A Steep Mass Function for Galaxy Baryons

Details A Steep Mass Function for Galaxy Baryons A Steep Mass Function for Galaxy Baryons

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.1912b&link_type=abstract

American Astronomical Society, AAS Meeting #212, #19.12; Bulletin of the American Astronomical Society, Vol. 40, p.532

Astronomy and Astrophysics

Astronomy

Scientific paper

We determine the field galaxy stellar mass function (GSMF) from the z < 0.05 NYU-VAGC SDSS sample. The GSMF shows clear evidence for a low-mass upturn with a power-law slope of -1.6 below 10^8.5 solar masses. This could be steeper given the increasing surface-brightness incompleteness at lower masses. Field galaxies also have increasing gas-to-stellar mass ratios toward lower masses implying that the galaxy baryonic mass function is steeper still. A simple conversion from the GSMF, based on the mass-metallicity relation, suggests that the slope of low-mass end of the baryonic mass function is -1.9 comparable to the halo mass function. The baryonic-infall efficiency may have leveled off at low masses with feedback processes primarily regulating star formation without expelling large fractions of gas mass.

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