The Astrophysical Journal (Jan 2023)

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

  • 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 Alexander,
  • 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

DOI
https://doi.org/10.3847/1538-4357/ad09b2
Journal volume & issue
Vol. 960, no. 1
p. 34

Abstract

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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.

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