abs/2508.04021 https://

Probing globular clusters using modulated gravitational waves from binary black holes
Globular clusters (GCs) are crucial for studying stellar dynamics and galactic structure, yet precise measurements of their distances and masses are often limited by uncertainties in electromagnetic (EM) observations. We present a novel method that leverages gravitational waves (GWs) from stellar-mass binary black holes (BBHs) orbiting within GCs to enhance the precision of GC parameter measurements. The BBH's orbital motion imprints characteristic modulations on the GW waveform, encoding infor…

Genome-Factory: An Integrated Library for Tuning, Deploying, and Interpreting Genomic Models
Weimin Wu, Xuefeng Song, Yibo Wen, Qinjie Lin, Zhihan Zhou, Jerry Yao-Chieh Hu, Zhong Wang, Han Liu
https://arxiv.org/abs/2509.12266

Genome-Factory: An Integrated Library for Tuning, Deploying, and Interpreting Genomic Models
We introduce Genome-Factory, an integrated Python library for tuning, deploying, and interpreting genomic models. Our core contribution is to simplify and unify the workflow for genomic model development: data collection, model tuning, inference, benchmarking, and interpretability. For data collection, Genome-Factory offers an automated pipeline to download genomic sequences and preprocess them. It also includes quality control, such as GC content normalization. For model tuning, Genome-Factory…

JWST Photometry of Globular Cluster Populations in MACS0417.5-1154
William E. Harris, Marta Reina-Campos, Kaitlyn E. Keatley, Marusa Bradac, Nicholas S. Martis, Adam Muzzin, Gael Noirot, Ghassan T. E. Sarrouh, Marcin Sawicki, Chris J. Willott, Samantha C. Berek
https://arxiv.org/abs/2509.14473

JWST Photometry of Globular Cluster Populations in MACS0417.5-1154
Deep JWST imaging of the massive galaxy cluster MACS0417.5-1154, at redshift z=0.443, reveals a huge population of globular clusters (GCs) and Ultra-Compact Dwarfs (UCDs) primarily distributed around its single central giant galaxy (BCG). We present NIRCam/SWC photometry of the GC system in four bands (F090W, F115W, F150W, F200W). The spatial distribution of the system matches well in radial and ellipticity profile with the high elongation (b/a = 0.5) of the BCG halo light. The total GC populat…

NEURODNAAI: Neural pipeline approaches for the advancing dna-based information storage as a sustainable digital medium using deep learning framework
Rakesh Thakur, Lavanya Singh, Yashika, Manomay Bundawala, Aruna Kumar
https://arxiv.org/abs/2510.02417

NEURODNAAI: Neural pipeline approaches for the advancing dna-based information storage as a sustainable digital medium using deep learning framework
DNA is a promising medium for digital information storage for its exceptional density and durability. While prior studies advanced coding theory, workflow design, and simulation tools, challenges such as synthesis costs, sequencing errors, and biological constraints (GC-content imbalance, homopolymers) limit practical deployment. To address this, our framework draws from quantum parallelism concepts to enhance encoding diversity and resilience, integrating biologically informed constraints with…

Student Conference: L'Étrangeté
https://ift.tt/KlsBJPm
updated: Monday, September 15, 2025 - 3:46pmfull name / name of organization: CUNY GC French Dept.…
via Input 4 RELCFP https://

Breaking Down the $\textsf{CosmoGEMS}$: Toward Modeling and Understanding Globular Cluster Stellar Streams in a Fully Cosmological Context
Nondh Panithanpaisal, Robyn E. Sanderson, Carl L. Rodriguez, Tjitske Starkenburg, Sarah Pearson, Ana Bonaca, Philip F. Hopkins, Brian T. Cook, Arpit Arora, Newlin C. Weatherford
https://arxiv.org/abs/25…

