COSMOS Spectroscopic Redshift Compilation (First Data Release): 488,000 Redshifts Encompassing Two Decades of Spectroscopy
Abstract We present the COSMOS Spectroscopic Redshift Compilation encompassing ∼20 yr of spectroscopic redshifts within a 10 deg 2 area centered on the 2 deg 2 COSMOS legacy field. This compilation contains 487,666 redshifts of 266,284 unique objects from 138 individual programs up to z ∼ 8 with median stellar mass ∼10 8.4 –10 10 M ⊙ (redshift dependent). Rest-frame NUVrJ colors and star formation rate–stellar mass correlations show that the compilation primarily contains low-to-intermediate-mass star-forming and massive, quiescent galaxies at z < 1.25 and mostly low-mass bursty star-forming galaxies at z > 2. Sources in the compilation cover a diverse range of environments, including protoclusters such as “Hyperion.” The full compilation is 50% spectroscopically complete by i ∼ 23.4 mag and K s ∼ 21.6 mag; however, this is redshift dependent. Spatially, the compilation is >50% (>30%) complete within the central (outer) region limited to i < 24 mag and K s < 22.5 mag, separately. We demonstrate how the compilation can be used to validate photometric redshifts and investigate calibration metrics. By training self-organizing maps on COSMOS2020/Classic and projecting the compilation onto it, we find key subpopulations currently lacking spectroscopic coverage, including z < 1 intermediate-mass quiescent and low-/intermediate-mass bursty star-forming galaxies, z ∼ 2 massive quiescent galaxies, and z > 3 massive star-forming galaxies. This highlights how combining self-organizing maps with our compilation can provide guidance for future spectroscopic observations to get a complete spectroscopic view of galaxy populations. Lastly, the compilation will undergo periodic data releases incorporating new spectroscopic redshifts and providing a lasting legacy resource for the community.
Authors
- Masato Onodera (ORCID: https://orcid.org/0000-0003-3228-7264)
- L. Tasca (ORCID: https://orcid.org/0000-0001-8560-5073)
- Ali Ahmad Khostovan (ORCID: https://orcid.org/0000-0002-0101-336X)
- M. Vaccari (ORCID: https://orcid.org/0000-0002-6748-0577)
- Francesco Valentino (ORCID: https://orcid.org/0000-0001-6477-4011)
- D. B. Sanders (ORCID: https://orcid.org/0000-0002-1233-9998)
- S. J. Lilly (ORCID: https://orcid.org/0000-0002-6423-3597)
- Santosh Harish (ORCID: https://orcid.org/0000-0003-0129-2079)
- Malte Brinch (ORCID: https://orcid.org/0000-0002-0245-6365)
- Khee‐Gan Lee (ORCID: https://orcid.org/0000-0001-9299-5719)
- G. Gozaliasl (ORCID: https://orcid.org/0000-0002-0236-919X)
- Shuowen Jin
- Sina Taamoli (ORCID: https://orcid.org/0000-0003-0749-4667)
- J. D. Silverman (ORCID: https://orcid.org/0000-0002-0000-6977)
- Jorge A. Zavala (ORCID: https://orcid.org/0000-0002-7051-1100)
- Ekta A. Shah (ORCID: https://orcid.org/0000-0001-7811-9042)
- Brittany N. Vanderhoof (ORCID: https://orcid.org/0000-0002-8163-0172)
- A. Iovino (ORCID: https://orcid.org/0000-0001-6958-0304)
- Tohru Nagao (ORCID: https://orcid.org/0000-0002-7402-5441)
- Min S. Yun (ORCID: https://orcid.org/0000-0001-7095-7543)
- M. Salvato (ORCID: https://orcid.org/0000-0001-7116-9303)
- Nicole E. Drakos (ORCID: https://orcid.org/0000-0003-4761-2197)
- Masayuki Tanaka (ORCID: https://orcid.org/0000-0002-5011-5178)
- Anton M. Koekemoer (ORCID: https://orcid.org/0000-0002-6610-2048)
- Bahram Mobasher (ORCID: https://orcid.org/0000-0001-5846-4404)
- G. Hasinger (ORCID: https://orcid.org/0000-0002-0797-0646)
- Benny Trakhtenbrot (ORCID: https://orcid.org/0000-0002-3683-7297)
- Zahra Sattari (ORCID: https://orcid.org/0000-0002-0364-1159)
- John R. Weaver (ORCID: https://orcid.org/0000-0003-1614-196X)
- Caitlin M. Casey (ORCID: https://orcid.org/0000-0002-0930-6466)
- O. Ilbert (ORCID: https://orcid.org/0000-0002-7303-4397)
- N. Suzuki (ORCID: https://orcid.org/0000-0001-7266-930X)
- Jacqueline Antwi-Danso (ORCID: https://orcid.org/0000-0002-0243-6575)
- Antonello Calabrò (ORCID: https://orcid.org/0000-0003-2536-1614)
- N. Z. Scoville (ORCID: https://orcid.org/0000-0002-0438-3323)
- Olivia R. Cooper (ORCID: https://orcid.org/0000-0003-3881-1397)
- Daniel Masters (ORCID: https://orcid.org/0000-0001-5382-6138)
- Hiddo Algera (ORCID: https://orcid.org/0000-0002-4205-9567)
- Jitrapon Lertprasertpong (ORCID: https://orcid.org/0000-0002-3535-4066)
- Jonathan R. Trump (ORCID: https://orcid.org/0000-0002-1410-0470)
- Behnam Darvish (ORCID: https://orcid.org/0000-0003-4919-9017)
- Ronaldo Laishram (ORCID: https://orcid.org/0000-0002-0322-6131)
- Daichi Kashino (ORCID: https://orcid.org/0000-0001-9044-1747)
- P. Capak (ORCID: https://orcid.org/0000-0003-3578-6843)
- Nima Chartab (ORCID: https://orcid.org/0000-0003-3691-937X)
- Sune Toft (ORCID: https://orcid.org/0000-0003-3631-7176)
- M. Brusa (ORCID: https://orcid.org/0000-0002-5059-6848)
- Isabella G. Cox (ORCID: https://orcid.org/0000-0002-1803-794X)
- Jeyhan S. Kartaltepe (ORCID: https://orcid.org/0000-0001-9187-3605)
- Andrew Battisti (ORCID: https://orcid.org/0000-0003-4569-2285)
- Daizhong Liu (ORCID: https://orcid.org/0000-0001-9773-7479)
- Andreas L. Faisst (ORCID: https://orcid.org/0000-0002-9382-9832)
- Ryan L. Sanders (ORCID: https://orcid.org/0000-0003-4792-9119)
- Greta Toni (ORCID: https://orcid.org/0009-0005-3133-1157)
- Yingjie Peng (ORCID: https://orcid.org/0000-0003-0939-9671)
- Hossein Hatamnia (ORCID: https://orcid.org/0009-0007-3673-4523)
- Matthew R. George
Publication Details
- Journal
- The Astrophysical Journal Supplement Series
- Published
- 2025-12-18
- DOI
- https://doi.org/10.3847/1538-4365/ae1cb9
- Citations
- 9
- Primary Topic
- Galaxies: Formation, Evolution, Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 10.39