Tootfinder

Euclid's sight restored: #Euclid's optics has performed significantly better than hoped; after the very first mirror was warmed by just 34 degrees, Euclid's sight was restored. More technical details: https://www.euclid-ec.org/euclid-successfully-de-iced-gains-15-sensitivity/

Erfolgreich enteist: ESA-Weltraumteleskop Euclid wieder mit voller Sensitivität
Innerhalb von neun Monaten im All hat sich auf den Instrumenten des Weltraumteleskops Euclid eine dünne Eisschicht gebildet. Die wurde nun erfolgreich entfernt.

The altitudes of a triangle
Mark Mandelkern
https://arxiv.org/abs/2403.19670 https://arxiv.org/pdf/2403.19670

The altitudes of a triangle
A long-standing, unanswered question regarding Euclid's Elements concerns the absence of a theorem for the concurrence of the altitudes of a triangle, and the possible reasons for this omission. In the centuries following Euclid, a remarkable number of proofs have been put forward; this suggests a search for the most elementary and direct proof. This paper provides a simple, direct, elementary proof of the theorem; it is based solely on the Elements.

"Do you remember me, when the rain gathers? And do you still believe that nothing else matters for me"?
#assbachSingt

Reconnaissance ultracool spectra in the Euclid Deep Fields
Jerry Jun-Yan Zhang, Nicolas Lodieu, Eduardo Mart\'in
https://arxiv.org/abs/2403.15288 https…

Reconnaissance ultracool spectra in the Euclid Deep Fields
Context. Euclid will carry out a deep survey benefiting the discovery and characterisation of ultracool dwarfs (UCDs), especially in the Euclid Deep Fields (EDFs), which the telescope will scan repeatedly throughout its mission. The photometric and spectroscopic standards in the EDFs are important benchmarks, crucial for the classification and characterisation of new UCD discoveries and for the calibration of the mission itself. Aims. We aim to provide a list of photometric UCD candidates and c…

If only ESA would make their missions raw images (FITS) available as trivially and easily as NASA does.
#ESA #Euclid #JWST #NASA

Euclid preparation. Measuring detailed galaxy morphologies for Euclid with Machine Learning
Euclid Collaboration, et al.
https://arxiv.org/abs/2402.10187 h…

Euclid preparation. Measuring detailed galaxy morphologies for Euclid with Machine Learning
The Euclid mission is expected to image millions of galaxies with high resolution, providing an extensive dataset to study galaxy evolution. We investigate the application of deep learning to predict the detailed morphologies of galaxies in Euclid using Zoobot a convolutional neural network pretrained with 450000 galaxies from the Galaxy Zoo project. We adapted Zoobot for emulated Euclid images, generated based on Hubble Space Telescope COSMOS images, and with labels provided by volunteers in t…

An Update today about the latest #Euclid crisis in https://twitter.com/esa/status/1770580011910676711: "first results just announced confirm successful operations, Euclid's sharp vision is restored. The initial analysis of Euclid’s data validates the de-icing approach devised by the team."

Euclid preparation. XLII. A unified catalogue-level reanalysis of weak lensing by galaxy clusters in five imaging surveys
Euclid Collaboration, M. Sereno, S. Farrens, L. Ingoglia, G. F. Lesci, L. Baumont, G. Covone, C. Giocoli, F. Marulli, S. Miranda La Hera, M. Vannier, A. Biviano, S. Maurogordato, L. Moscardini, N. Aghanim, S. Andreon, N. Auricchio, M. Baldi, S. Bardelli, F. Bellagamba, C. Bodendorf, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann, S. Camera, V. Capobianco, C. Car…

Euclid preparation. XLII. A unified catalogue-level reanalysis of weak lensing by galaxy clusters in five imaging surveys
Precise and accurate mass calibration is required to exploit galaxy clusters as astrophysical and cosmological probes in the Euclid era. Systematic errors in lensing signals by galaxy clusters can be empirically estimated by comparing different surveys with independent and uncorrelated systematics. To assess the robustness of the lensing results to systematic errors, we carried out end-to-end tests across different data sets. We performed a unified analysis at the catalogue level by leveraging …

This https://arxiv.org/abs/2403.15288 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Reconnaissance ultracool spectra in the Euclid Deep Fields
Context. Euclid will carry out a deep survey benefiting the discovery and characterisation of ultracool dwarfs (UCDs), especially in the Euclid Deep Fields (EDFs), which the telescope will scan repeatedly throughout its mission. The photometric and spectroscopic standards in the EDFs are important benchmarks, crucial for the classification and characterisation of new UCD discoveries and for the calibration of the mission itself. Aims. We aim to provide a list of photometric UCD candidates and c…

Euclid preparation. Measuring detailed galaxy morphologies for Euclid with Machine Learning
Euclid Collaboration, et al.
https://arxiv.org/abs/2402.10187 h…

Euclid preparation. Measuring detailed galaxy morphologies for Euclid with Machine Learning
The Euclid mission is expected to image millions of galaxies with high resolution, providing an extensive dataset to study galaxy evolution. We investigate the application of deep learning to predict the detailed morphologies of galaxies in Euclid using Zoobot a convolutional neural network pretrained with 450000 galaxies from the Galaxy Zoo project. We adapted Zoobot for emulated Euclid images, generated based on Hubble Space Telescope COSMOS images, and with labels provided by volunteers in t…