Breaking Down the $\textsf{CosmoGEMS}$: Toward Modeling and Understanding Globular Cluster Stellar Streams in a Fully Cosmological Context
Next-generation surveys are expected to uncover thousands of globular cluster (GC) stellar streams, motivating the need for a theoretical framework that produces realistic GC streams in a fully cosmological, Milky Way-like environment. We present $\textsf{CosmoGEMS}$, a star-by-star cosmological GC stream framework that self-consistently links small-scale cluster physics with large-scale Galactic dynamics. The initial phase-space positions of stream stars are informed by post-processed GC popul…

Millisecond Pulsars in M2: New discoveries and a detailed timing analysis
Baoda Li, Kuo Liu, Lin Wang, Shunyi Lan, P. C. C. Freire, Pinsong Zhao, Liyun Zhang, Zhengwei Liu, Lei Qian, Wu Jiang, Dejiang Yin, Yaowei Li, Yinfeng Dai, Yang Liu, Xiangcun Meng, Zhichen Pan
https://arxiv.org/abs/2508.06726…

Millisecond Pulsars in M2: New discoveries and a detailed timing analysis
Globular clusters (GCs) offer a unique environment for discovering and studying millisecond pulsars. In this paper, we present a multi-epoch search and detailed timing analysis of millisecond pulsars in the GC M2, using the Five-hundred-meter Aperture Spherical Telescope. We have discovered two new binary millisecond pulsars in M2, designated M2F and M2G, respectively. We provide measurements of the emission properties of all known pulsars in M2, including their polarization profiles, rotation …

Tracing {\omega}Centauri's origins: Spatial and chemical signatures of its formation history
E. Dondoglio, A. P. Milone, A. F. Marino, A. Mastrobuono-Battisti, E. Bortolan, M. V. Legnardi, T. Ziliotto, F. Muratore, G. Cordoni, E. P. Lagioia, M. Tailo
https://arxiv.org/abs/2509.16719

Tracing ωCentauri's origins: Spatial and chemical signatures of its formation history
ω}Centauri (ωCen) is the most enigmatic Galactic globular cluster (GC), with unmatched chemical complexity. We combine photometric and spectroscopic catalogs to identify its distinct stellar populations and to investigate their spatial distribution and chemical properties, uncovering new insights into the cluster's formation history. We identify the iron-poor stars commonly found in GCs: the first population (1P), with halo-like chemical composition, and the second population (2P), enriched i…

Good Morning #Canada
Day #8 of The Dirt on Canadian Farming takes us back east to New Brunswick, which is not that "new" BTW. If it seems like we're jumping around the country in this series, with no logic, well, congratulations, you're paying attention.
New Brunswick's agricultural and agri-food sector reached a record of $1.23 billion in farm cash receipts in 2023, with potatoes, blueberries, maple syrup, and dairy all key products. Within that number lies good and bad news. The province had one of the largest decreases in farm operators in the country, but profits per farm have increased. Blueberry farms increased, and the province is 2nd in Canada in production. In 2024, New Brunswick announced the Agricultural Sustainability Program to assist farmers with reducing tillage, maintaining ponds and wetlands, and protecting pollinator habitat, critical and marginal landscapes, trees, riparian areas and crop management.
#CanadaIsAwesome #Farming
https://www150.statcan.gc.ca/n1/pub/95-640-x/2016001/article/14803-eng.htm

Milky Way's Metal-Poor Stars display Chemical Transition near the Solar Radius
Khyati Malhan
https://arxiv.org/abs/2508.08360 https://arxiv.org/pdf/250…

Milky Way's Metal-Poor Stars display Chemical Transition near the Solar Radius
The metal-poor stars of a galaxy offer insights into that galaxy's early formation processes and accretion history. Here, we investigate whether the metal-poor stars of our Milky Way galaxy exhibit any characteristic trends in Galactocentric distance versus chemical abundances -- i.e. in the space of $r_{\rm GC}$ vs. [Fe/H] and $r_{\rm GC}$ vs. [X/Fe] -- and if yes, then what is their implication for Galaxy formation. We combine the datasets of APOGEE DR17 and $\textit{Gaia}$ DR3, where the for…

