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• W3099522057 endingPage "171" @default.
• W3099522057 startingPage "171" @default.
• W3099522057 abstract "The equivalent widths of MgII absorption in the circumgalactic medium (CGM) trace the global star formation rate up to $z<6$, are larger for star-forming galaxies than passively-evolving galaxies, and decrease with increasing distance from the galaxy. We delve further into the physics involved by investigating gas kinematics and cloud column density distributions as a function of galaxy color, redshift, and projected distance from the galaxy (normalized by galaxy virial radius, $D/R_{rm vir}$). For 39 isolated galaxies at $0.3<z_{rm gal}<1.0$, we have detected MgII absorption in high-resolution ($Delta vsimeq 6.6$ km/s) spectra of background quasars within a projected distance of $7<D<190$ kpc. We characterize the absorption velocity spread using pixel-velocity two-point correlation functions. Velocity dispersions and cloud column densities for blue galaxies do not differ with redshift nor with $D/R_{rm vir}$. This suggests that outflows continually replenish the CGM of blue galaxies with high velocity dispersion, large column density gas out to large distances. Conversely, absorption hosted by red galaxies evolves with redshift where the velocity dispersions (column densities) are smaller (larger) at $z_{rm gal}<0.656$. After taking into account larger possible velocities in more massive galaxies, we find that there is no difference in the velocity dispersions or column densities for absorption hosted by red galaxies with $D/R_{rm vir}$. Thus, a lack of outflows in red galaxies causes the CGM to become more quiescent over time, with lower velocity dispersions and larger column densities towards lower $z_{rm gal}$. The quenching of star formation appears to affect the CGM out to $D/R_{rm vir}=0.75$." @default.
• W3099522057 created "2020-11-23" @default.
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• W3099522057 date "2016-02-18" @default.
• W3099522057 modified "2023-09-25" @default.
• W3099522057 title "MAGiiCAT IV. KINEMATICS OF THE CIRCUMGALACTIC MEDIUM AND EVIDENCE FOR QUIESCENT EVOLUTION AROUND RED GALAXIES" @default.
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• W3099522057 doi "https://doi.org/10.3847/0004-637x/818/2/171" @default.
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