Euclid preparation. XLII. A unified catalogue-level reanalysis of weak lensing by galaxy clusters in five imaging surveys
Euclid Collaboration, M. Sereno, S. Farrens, L. Ingoglia, G. F. Lesci, L. Baumont, G. Covone, C. Giocoli, F. Marulli, S. Miranda La Hera, M. Vannier, A. Biviano, S. Maurogordato, L. Moscardini, N. Aghanim, S. Andreon, N. Auricchio, M. Baldi, S. Bardelli, F. Bellagamba, C. Bodendorf, D. Bonino, E. Branchini, M. Brescia, J. Brinchmann, S. Camera, V. Capobianco, C. Car…

Euclid preparation. XLII. A unified catalogue-level reanalysis of weak lensing by galaxy clusters in five imaging surveys
Precise and accurate mass calibration is required to exploit galaxy clusters as astrophysical and cosmological probes in the Euclid era. Systematic errors in lensing signals by galaxy clusters can be empirically estimated by comparing different surveys with independent and uncorrelated systematics. To assess the robustness of the lensing results to systematic errors, we carried out end-to-end tests across different data sets. We performed a unified analysis at the catalogue level by leveraging …

A Model for the Redshift-Space Galaxy 4-Point Correlation Function
William Ortol\'a Leonard, Zachary Slepian, Jiamin Hou
https://arxiv.org/abs/2402.15510

A Model for the Redshift-Space Galaxy 4-Point Correlation Function
The field of cosmology is entering an epoch of unparalleled wealth of observational data thanks to galaxy surveys such as DESI, Euclid, and Roman. Therefore, it is essential to have a firm theoretical basis that allows the effective analysis of the data. With this purpose, we compute the nonlinear, gravitationally-induced connected galaxy 4-point correlation function (4PCF) at the tree level in Standard Perturbation Theory (SPT), including redshift-space distortions (RSD). We begin from the tri…

Euclid view of dusty star forming galaxies at z>~1.5 detected in wide area submillimetre surveys
Dipanjan Mitra, Mattia Negrello, Gianfranco De Zotti, Zhen-Yi Cai
https://arxiv.org/abs/2404.11551

Euclid view of dusty star forming galaxies at z>~1.5 detected in wide area submillimetre surveys
We investigate the constraints provided by the Euclid space observatory on the physical properties of dusty star forming galaxies (DSFGs) at z>~1.5 detected in wide area sub millimetre surveys with Herschel. We adopt a physical model for the high z progenitors of spheroidal galaxies, which form the bulk of the DSFGs at z>~1.5. We improve the model by combining the output of the equations of the model with a formalism for the spectral energy distribution(SED). After optimising the SED parameters…

This https://arxiv.org/abs/2301.02986 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Forklens: Accurate weak-lensing shear measurement with deep learning
Weak gravitational lensing is one of the most important probes of the nature of dark matter and dark energy. In order to extract cosmological information from next-generation weak lensing surveys (e.g., Euclid, Roman, LSST, and CSST) as much as possible, accurate measurements of weak lensing shear are required. There are existing algorithms to measure the weak lensing shear on imaging data, which have been successfully applied in previous surveys. In the meantime, machine learning (ML) has been…

This https://arxiv.org/abs/2311.01465 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Euclid preparation. XXXIX. The effect of baryons on the Halo Mass Function
The Euclid photometric survey of galaxy clusters stands as a powerful cosmological tool, with the capacity to significantly propel our understanding of the Universe. Despite being sub-dominant to dark matter and dark energy, the baryonic component in our Universe holds substantial influence over the structure and mass of galaxy clusters. This paper presents a novel model to precisely quantify the impact of baryons on galaxy cluster virial halo masses, using the baryon fraction within a cluster …

This https://arxiv.org/abs/2311.01465 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Euclid preparation. XXXIX. The effect of baryons on the Halo Mass Function
The Euclid photometric survey of galaxy clusters stands as a powerful cosmological tool, with the capacity to significantly propel our understanding of the Universe. Despite being sub-dominant to dark matter and dark energy, the baryonic component in our Universe holds substantial influence over the structure and mass of galaxy clusters. This paper presents a novel model to precisely quantify the impact of baryons on galaxy cluster virial halo masses, using the baryon fraction within a cluster …

Probing the dark matter haloes of external galaxies with stellar streams
Madison Walder, Denis Erkal, Michelle Collins, David Martinez-Delgado
https://arxiv.org/abs/2402.13314

Probing the dark matter haloes of external galaxies with stellar streams
Stellar streams have proven to be powerful tools for measuring the Milky Way's gravitational potential and hence its dark matter halo. In the coming years, Vera Rubin, Euclid, ARRAKIHS, and NGRST will uncover a plethora of streams around external galaxies. Although great in number, observations of these distant streams will often be limited to only the on-sky position of the stream. In this work, we explore how well we will be able to measure the dark matter haloes of these galaxies by fitting …