Good Morning #Canada
The Dirt on Canadian Farming now enters Day #6, and we'll hang around the east coast today.
Nova Scotia is one of the most challenging regions for agriculture as it is limited by ocean, a rocky landscape, cool and wet climate, and acidic soil. Some of those conditions are ideal for blueberries and apples, and those farms have increased recently with the rise in fresh fruit prices. Grape growing and wine production is another sector increasing and difficult to keep bottled up. Wineries are French hybrid stock suitable for the local conditions. The rest of Nova Scotia's agriculture is made up of dairy, pigs, and maple syrup. Mink production, once a sizeable portion of the province's exports, has decreased significantly since fur coats have thankfully gone out of fashion.
#CanadaIsAwesome #Pies
https://www150.statcan.gc.ca/n1/pub/96-325-x/2021001/article/00003-eng.htm

Distance measurements from the internal dynamics of globular clusters: Application to the Sombrero galaxy (M 104)
Katja Fahrion, Michael A. Beasley, Anastasia Gvozdenko, Glenn van de Ven, Katherine L. Rhode, Ana L. Chies-Santos, Anna Ferre-Mateu, Marina Rejkuba, Oliver M\"uller, Eric Emsellem
https://arxiv.org/abs/2509.14948

Distance measurements from the internal dynamics of globular clusters: Application to the Sombrero galaxy (M 104)
Globular clusters (GCs) are dense star clusters found in all massive galaxies. Recent work has established that they follow a tight relation between their internal stellar velocity dispersion $σ$ and luminosity, enabling accurate distance measurements. In this work, we aim to apply this GC velocity dispersion (GCVD) distance method to measure the distance to M 104 (NGC 4594, the Sombrero galaxy). We have measured internal stellar velocity dispersions for 85 globular clusters (GCs) and one ultr…

JWST NIRCam Observations of the Globular Cluster Population of RXJ 2129.7 0005
Kaitlyn E. Keatley, William E. Harris
https://arxiv.org/abs/2508.03626 https://

JWST NIRCam Observations of the Globular Cluster Population of RXJ 2129.7+0005
We present an analysis of the globular cluster (GC) population in the galaxy cluster RXJ 2129.7+0005 (z = 0.234) based on JWST NIRCam imaging in three filters: F115W, F150W, and F200W. We use this material to provide a detailed look at the color-magnitude distribution of the GCs and their spatial distribution around the central giant galaxy. We identified 3,160 GC candidates brighter than F150W=29.5, and assessed photometric completeness through artificial star tests. We determined that the GCs…

Good Morning #Canada
On August 7, 1927, the Peace Bridge, an international bridge spanning the Niagara River between Buffalo, New York, and Fort Erie, Ontario, was dedicated. This event commemorated over a century of peace between the United States and Canada. I'm guessing there won't be a ceremony for 200 years of peace since we're now the "nasty Canadians."
#CanadaIsAwesome #History #ElbowsUp
https://www.veterans.gc.ca/en/remembrance/memorials/canada/peace-bridge-0

Origin of High Dark Remnant Fractions in Milky Way Globular Clusters: The Crucial Role of Initial Black Hole Retention
Ali Rostami-Shirazi, Holger Baumgardt, Akram Hasani Zonoozi, Mojtaba Ghasemi, Hosein Haghi
https://arxiv.org/abs/2508.12167

Origin of High Dark Remnant Fractions in Milky Way Globular Clusters: The Crucial Role of Initial Black Hole Retention
Comparing the dynamical and stellar masses of Milky Way (MW) globular clusters (GCs) reveals a discrepancy exceeding a factor of two. Since this substantial invisible mass is concentrated in the cluster centre, it is attributed to stellar remnants. The majority of mass in remnants consists of white dwarfs (WDs). Allocating over half of a GC's current mass to WDs could significantly restrict the dynamical evolution scenarios governing stellar clusters. As the most massive stars in GCs, black hol…

