Tootfinder

Replaced article(s) found for cs.CV. https://arxiv.org/list/cs.CV/new
[8/9]:
- FQGA-single: Towards Fewer Training Epochs and Fewer Model Parameters for Image-to-Image Translat...
Cho Yang

Disordered pinning models with contact number constraint
Giambattista Giacomin, Marco Zamparo
https://arxiv.org/abs/2507.10707 https://

Disordered pinning models with contact number constraint
Disordered pinning models are statistical mechanics models built on discrete renewal processes: renewal epochs in this context are called \emph{contacts}. It is well known that pinning models can undergo a localization/delocalization phase transition: in the localized phase the typical density of contacts is positive and the largest gap between contacts is at most of the order of the logarithm of the size $n$ of the system, whereas the system is void of contacts in the delocalized phase. When d…

VLBA astrometry of PSRs B0329 54 and B1133 16: Improved pulsar distances and comparison of global ionospheric models
Ashish Kumar, Adam T. Deller, Pankaj Jain, Javier Mold\'on
https://arxiv.org/abs/2506.14368

VLBA astrometry of PSRs B0329+54 and B1133+16: Improved pulsar distances and comparison of global ionospheric models
Very long baseline interferometry (VLBI) astrometry is used to determine the three-dimensional position and proper motion of astronomical objects. A typical VLBI astrometric campaign generally includes around ten observations, making it challenging to characterise systematic uncertainties. Our study on two bright pulsars, B0329+54 and B1133+16, involves analysis of broadband Very Long Baseline Array (VLBA) data over $\sim30$ epochs (spanning approximately $3.5\, {\rm years}$). This extended dat…

Using deep learning to characterize single-exposure double-line spectroscopic binaries
Avraham Binnenfeld, Samuel Lilek, Rami Nasser, Raja Giryes, Shay Zucker
https://arxiv.org/abs/2507.12363

Using deep learning to characterize single-exposure double-line spectroscopic binaries
Distinguishing the component spectra of double-line spectroscopic binaries (SB2s) and extracting their stellar parameters is a complex and computationally intensive task that usually requires observations spanning several epochs that represent various orbital phases. This poses an especially significant challenge for large surveys such as Gaia or LAMOST, where the number of available spectra per target is often not enough for a proper spectral disentangling. We present a new approach for charac…

AI's Euclid's Elements Moment: From Language Models to Computable Thought
Xinmin Fang, Lingfeng Tao, Zhengxiong Li
https://arxiv.org/abs/2506.23080

AI's Euclid's Elements Moment: From Language Models to Computable Thought
This paper presents a comprehensive five-stage evolutionary framework for understanding the development of artificial intelligence, arguing that its trajectory mirrors the historical progression of human cognitive technologies. We posit that AI is advancing through distinct epochs, each defined by a revolutionary shift in its capacity for representation and reasoning, analogous to the inventions of cuneiform, the alphabet, grammar and logic, mathematical calculus, and formal logical systems. Th…

Dynamical mass of the Serpens intermediate-mass young stellar system EC\,95 with DYNAMO--VLBA
Jazm\'in Ord\'o\~nez-Toro (Instituto de Radioastronom\'ia y Astrof\'isica, Universidad Nacional Aut\'onoma de M\'exico, M\'exico), Sergio A. Dzib (Max Planck Institut f\"ur Radioastronomie, Germany), Laurent Loinard (Instituto de Radioastronom\'ia y Astrof\'isica, Universidad Nacional Aut\'onoma de M\'exico, M\'exico, Black Hole Initiative a…

Dynamical mass of the Serpens intermediate-mass young stellar system EC\,95 with DYNAMO--VLBA
We present dynamical mass measurements, obtained from multi-epoch Very Long Baseline Interferometry (VLBI) observations, for the young multiple stellar system EC\,95, located in the core of the Serpens star-forming region. Our dataset includes both archival data and more recent observations obtained as part of the \textit{Dynamical Masses of Young Stellar Multiple Systems with the VLBA project} (DYNAMO--VLBA), totalling 32 epochs over 12 years of observation. The observations span more than hal…

Optimizing Federated Learning Configurations for MRI Prostate Segmentation and Cancer Detection: A Simulation Study
Ashkan Moradi, Fadila Zerka, Joeran S. Bosma, Mohammed R. S. Sunoqrot, Bendik S. Abrahamsen, Derya Yakar, Jeroen Geerdink, Henkjan Huisman, Tone Frost Bathen, Mattijs Elschot
https://arxiv.org/abs/2507.22790

