COSMOS Spectroscopic Redshift Compilation (First Data Release): 488k Redshifts Encompassing Two Decades of Spectroscopy
Ali Ahmad Khostovan, Jeyhan S. Kartaltepe, Mara Salvato, Olivier Ilbert, Caitlin M. Casey, Hiddo Algera, Jacqueline Antwi-Danso, Andrew Battisti, Malte Brinch, Marcella Brusa, Antonello Calabro, Peter L. Capak, Nima Chartab, Olivia R. Cooper, Isa G. Cox, Behnam Darvish

TL;DR
The COSMOS Spectroscopic Redshift Compilation provides a comprehensive dataset of nearly half a million redshifts over two decades, enabling detailed studies of galaxy evolution, environment, and calibration, and guiding future spectroscopic efforts.
Contribution
This paper presents the first data release of a large, diverse spectroscopic redshift compilation covering 20 years, with analysis tools for validation and identifying gaps in current coverage.
Findings
Contains 487,666 redshifts of 266,284 objects up to z~8
Identifies key galaxy subpopulations lacking spectroscopic coverage
Demonstrates use of self-organizing maps for calibration and future observation guidance
Abstract
We present the COSMOS Spectroscopic Redshift Compilation encompassing ~ 20 years of spectroscopic redshifts within a 10 deg area centered on the 2 deg COSMOS legacy field. This compilation contains 487,666 redshifts of 266,284 unique objects from 138 individual observing programs up to with median stellar mass to M (redshift dependent). Rest-frame colors and SFR -- stellar mass correlations show the compilation primarily contains low- to intermediate-mass star-forming and massive, quiescent galaxies at and mostly low-mass bursty star-forming galaxies at . Sources in the compilation cover a diverse range of environments, including protoclusters such as ``Hyperion''. The full compilation is 50\% spectroscopically complete by and mag; however, this is redshift dependent. Spatially,…
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Taxonomy
TopicsAstronomy and Astrophysical Research · Gamma-ray bursts and supernovae · Stellar, planetary, and galactic studies