Looking into the faintEst WIth MUSE (LEWIS): Exploring the nature of ultra-diffuse galaxies in the Hydra-I cluster IV. A study of the Globular Cluster population in four UDGs
Marco Mirabile, Michele Cantiello, Marina Rejkuba, Steffen Mieske, Enrichetta Iodice, Chiara Buttitta, Maria Luisa Buzzo, Johanna Hartke, Goran Doll, Luca Rossi, Magda Arnaboldi, Marica Branchesi, Giuseppe D'Ago, Jesus Falcon-Barroso, Katja Fahrion, Duncan A. Forbes, Marco Gullieuszik, Michael Hilker, Felipe S…

Looking into the faintEst WIth MUSE (LEWIS): Exploring the nature of ultra-diffuse galaxies in the Hydra-I cluster IV. A study of the Globular Cluster population in four UDGs
As old stellar systems, globular clusters (GCs) are key fossil tracers of galaxy formation and interaction histories. This paper is part of the LEWIS project, an integral-field spectroscopic survey of ultra-diffuse galaxies (UDGs) in the Hydra I cluster. We use MUSE spectroscopy and new VIRCAM $H$-band imaging data to study the GC populations and dark matter content in four dwarf galaxies. We retrieved line-of-sight velocities for all sources in the observed MUSE fields. Since the spectroscopic…

Good Morning #Canada
Welcome to Day #3 of The Dirt on Canadian Farming.
When you think of Newfoundland and Labrador, fishing, rocks, and icebergs all come to mind. But there is a healthy farming industry in the province primarily built around vegetables. They also have the highest percentage of sales direct to consumers of any province, with farmers selling from stands and small retail shops on their property. Amazingly, there are no local farm crops used to make Screech.
#CanadaIsAwesome #Newfie
https://www150.statcan.gc.ca/n1/pub/96-325-x/2021001/article/00001-eng.htm

In-situ globular clusters in alternative dark matter Milky Way galaxies: a first approach to fuzzy and core-like dark matter theories
Pierre Boldrini, Paola Di Matteo
https://arxiv.org/abs/2510.02130

In-situ globular clusters in alternative dark matter Milky Way galaxies: a first approach to fuzzy and core-like dark matter theories
We present a first analysis of the dynamics of in-situ globular clusters (GCs) in Milky Way (MW)-like galaxies embedded in fuzzy dark matter (FDM) halos, combining cosmological assembly histories from the TNG50 simulation with dedicated orbital integrations and analytical models. GC populations are initialized with identical distributions in normalized $E$-$L_{z}$ in matched CDM and FDM halos. In a universe dominated by FDM, we identify three distinct regimes for the in-situ GC population depen…

Globular clusters in M104: Tracing kinematics and metallicities from the centre to the halo
Katja Fahrion, Michael A. Beasley, Eric Emsellem, Anastasia Gvozdenko, Oliver M\"uller, Marina Rejkuba
https://arxiv.org/abs/2508.10100

Globular clusters in M104: Tracing kinematics and metallicities from the centre to the halo
As ancient star clusters, globular clusters (GCs) are regarded as powerful tracers of galaxy evolution and assembly. Due to their brightness and compact sizes, GCs are employed to probe the kinematics and stellar population properties of galaxies, from the central regions out into the halo where the underlying stellar light becomes too faint for spectroscopic studies. In this work, we present a comprehensive study of the GC system of M 104 (NGC 4594, also known as the Sombrero galaxy) based on …

