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DESI Survey Validation Data in the COSMOS/Hyper Suprime-Cam Field: Cool Gas Trace Main-sequence Star-forming Galaxies at the Cosmic Noon

Zou, Siwei; Jiang, Linhua; Cai, Zheng; Moustakas, John; Sun, Zechang; Pan, Zhiwei; Ding, Jiani; Forero-Romero, Jaime E.; Zou, Hu; Ting, Yuan-sen; Pieri, Matthew; Ahlen, Steven; Alexander, David; Brooks, David; Dey, Arjun; Font-Ribera, Andreu; Gontcho A. Gontcho, Satya; Honscheid, Klaus; Landriau, Martin; de la Macorra, Axel; Vargas Magana, Mariana; Meisner, Aaron; Miquel, Ramon; Schubnell, Michael; Tarlé, Gregory; Zhou, Zhimin

DESI Survey Validation Data in the COSMOS/Hyper Suprime-Cam Field: Cool Gas Trace Main-sequence Star-forming Galaxies at the Cosmic Noon Thumbnail


Siwei Zou

Linhua Jiang

Zheng Cai

John Moustakas

Zechang Sun

Zhiwei Pan

Jiani Ding

Jaime E. Forero-Romero

Hu Zou

Yuan-sen Ting

Matthew Pieri

Steven Ahlen

David Brooks

Arjun Dey

Andreu Font-Ribera

Satya Gontcho A. Gontcho

Klaus Honscheid

Martin Landriau

Axel de la Macorra

Mariana Vargas Magana

Aaron Meisner

Ramon Miquel

Michael Schubnell

Gregory Tarlé

Zhimin Zhou


We present the first result in exploring the gaseous halo and galaxy correlation using the Dark Energy Spectroscopic Instrument survey validation data in the Cosmic Evolution Survey (COSMOS) and Hyper Suprime-Cam field. We obtain multiphase gaseous halo properties in the circumgalactic medium by using 115 quasar spectra (signal-to-noise ratio > 3). We detect Mg ii absorption at redshift 0.6 < z < 2.5, C iv absorption at 1.6 < z < 3.6, and H i absorption associated with the Mg ii and C iv. By crossmatching the COSMOS2020 catalog, we identify the Mg ii and C iv host galaxies in 10 quasar fields at 0.9< z < 3.1. We find that within the impact parameter of 250 kpc, a tight correlation is seen between the strong Mg ii equivalent width and the host galaxy star formation rate. The covering fraction f c of the strong Mg ii selected galaxies, which is the ratio of the absorbing galaxy in a certain galaxy population, shows significant evolution in the main-sequence galaxies and marginal evolution in all the galaxy populations within 250 kpc at 0.9 < z < 2.2. The f c increase in the main-sequence galaxies likely suggests the coevolution of strong Mg ii absorbing gas and the main-sequence galaxies at the cosmic noon. Furthermore, Mg ii and C iv absorbing gas is detected out of the galaxy virial radius, tentatively indicating the feedback produced by the star formation and/or the environmental effects.

Journal Article Type Article
Acceptance Date Nov 3, 2023
Online Publication Date Dec 20, 2023
Publication Date Jan 1, 2024
Deposit Date Jan 2, 2024
Publicly Available Date Jan 2, 2024
Journal The Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 960
Issue 1
Article Number 34
Keywords Circumgalactic medium, Quasar absorption line spectroscopy, Galaxy environments, Star formation
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