Radial And Azimuthal Profiles Of Mg II Absorption Around Galaxies At 0.5 < Z < 0.7

Details Radial And Azimuthal Profiles Of Mg II Absorption Around Galaxies At 0.5 < Z < 0.7 Radial And Azimuthal Profiles Of Mg II Absorption Around Galaxies At 0.5 < Z < 0.7

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21930403b&link_type=abstract

American Astronomical Society, AAS Meeting #219, #304.03

Astronomy and Astrophysics

Astronomy

Scientific paper

We map the 2-D distribution of Mg II gas within 200 kpc (physical) of regular galaxies at redshifts 0.5 < z < 0.9 using co-added spectra from background galaxies at z > 1. We focus on the variation of Mg II rest frame equivalent width as a function of impact parameter for different subsets of foreground galaxies in terms of their rest frame colors and masses. The Mg II radial profiles can be characterized by a power law with an exponential cutoff. Blue galaxies have high average Mg II equivalent width as compared to red galaxies at close impact parameters. Blue galaxies also exhibit a correlation between Mg II equivalent width and galactic stellar mass. There is strong azimuthal dependence of the Mg II absorption around inclined disk galaxies. Absorption systems along the disk rotation axis are significantly stronger than those along the galaxy disk, indicating the presence of strongly bipolar outflows aligned along the disk rotation axis as the origin of such systems. Galaxies lying in groups have more extended radial distribution of Mg II gas as compared to that of non-group galaxies and groups as a whole have more extended radial profiles than individual galaxies. These effects can be satisfactorily modeled by a simple superposition of the absorption profiles of individual member galaxies, assuming that these are the same as those of non-group galaxies, suggesting that the group environment may not significantly enhance or diminish the Mg II absorption of individual galaxies.

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