Optimizing Federated Learning Configurations for MRI Prostate Segmentation and Cancer Detection: A Simulation Study
Purpose: To develop and optimize a federated learning (FL) framework across multiple clients for biparametric MRI prostate segmentation and clinically significant prostate cancer (csPCa) detection. Materials and Methods: A retrospective study was conducted using Flower FL to train a nnU-Net-based architecture for MRI prostate segmentation and csPCa detection, using data collected from January 2010 to August 2021. Model development included training and optimizing local epochs, federated rounds,…

Quantum cosmological background superposition and perturbation predictions
Kratika Mazde, Lisa Mickel, Patrick Peter
https://arxiv.org/abs/2508.06231 https://

Quantum cosmological background superposition and perturbation predictions
Predictions from early universe cosmology typically concern primordial perturbations generated during epochs where effects arising from the quantum nature of gravity may be important; quantum vacuum fluctuations being stretched to cosmological scales during a phase of inflation. Quantizing the background is then done by assuming a single close-to-classical state over which perturbations grow, as well as a Born-Oppenheimer factorization throughout the relevant phase. We present a scenario in whi…

Spectral analysis of two directly imaged benchmark L dwarf companions at the stellar-substellar boundary
William Ceva, Elisabeth C. Matthews, Emily L. Rickman, Damien S\'egransan, Arthur Vigan, Brendan P. Bowler, Thierry Forveille, Kyle Franson, Janis Hagelberg, St\'ephane Udry
https://arxiv.org/abs/2507.08654

Spectral analysis of two directly imaged benchmark L dwarf companions at the stellar-substellar boundary
We used multiple epochs of high-contrast imaging spectrophotometric observations to determine the atmospheric characteristics and thermal evolution of two previously detected benchmark L dwarf companions, HD 112863 B and HD 206505 B. We analyzed IRDIS and IFS data from VLT/SPHERE of each companion, both of which have dynamical masses near the stellar-substellar boundary. We compared each companion with empirical spectral standards, as well as constrained their physical properties through atmosp…

Long-Term Astrometric Monitoring of the Galactic Center Magnetar PSR J1745--2900
Geoffrey C. Bower, Adam T. Deller, Paul B. Demorest, Jason Dexter, Andreas Brunthaler, Gregory Desvignes, Ralph P. Eatough, Heino Falcke, Ciriaco Goddi, Michael Kramer, F. Yusef-Zadeh
https://arxiv.org/abs/2506.02348…

Long-Term Astrometric Monitoring of the Galactic Center Magnetar PSR J1745--2900
We present new astrometric observations of the Galactic Center magnetar, PSR J1745-2900, with the Very Long Baseline Array (VLBA). Combined with previously published measurements in 10 epochs that spanned 477 days, the complete data set consists of 25 epochs and 41 independent measurements that span 1984 days. These data constrain the proper motion to an accuracy of $\lesssim 2\%$ and set an upper limit on the absolute value of the magnetar's acceleration of $\lesssim (0.4, 0.2)\, {\rm mas\,y^{…

The watery atmosphere of HD~209458~b revealed by joint $K$- and $L$-band high-resolution spectroscopy
Luke Finnerty, Julie Inglis, Michael P. Fitzgerald, Daniel Echeverri, Nemanja Jovanovic, Dimitri Mawet, Geoffrey A. Blake, Ashley Baker, Randall Bartos, Benjamin Calvin, Sylvain Cetre, Jacques-Robert Delorme, Greg Doppmann, Katelyn Horstman, Chih-Chun Hsu, Joshua Liberman, Ronald A. L\'opez, Evan Morris, Jacklyn Pezzato-Rovner, Jean-Baptiste Ruffio, Ben Sappey, Tobias Schofield, An…

The watery atmosphere of HD~209458~b revealed by joint $K$- and $L$-band high-resolution spectroscopy
We present a joint analysis of high-resolution $K$- and $L$-band observations of the benchmark hot Jupiter \hdb\ from the Keck Planet Imager and Characterizer (KPIC). One half night of observations were obtained in each bandpass covering similar pre-eclipse phases. The two epochs were then jointly analyzed using our atmospheric retrieval pipeline based on \petit\ to constrain the atmospheric pressure-temperature profile and chemical composition. Consistent with recent results from \textit{JWST}…

