Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924612p&link_type=abstract
American Astronomical Society, AAS Meeting #219, #246.12
Astronomy and Astrophysics
Astronomy
Scientific paper
The properties of USGC U579, the loose group of 110 galaxies roughly centered on Hickson Compact Group 069, are studied to assess the effect of the group environment on the galaxies. Data are drawn from the ongoing Arecibo Legacy Fast ALFA (ALFALFA) Survey of neutral hydrogen, from the Sloan Digital Sky Survey (SDSS) and from the NASA/IPAC Extragalactic Database (NED). Methods of determining the dynamical mass of the group are explored, as well as methods for determining the baryonic mass of the group using combined gas and stellar mass values, where the gas mass is scaled from the neutral hydrogen mass calculated from ALFALFA data, and the stellar mass is calculated from SDSS and NED data. An initial total mass to baryonic mass ratio of about 144 is found, a reasonable ratio considering the size of the group. Hydrogen deficiency is explored within the group and is not found to be statistically significant when the inner and outer portions of the group are compared, nor when HCG 069 is compared to the rest of the group. As part of the broader Undergraduate ALFALFA Team project group this work furthers investigation of galaxy formation and evolution. The Undergraduate ALFALFA Team has been sponsored by NSF grants AST-0724918, AST-0725267, AST-0725380, AST-0902211 and AST-0903394.
Hoffman Lyle G.
Pinkard Michael
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