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- W3127081719 endingPage "4761" @default.
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- W3127081719 abstract "We present a survey of MgII absorbing gas in the vicinity of 380 random galaxies, using 156 background quasi-stellar objects(QSOs) as absorption-line probes. The sample comprises 211 isolated (73 quiescent and 138 star-forming galaxies) and 43 non-isolated galaxies with sensitive constraints for both MgII absorption and Ha emission. The projected distances span a range from d=9 to 497 kpc, redshifts of the galaxies range from z=0.10 to 0.48, and rest-frame absolute B-band magnitudes range from $M_{rm B}=-16.7$ to $-22.8$. Our analysis shows that the rest-frame equivalent width of MgII, $W_r$(2796), depends on halo radius($R_h$), $B$-band luminosity($L_{rm B}$) and stellar mass ($M_{rm star}$) of the host galaxies, and declines steeply with increasing $d$ for isolated, star-forming galaxies. $W_r$(2796) exhibits no clear trend for either isolated, quiescent galaxies or non-isolated galaxies. The covering fraction of MgII absorbing gas $langle kappa rangle$ is high with $langle kappa ranglegtrsim 60$% at $<40$ kpc for isolated galaxies and declines rapidly to $langle kappa rangleapprox 0$ at $dgtrsim100$ kpc. Within the gaseous radius, $langle kappa rangle$ depends sensitively on both $M_{rm star}$ and the specific star formation rate inferred from Ha. Different from massive quiescent halos, the observed velocity dispersion of MgII gas around star-forming galaxies is consistent with expectations from virial motion, which constrains individual clump mass to $m_{rm cl} gtrsim 10^5 ,rm M_odot$ and cool gas accretion rate of $sim 0.7-2 ,M_odot,rm yr^{-1}$. We find no strong azimuthal dependence of MgII absorption for either star-forming or quiescent galaxies. Our results highlight the need of a homogeneous, absorption-blind sample for establishing a holistic description of chemically-enriched gas in the circumgalactic space." @default.
- W3127081719 created "2021-02-15" @default.
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- W3127081719 date "2021-02-10" @default.
- W3127081719 modified "2023-10-16" @default.
- W3127081719 title "A complete census of circumgalactic Mg <scp>ii</scp> at redshift <i>z</i> ≲ 0.5" @default.
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- W3127081719 doi "https://doi.org/10.1093/mnras/stab360" @default.
- W3127081719 hasPublicationYear "2021" @default.
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