Kavli Affiliate: Linhua Jiang
| First 5 Authors: Siwei Zou, Linhua Jiang, Zheng Cai, John Moustakas, Zechang Sun
| Summary:
We present the first result in exploring the gaseous halo and galaxy
correlation using the Dark Energy Spectroscopic Instrument (DESI) survey
validation data in the Cosmic Evolution Survey (COSMOS) and Hyper Suprime-Cam
(HSC) field. We obtain the multiphase gaseous halo properties in the
circumgalactic medium (CGM) by using 115 quasar spectra (S/N > 3). We detect
MgII absorption at redshift 0.6 < z < 2.5, CIV absorption at 1.6 < z < 3.6, and
HI absorption associated with the MgII and CIV. By cross-matching the
COSMOS2020 catalog, we identify the MgII and CIV host galaxies in ten quasar
fields at 0.9 < z < 3.1. We find that within the impact parameter of 250 kpc, a
tight correlation is seen between strong MgII equivalent width and the host
galaxy star formation rate. The covering fraction fc of strong MgII selected
galaxies, which is the ratio of 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 fc increase in the main-sequence galaxies likely suggests the
co-evolution of strong MgII absorbing gas and the main-sequence galaxies at the
cosmic noon. Furthermore, several MgII and CIV 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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