Re-examination of the CO absorption line in the M87 nucleus
Norita Kawanaka, Hiroshi Nagai, Yutaka Fujita
https://arxiv.org/abs/2508.03015 https://arxiv.or…

Re-examination of the CO absorption line in the M87 nucleus
We analyzed the archival ALMA data of the nuclear region of M87 and evaluate the molecular gas content from the CO(2--1) absorption line. We found an enigmatic variability in the absorption line depth between two epochs separated by only two months. We reexamined the dataset used in the analysis and found that the bandpass calibration source within the same dataset also revealed a similar absorption line structure. Furthermore, we observed a rise in the system noise temperature spectrum. We con…

Binarity at LOw Metallicity (BLOeM): Pipeline-Determined Physical Properties of OB Stars
J. M. Bestenlehner, Paul A. Crowther, V. A. Bronner, S. Simon-Diaz, D. J. Lennon, J. Bodensteiner, N. Langer, P. Marchant, H. Sana, F. R. N. Schneider, T. Shenar
https://arxiv.org/abs/2506.00117

Binarity at LOw Metallicity (BLOeM): Pipeline-Determined Physical Properties of OB Stars
We aim to determine the physical properties of OB stars from the multi-epoch VLT/FLAMES BLOeM spectroscopic survey of the Small Magellanic Cloud. We apply a pipeline designed to analyse large spectroscopic samples of OB stars to the co-added, initial 9 epochs of the BLOeM survey, utilising grids of synthetic model spectra computed with the stellar atmosphere code FASTWIND. 69 OB stars are excluded from the analysis owing to disk emission or significant contamination by secondaries in SB2 binari…

This https://arxiv.org/abs/2411.07103 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

On a connection between total positivity and Bernoulli stopping problems
Consider the optimal stopping problem of maximising the expected payoff in a game where a nonnegative reward is granted upon stopping on a success in a sequence of independent Bernoulli trials. These Bernoulli stopping problems are characterised by a recurrence relation connecting the stopping and continuation payoffs. This recurrence is used to establish optimality of the myopic strategy under unimodal continuation payoffs. Further, by embedding the success epochs of the trials into a Markov c…

X-ray studies of PSR J1838$-$0655 and its wind nebula associated with HESS J1837$-$069 and 1LHAASO J1837$-$0654u
Minseo Park (Chungbuk National University), Jaegeun Park (Chungbuk National University), Chanho Kim (Chungbuk National University), Hongjun An (Chungbuk National University)
https://arxiv.org/abs/2508.07660

X-ray studies of PSR J1838$-$0655 and its wind nebula associated with HESS J1837$-$069 and 1LHAASO J1837$-$0654u
We analyzed X-ray data from Chandra, XMM-Newton, NICER, and NuSTAR to characterize the properties of the pulsar PSR J1838$-$0655 and its pulsar wind nebula (PWN) associated with HESS J1837$-$069. Based on 5.5 years of NICER monitoring, we detected a glitch around MJD 59300, characterized by a fractional frequency jump of approximately $2\times 10^{-6}$. We constructed semi-phase-coherent timing solutions for pre- and post-glitch epochs, allowing for phase alignment of multi-instrument data and …

This https://arxiv.org/abs/2408.04864 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

The evolving role of astrophysical modelling in dark matter halo relaxation response
We study the change in the radial distribution of dark matter within haloes in response to baryonic astrophysical processes in galaxies at different epochs, investigating the role of astrophysical modeling in cosmological hydrodynamic simulations in producing the response. We find that the linear quasi-adiabatic relaxation with additional dependence on the halo-centric distance provides a good description not only at $z=0$, but also at an earlier epoch ($z=1$) in the IllustrisTNG simulation sui…

Cascade Relaxation of the Gravitating Vacuum as a Generator of the Evolving Universe
V. N. Lukash (Astro Space Center, P. N. Lebedev Physical Institute, Russian Academy of Sciences, Russia), E. V. Mikheeva (Astro Space Center, P. N. Lebedev Physical Institute, Russian Academy of Sciences)
https://arxiv.org/abs/2506.03226

Cascade Relaxation of the Gravitating Vacuum as a Generator of the Evolving Universe
The cascade relaxation of a polarized vacuum in the expanding Universe is a chain of evolutionary epochs of decreasing its density with the exit of dominant fields (each in its own time) from the initial zero states to nonzero values, from the dominant scalar field in the early Universe to subsequent ones, including the $Λ$-term in the modern Universe. The cascade vacuum relaxation creates the entire observable cosmology from the Friedmann model with small perturbations of the metric with non-…

