Building Galaxy Disks: The Gas-Richness Threshold Mass

Details Building Galaxy Disks: The Gas-Richness Threshold Mass Building Galaxy Disks: The Gas-Richness Threshold Mass

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21532901k&link_type=abstract

American Astronomical Society, AAS Meeting #215, #329.01; Bulletin of the American Astronomical Society, Vol. 42, p.426

Astronomy and Astrophysics

Astronomy

Scientific paper

The frequency of galaxies with gas-to-stellar mass ratios greater than one rises sharply below a stellar mass threshold of 5x109 Msun. Updating earlier work, we show that this threshold mass is distinct from the well-known bimodality mass (stellar mass 3x1010 Msun). Going downward in mass, the 5x109 Msun gas-richness threshold also marks a sudden increase in the abundance of blue-sequence E/S0 galaxies, a class of galaxies showing evidence of disk regrowth processes after mergers. Additionally, the corresponding threshold in dynamical mass marks the emergence of a population of extremely blue late-type galaxies with dynamics suggesting excess baryonic dark matter, likely reflecting a significant gas component undetected in HI or CO. We examine these phenomena as a function of environment to test their relationship to cosmic gas accretion, and we discuss the role of galaxy interactions in regulating the timescales for gas phase conversions and star formation.

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