Good Morning #Canada
Summer is over, and this morning, approximately 5.5 million primary and secondary Canadian students go back to school. Lunches are packed, stylish new backpacks have a light load, and sneakers are fashionably untied. Stay alert for school busses, crosswalks, and that speed camera newly installed outside your local school. Yes, it's hectic today as you relearn how to get your kids out the door on time. Enjoy the change of pace because soon you'll be shoveling snow.
#CanadaIsAwesome #BackToSchool #WinterIsComing
https://www150.statcan.gc.ca/t1/tbl1/en/tv.action?pid=3710010901

Good Morning #Canada
There is a little known reporting tool on the ##StatsCan website called Canada’s Quality of Life Hub. First proposed in 2021, and launched in 2023, it is a framework that gathers data and evidence to inform priority setting and guide decision-making in various policy areas, including the budgetary process. The Framework comprises five domains –prosperity, health, environment, society, and good governance – and two cross-cutting lenses: fairness and inclusion, and sustainability and resilience. Not enough Canadians have heard of it, and I suspect very few government policies are implemented before analyzing the impact on quality of life measurement by this tool. On a positive note, #StatsCan is looking for feedback on how to improve the hub.
#CanadaIsAwesome #QualityOfLife
https://www160.statcan.gc.ca/index-eng.htm

Globular Clusters in the Galaxy Cluster MACS0416 at z = 0.397
Jessica M. Berkheimer, Rogier A. Windhorst, William E. Harris, Anton M. Koekemoer, Timothy Carleton, Seth H. Cohen, Rolf A. Jansen, Dan Coe, Jose Diego, Christopher J. Conselice, Simon P. Driver, Brenda L. Frye, Norman A. Grogin, Kate Hartman, Tyler R. Hinrichs, Benne W. Holwerda, Patrick S. Kamieneski, Kaitlyn E. Keatley, William C. Keel, Ray A. Lucas, Madeline A. Marshall, Mario Nonino, Nor Pirzkal, Massimo Ricotti, Clayto…

Globular Clusters in the Galaxy Cluster MACS0416 at z = 0.397
We present a photometric analysis of globular clusters (GCs) in the massive galaxy cluster MACS J0416.1-2403 (z = 0.397) using deep JWST/NIRCam imaging from the PEARLS program. PSF photometry in the F090W, F115W, F150W, and F200W filters was performed with DAOPHOT, yielding a catalog of 2,971 unresolved, point-like sources consistent with a GC population. Artificial star tests indicate 50% completeness at F200W = 30.63 AB mag and 80% completeness at F200W = 30.36 AB mag. Color-magnitude diagram…

Self-lensing binaries in globular clusters - predictions for ELT
Grzegorz Wiktorowicz, Matthew Middleton, Mirek Giersz, Adam Ingram, Adam McMaster, Abbas Askar, Lucas Hellstr\"om
https://arxiv.org/abs/2510.02751

Self-lensing binaries in globular clusters - predictions for ELT
Self-lensing (SL) represents a powerful technique for detecting compact objects in binary systems through gravitational microlensing effects, when a compact companion transits in front of its luminous partner. We present the first comprehensive study of SL probability within globular cluster (GC) environments, utilizing synthetic stellar populations from MOCCA simulations to predict detection rates for the Extremely Large Telescope (ELT). Our analysis incorporates finite-size lens effects for w…

Fuzzy dark matter dynamical friction: Defying galactic cannibalism of globular clusters
Adrian Szpilfidel, Pierre Boldrini, Jo Bovy, Paola Di Matteo
https://arxiv.org/abs/2510.00927

Fuzzy dark matter dynamical friction: Defying galactic cannibalism of globular clusters
We present a new implementation of fuzzy dark matter (FDM) dynamical friction within the galpy framework, enabling orbital integrations of globular clusters (GCs) across a broad range of halo-to-GC mass ratios and boson masses. In this alternative DM scenario, dynamical friction is reduced or even suppressed by heating induced by FDM density granules. We further quantify the role of baryons and solitonic cores, natural consequences of FDM in galaxies, on the efficiency of orbital decay and the …