A Spectral Energy Distribution Variability Study of the Eclipsing AGN NGC 6814
L. K. Pothier-Bogoslowski, L. C. Gallo, A. G. Gonzalez, M. Z. Buhariwalla, J. M. Miller
https://arxiv.org/abs/2506.07212

A Spectral Energy Distribution Variability Study of the Eclipsing AGN NGC 6814
The local Seyfert 1.5 active galactic nucleus (AGN), NGC 6814, is known to exhibit complex variability, eclipses, and even changing-look behaviour. In this work, we utilize optical-to-X-ray data obtained over 10-years with the Neil Gehrels Swift Observatory to examine the short-term (i.e. daily) and long-term (yearly) variations in the spectral energy distribution (SED). This includes three epochs of high-cadence monitoring (2012, 2016, and 2022), as well as two single observations (2019 and 20…

Radioastron probing the fine structure of the flaring H2O maser in star-forming region G25.65 1.05
N. N. Shakhvorostova (Astro-Space Center of the P.N. Lebedev Physical Institute, Moscow, Russia), A. V. Alakoz (Astro-Space Center of the P.N. Lebedev Physical Institute, Moscow, Russia), I. E. Val'tts (Astro-Space Center of the P.N. Lebedev Physical Institute, Moscow, Russia), I. D. Litovchenko (Astro-Space Center of the P.N. Lebedev Physical Institute, Moscow, Russia)

Radioastron probing the fine structure of the flaring H2O maser in star-forming region G25.65+1.05
The paper describes a Space-VLBI observation of the 22 GHz H2O masers in the massive star-forming region G25.65+1.05, using the 10-m space antenna of Radioastron together with the ground-based VLBA array. Two observing epochs at the pre-flare and post-flare state of the maser source are presented. Leveraging the exceptional angular resolution provided by space-ground baselines along with the broad UV coverage from VLBA baselines, we gained a detailed perspective on the area associated with the …

Radio emission from flaring stars and brown dwarfs
K. Perger, B. Seli, K. Vida
https://arxiv.org/abs/2506.21169 https://arxiv.org/pdf…

Radio emission from flaring stars and brown dwarfs
Aims. With the aim to reveal the effects of the magnetic field to the multi-band activity of dwarf stars, we search for associated radio emission for an extensive list of 14 915 brown dwarfs and 15 124 flaring stars. Methods. We utilised the first and second epoch catalogues and radio maps from all three epochs of the VLASS, supplemented with X-ray catalogues based on observations by the ROSAT, eROSITA, and XMM-Newton space telescopes, and 2-minute cadence optical light curves from the TESS mis…

A portrait throughout perihelion of the NH$_2$-rich interstellar comet 2I/Borisov
Sophie E. Deam, Michele T. Bannister, Cyrielle Opitom, Matthew M. Knight, Ryan Ridden-Harper, Darryl Z. Seligman, Alan Fitzsimmons, Aur\'elie Guilbert-Lepoutre, Emmanuel Jehin, Laurent Jorda, Michael Marsset, Youssef Moulane, Philippe Rousselot, Pierre Vernazza, Bin Yang

A portrait throughout perihelion of the NH$_2$-rich interstellar comet 2I/Borisov
The interstellar comet 2I/Borisov is the first interstellar object where compositional characterisation was possible throughout its entire perihelion passage. We report all 16 epochs of a comprehensive optical observation campaign with ESO VLT's integral field spectrograph MUSE, spanning 126 days from 2019 November 14 to 2020 March 19. The spatial dust emission of 2I/Borisov was predominantly smooth, with no seasonal effect. A jet-like feature was consistently visible. The gas production morpho…

Comprehensive Radio Monitoring of the Black Hole X-ray Binary Swift J1727.8$-$1613 during its 2023$-$2024 Outburst
Andrew K. Hughes, Francesco Carotenuto, Thomas D. Russell, Alexandra J. Tetarenko, James C. A. Miller-Jones, Arash Bahramian, Joe S. Bright, Fraser J. Cowie, Rob Fender, Mark A. Gurwell, Jasvinderjit K. Khaulsay, Anastasia Kirby, Serena Jones, Elodie Lescure, Michael McCollough, Richard M. Plotkin, Ramprasad Rao, Saeqa D. Vrtilek, David R. A. Williams-Baldwin, Callan M. Wo…