This https://arxiv.org/abs/2309.00052 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

Euclid preparation. XXXIV. The effect of linear redshift-space distortions in photometric galaxy clustering and its cross-correlation with cosmic shear
The cosmological surveys that are planned for the current decade will provide us with unparalleled observations of the distribution of galaxies on cosmic scales, by means of which we can probe the underlying large-scale structure (LSS) of the Universe. This will allow us to test the concordance cosmological model and its extensions. However, precision pushes us to high levels of accuracy in the theoretical modelling of the LSS observables, so that no biases are introduced into the estimation of…

Probing the dark matter haloes of external galaxies with stellar streams
Madison Walder, Denis Erkal, Michelle Collins, David Martinez-Delgado
https://arxiv.org/abs/2402.13314

Probing the dark matter haloes of external galaxies with stellar streams
Stellar streams have proven to be powerful tools for measuring the Milky Way's gravitational potential and hence its dark matter halo. In the coming years, Vera Rubin, Euclid, ARRAKIHS, and NGRST will uncover a plethora of streams around external galaxies. Although great in number, observations of these distant streams will often be limited to only the on-sky position of the stream. In this work, we explore how well we will be able to measure the dark matter haloes of these galaxies by fitting …

This https://arxiv.org/abs/2402.15510 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

A Model for the Redshift-Space Galaxy 4-Point Correlation Function
The field of cosmology is entering an epoch of unparalleled wealth of observational data thanks to galaxy surveys such as DESI, Euclid, and Roman. Therefore, it is essential to have a firm theoretical basis that allows the effective analysis of the data. With this purpose, we compute the nonlinear, gravitationally-induced connected galaxy 4-point correlation function (4PCF) at the tree level in Standard Perturbation Theory (SPT), including redshift-space distortions (RSD). We begin from the tri…

This https://arxiv.org/abs/2402.04800 has been replaced.
link: https://scholar.google.com/scholar?q=a

Euclid: Identifying the reddest high-redshift galaxies in the Euclid Deep Fields with gradient-boosted trees
Dusty, distant, massive ($M_*\gtrsim 10^{11}\,\rm M_\odot$) galaxies are usually found to show a remarkable star-formation activity, contributing on the order of $25\%$ of the cosmic star-formation rate density at $z\approx3$--$5$, and up to $30\%$ at $z\sim7$ from ALMA observations. Nonetheless, they are elusive in classical optical surveys, and current near-infrared surveys are able to detect them only in very small sky areas. Since these objects have low space densities, deep and wide survey…

This https://arxiv.org/abs/2311.07455 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_…

A Bayesian Approach to Strong Lens Finding in the Era of Wide-area Surveys
The arrival of the Vera C. Rubin Observatory's Legacy Survey of Space and Time (LSST), Euclid-Wide and Roman wide area sensitive surveys will herald a new era in strong lens science in which the number of strong lenses known is expected to rise from $\mathcal{O}(10^3)$ to $\mathcal{O}(10^5)$. However, current lens-finding methods still require time-consuming follow-up visual inspection by strong-lens experts to remove false positives which is only set to increase with these surveys. In this wor…

This https://arxiv.org/abs/2203.12582 has been replaced.
link: https://scholar.google.com/scholar?q=a

Qualitative probe of interacting dark energy with redshift-space distortions
The imprint of interacting dark energy (IDE) needs to be correctly identified in order to avoid bias in constraints on IDE. This paper investigates the large-scale imprint of IDE in redshift space distortions, using $Euclid$-like photometric prescriptions. A first attempt at incorporating the IDE dynamics in the galaxy (clustering and evolution) biases is made. Without IDE dynamics taken into account in the galaxy biases, as is conventionally done, the results suggest that for a constant dark e…

Assembly bias in eBOSS
R. Paviot, A. Rocher, S. Codis, A. de Mattia, E. Jullo, S. de la Torre
https://arxiv.org/abs/2402.07715 https://

Assembly bias in eBOSS
Analytical models of galaxy-halo connection such as the Halo Occupation Distribution (HOD) model have been widely used over the past decades as a means to intensively test perturbative models on quasi-linear scales. However, these models fail to reproduce the galaxy-galaxy lensing signal on non-linear scales, over-predicting the observed signal up to 40%. With ongoing Stage-IV galaxy surveys such as DESI and EUCLID, it is now crucial to accurately model the galaxy-halo connection up to intra-ha…

Uncovering Tidal Treasures: Automated Classification of Faint Tidal Features in DECaLS Data
Alexander J. Gordon, Annette M. N. Ferguson, Robert G. Mann
https://arxiv.org/abs/2404.06487

Uncovering Tidal Treasures: Automated Classification of Faint Tidal Features in DECaLS Data
Tidal features are a key observable prediction of the hierarchical model of galaxy formation and contain a wealth of information about the properties and history of a galaxy. Modern wide-field surveys such as LSST and Euclid will revolutionise the study of tidal features. However, the volume of data will far surpass the capacity to inspect each galaxy to identify the feature visually, thereby motivating an urgent need to develop automated detection methods. This paper presents a visual classifi…