Day 474

Friday.

1307.6553
The dependence of galactic outflows on the proeprties and orientation of zCOSMOS galaxies at z~1
Bordoloi, Lilly, ..., Kneib, LeFevre, et al

Analysis of cool outflowing gas around galaxies, traced by MgII absorption lines in the co-added spectra of a sample of 486 zCOSMOS galaxies at 1<z<1.5.  These galaxies span a range of stellar masses 9.45<log(M*/Msun)<10.7 and SFR 0.14<log(SFR/Msun/yr)<2.35.  Identify the cool outflowing component in the MgII absorption and find that the equivalent width of the outflowing component increases with stellar mass.  The outflow equivalent width also increases steadily with the increasing SFR of the galaxies.  At similar stellar masses, the blue galaxies exhibit a significantly higher outflow EW as compared to red galaxies.  The outflow EW is higher for the face-on systems as compared to edge-on ones, indicating that for the disk galaxies, the outflowing gas is primarily bipolar in geometry.  Galaxies typically exhibit outflow velocities ranging from -200 km/s to -300 km/s and on average the face-on galaxies exhibit higher outflow velocity as compared to the edge-on ones.  Galaxies with irregular morphologies exhibit outflow EW as well as outflow velocities comparable to face on disk galaxies.  These galaxies exhibit minimum mass outflow rates > 5-7 Msun/yr and a mass loading factor /eta = dMout/ dt /SFR comparable to the SFRs of the galaxies.