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Date and Time of the Query: 2019-06-19 T20:52:25 PDT
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For refcode 2016ApJ...833..259B:
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2016ApJ...833..259B The Properties of the Circumgalactic Medium in Red and Blue Galaxies: Results from the COS-GASS+COS-Halos Surveys Borthakur, Sanchayeeta; Heckman, Timothy; Tumlinson, Jason; Bordoloi, Rongmon; Kauffmann, Guinevere; Catinella, Barbara; Schiminovich, David; Dave, Romeel; Moran, Sean M.; Saintonge, Amelie Abstract. We use the combined data from the COS-GASS and COS-Halos surveys to characterize the Circum-Galactic Medium (CGM) surrounding typical low-redshift galaxies in the mass range {M}_*_~ {10}^9.5-11.5^ {M}_sun_, and over a range of impact parameters extending to just beyond the halo virial radius (R_vir_). We find the radial scale length of the distributions of the equivalent widths of the Ly-{alpha} and Si III absorbers to be ~1 and ~0.4 R_vir_, respectively. The radial distribution of equivalent widths is relatively uniform for the blue galaxies, but highly patchy (i.e., it has a low covering fraction) for the red galaxies. We also find that the Ly-{alpha} and Si III equivalent widths show significant positive correlations with the specific star formation rate (sSFR) of the galaxy. We find a surprising lack of correlations between the halo mass (virial velocity) and either the velocity dispersions or velocity offsets of the Ly-{alpha} lines. The ratio of the velocity offset to the velocity dispersion for the Ly-{alpha} absorbers has a mean value of ~4, suggesting that a given line of sight is intersecting a dynamically coherent structure in the CGM, rather than a sea of orbiting clouds. The kinematic properties of the CGM are similar in the blue and red galaxies, although we find that a significantly larger fraction of the blue galaxies have large Ly-{alpha} velocity offsets (>200 km s^-1^). We show that---if the CGM clouds represent future fuel for star formation---our new results could imply a large drop in the sSFR across the galaxy mass-range we probe. Key words: galaxies: halos, galaxies: star formation, quasars: absorption lines
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