Statistics – Methodology
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733415h&link_type=abstract
American Astronomical Society, AAS Meeting #217, #334.15; Bulletin of the American Astronomical Society, Vol. 43, 2011
Statistics
Methodology
Scientific paper
Using both a smoothed density field and group finding, we examine the dependence of atomic gas-to-stellar mass ratios on local density and group membership in order to determine whether the previously identified "gas-richness threshold mass" is environmentally dependent. The gas-richness threshold mass, near 5x109 Msun, marks the scale below which galaxies with atomic gas-to-stellar mass ratios greater than one emerge abundantly. Whether or not this scale depends on environment will constrain the physical mechanism underlying it. We use two samples, both at low redshift. The first is a volume-limited combined CfA2-SDSS catalog; the other is the NYU VAGC low-redshift catalog. We present the concept and methodology behind the density field calculation, display the results of group finding on the combined CfA2-SDSS sample, examine the correspondence between the two environment metrics, and display the preliminary results of our search for environmental dependence of the threshold mass. We acknowledge the support of the National Space Grant College and Fellowship Program and the North Carolina Space Grant Consortium.
Berlind Andreas A.
Eckert K. D.
Grogin Norman Andrew
Hendel David
Kannappan Sheila J.
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