Comprehensive Radio Monitoring of the Black Hole X-ray Binary Swift J1727.8$-$1613 during its 2023$-$2024 Outburst
This work presents comprehensive multi-frequency radio monitoring of the black hole low-mass X-ray binary Swift J1727.8$-$1613, which underwent its first recorded outburst after its discovery in August 2023. Through a considerable community effort, we have coalesced the data from multiple, distinct observing programs; the light curves include ${\sim} 10$ months and 197 epochs of monitoring from 7 radio facilities with observing frequencies ranging from (approximately) 0.3$-$230GHz. The primary …

oLIMpus: An Effective Model for Line Intensity Mapping Auto- and Cross- Power Spectra in Cosmic Dawn and Reionization
Sarah Libanore, Julian B. Munoz, Ely D. Kovetz
https://arxiv.org/abs/2507.15922

oLIMpus: An Effective Model for Line Intensity Mapping Auto- and Cross- Power Spectra in Cosmic Dawn and Reionization
Line-intensity mapping (LIM) is emerging as a powerful probe of the high-redshift Universe, with a growing number of LIM experiments targeting various spectral lines deep into the epochs of reionization and cosmic dawn. A key remaining challenge is the consistent and efficient modeling of the diverse emission lines and of the observables of different surveys. Here, we present oLIMpus, a fully analytical effective model to study LIM auto- and cross- power spectra. Our work builds on the 21-cm ef…

SHELLQs-JWST perspective on the intrinsic mass relation between supermassive black holes and their host galaxies at z > 6
John Silverman, Junyao Li, Xuheng Ding, Masafusa Onoue, Michael Strauss, Yoshiki Matsuoka, Takuma Izumi, Knud Jahnke, Tommaso Treu, Marta Volonteri, Camryn Phillips, Irham Andika, Kentaro Aoki, Junya Arita, Shunsuke Baba, Sarah Bosman, Anna-Christina Eilers, Xiaohui Fan, Seiji Fujimoto, Melanie Habouzit, Zoltan Haiman, Masatoshi Imanishi, Kohei Inayoshi, Kazushi …

SHELLQs-JWST perspective on the intrinsic mass relation between supermassive black holes and their host galaxies at z > 6
The relation between the masses of supermassive black holes (SMBHs) and their host galaxies encodes information on their mode of growth, especially at the earliest epochs. The James Webb Space Telescope (JWST) has opened such investigations by detecting the host galaxies of AGN and more luminous quasars within the first billion years of the universe (z > 6). Here, we evaluate the relation between the mass of SMBHs and the total stellar mass of their host galaxies using a sample of nine quasars …

Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of $\alpha$ Cen A. II. Binary Star Modeling, Planet and Exozodi Search, and Sensitivity Analysis
Aniket Sanghi, Charles Beichman, Dimitri Mawet, William O. Balmer, Nicolas Godoy, Laurent Pueyo, Anthony Boccaletti, Max Sommer, Alexis Bidot, Elodie Choquet, Pierre Kervella, Pierre-Olivier Lagage, Jarron Leisenring, Jorge Llop-Sayson, Michael Ressler, Kevin Wagner, Mark Wyatt

Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of $α$ Cen A. II. Binary Star Modeling, Planet and Exozodi Search, and Sensitivity Analysis
JWST observed our closest solar twin, $α$ Cen A, with the MIRI coronagraph in F1550C (15.5 $μ$m) at three distinct epochs between August 2024 and April 2025. For the first time with JWST, we demonstrate the application of reference star differential imaging to simultaneously subtract the coronagraphic image of a primary star and the point spread function (PSF) of its binary companion to conduct a deep search for exoplanets and dust emission. We achieve a typical 5$σ$ point source contrast se…

Validate the bright Gaia celestial reference frame with new VLBI astrometry of radio stars
Jingdong Zhang, Bo Zhang, Shuangjing Xu, Xiaofeng Mai
https://arxiv.org/abs/2506.18758

Validate the bright Gaia celestial reference frame with new VLBI astrometry of radio stars
There exist inconsistencies between the bright and faint Gaia Celestial Reference Frame 3 (Gaia-CRF3), which manifests as a systematic rotation and needs to be independently estimated then corrected in future data releases. We collected 64 radio stars with VLBI astrometry, of which 16 have new VLBI observations with reference epochs close to Gaia. We estimated the orientation and spin biases of the bright Gaia-CRF3 by comparing VLBI radio star astrometry with their Gaia DR3 counterparts. We als…

Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of $\alpha$ Cen A. I. Observations, Orbital and Physical Properties, and Exozodi Upper Limits
Charles Beichman, Aniket Sanghi, Dimitri Mawet, Pierre Kervella, Kevin Wagner, Billy Quarles, Jack J. Lissauer, Max Sommer, Mark Wyatt, Nicolas Godoy, William O. Balmer, Laurent Pueyo, Jorge Llop-Sayson, Jonathan Aguilar, Rachel Akeson, Ruslan Belikov, Anthony Boccaletti, Elodie Choquet, Edward Fomalont, Thomas Henning, De…

Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of $α$ Cen A. I. Observations, Orbital and Physical Properties, and Exozodi Upper Limits
We report on coronagraphic observations of the nearest solar-type star, $α$ Cen A, using the MIRI instrument on the James Webb Space Telescope. With three epochs of observation (August 2024, February 2025, and April 2025), we achieve a sensitivity sufficient to detect $T_{\rm eff}\approx$ 225-250 K (1-1.2 $R_{\rm Jup}$) planets between 1"-2" and exozodiacal dust emission at the level of $>$5-8$\times$ the brightness of our own zodiacal cloud. The lack of exozodiacal dust emission sets an unpre…

Analysis of Jet Dynamics and Collimation Characteristics of 0241 622 on Parsec Scales
Haitian Shang, Wei Zhao, Xiaoyu Hong, Xu-zhi Hu
https://arxiv.org/abs/2506.04661

Analysis of Jet Dynamics and Collimation Characteristics of 0241+622 on Parsec Scales
We conducted a detailed analysis of the jet structure and dynamics of the source 0241+622 on milliarcsecond (mas) scales. We stacked images from multiple epochs to better recover the crosssection of the jet. By analyzing the relationship between jet width and distance, we observed that the jet exhibits a parabolic shape from the core, spanning a region from 0.12 to 6.1 mas. This structure suggests the acceleration and collimation processes of the jet. Beyond 18 mas from the core, the jet adopts…

Replaced article(s) found for astro-ph.GA. https://arxiv.org/list/astro-ph.GA/new
[1/1]:
- EPOCHS VI: The Size and Shape Evolution of Galaxies since z ~ 8 with JWST Observations
Ormerod, Conselice, Adams, Harvey, Austin, Trussler, Ferreira, Caruana, Lucatelli, Li, Roper

The HST-Gaia Near-Infrared Astrometric Reference Frame near the Milky Way Galactic Center
Matthew W. Hosek Jr., Tuan Do, Gregory D. Martinez, Rebecca Lewis-Merrill, Andrea M. Ghez, Jessica R. Lu, Shoko Sakai, Jay Anderson
https://arxiv.org/abs/2506.19933

The HST-Gaia Near-Infrared Astrometric Reference Frame near the Milky Way Galactic Center
We present the first high-precision proper motion catalog, tied to the International Celestial Reference System (ICRS), of infrared astrometric reference stars within R $\leq$ 25" (1 pc) of the central supermassive black hole at the Galactic center (GC). This catalog contains $\sim$2,900 sources in a highly extinguished region that is inaccessible via Gaia. New astrometric measurements are extracted from HST observations (14 epochs, 2010 - 2023) and transformed into the ICRS using 40 stars in c…

Atomic hydrogen reservoirs in quiescent galaxies at z = 0.4
A. Bianchetti, G. Rodighiero, D. Donevski, F. Sinigaglia, E. Elson, M. Vaccari, A. Marasco, L. Bisigello, I. Prandoni, M. Baes, M. Glowacki, F. M. Maccagni, G. Lorenzon, I. Heywood
https://arxiv.org/abs/2507.16917

Atomic hydrogen reservoirs in quiescent galaxies at z = 0.4
Context. Based on Local Universe observations, quiescent galaxies (QGs) host lower to no HI compared to star-forming galaxies (SFGs), but no constraints have been derived so far at higher redshift (z>0.1). Understanding whether QGs can retain significant HI reservoirs at higher z is crucial to refine quenching and gas accretion models and to constrain overall star formation efficiency at different epochs. Aims. We aim to probe HI in candidate QGs at intermediate redshifts (z=0.36) and to unders…