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#cosmosweb

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Flipboard Science Desk

The largest James Webb Space Telescope (JWST) observing program has finalized its release of what it discovered in the area it mapped — 780,000 galaxies. Big Think's resident astrophysicist, Ethan Siegel, breaks down what that might mean.

flip.it/Y3jIYi

Big Think780,000 galaxies revealed in JWST's largest science operationThe COSMOS-Web has just finalized their release of their full field: larger and deeper than any other JWST program. Here's what's inside.
#Science#Astrophysics#Space
Daniel Fischer

COSMOS2025 - The COSMOS-Web galaxy catalog of photometry, morphology, redshifts, and physical parameters from JWST, HST, and ground-based imaging: arxiv.org/abs/2506.03243 -> #COSMOSWeb Unveils Largest Look Ever Into the Deep Universe: cosmos.astro.caltech.edu/news/ -> thread bsky.app/profile/did:plc:jffd7 with more links.

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arXiv.orgCOSMOS2025: The COSMOS-Web galaxy catalog of photometry, morphology, redshifts, and physical parameters from JWST, HST, and ground-based imagingWe present COSMOS2025, the COSMOS-Web catalog of photometry, morphology, photometric redshifts and physical parameters for more than 700,000 galaxies in the Cosmic Evolution Survey (COSMOS) field. This catalog is based on our \textit{James Webb Space Telescope} 255\,h COSMOS-Web program, which provides deep near-infrared imaging in four NIRCam (F115W, F150W, F277W, F444W) and one MIRI (F770W) filter over the central $\sim 0.54 {\, \rm deg}^2$ ($\sim 0.2 {\, \rm deg}^2$ for MIRI) in COSMOS. These data are combined with ground- and space-based data to derive photometric measurements of NIRCam-detected sources using both fixed-aperture photometry (on the space-based bands) and a profile-fitting technique on all 37 bands spanning 0.3-8 micron. We provide morphology for all sources from complementary techniques including profile fitting and machine-learning classification. We derive photometric redshifts, physical parameters and non-parametric star formation histories from spectral energy distribution (SED) fitting. The catalog has been extensively validated against previous COSMOS catalogs and other surveys. Photometric redshift accuracy measured using spectroscopically confirmed galaxies out to $z\sim9$ reaches $σ_{\rm MAD} = 0.012$ at $m_{\rm F444W}<28$ and remains at $σ_{\rm MAD} \lesssim 0.03$ as a function of magnitude, color, and galaxy type. This represents a factor of $\sim 2$ improvement at 26 AB mag compared to COSMOS2020. The catalog is approximately 80\% complete at $\log(M_{\star}/{\rm M}_{\odot}) \sim 9$ at $z \sim 10$ and at $\log(M_{\star}/{\rm M}_{\odot}) \sim 7$ at $z \sim 0.2$, representing a gain of 1\,dex compared to COSMOS2020. COSMOS2025 represents the definitive COSMOS-Web catalog. It is provided with complete documentation, together with redshift probability distributions, and it is ready for scientific exploitation today.
RTN

#UniHeidelberg:
"
Daten des James Webb Space Telescope enthüllen frühe Strukturen im Universum
"
"Heidelberger Astrophysiker erstellt in internationaler Zusammenarbeit bislang „tiefsten“ Katalog von Galaxiengruppen"

uni-heidelberg.de/de/newsroom/

19.5.2025

www.uni-heidelberg.deDaten des James Webb Space Telescope enthüllen frühe Strukturen im Universum
#Astronomie#COSMOSWeb#JWST
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