The Undergraduate ALFALFA Groups Project: Development of a Galaxy Environment Index

Details The Undergraduate ALFALFA Groups Project: Development of a Galaxy Environment Index The Undergraduate ALFALFA Groups Project: Development of a Galaxy Environment Index

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545102c&link_type=abstract

American Astronomical Society, AAS Meeting #215, #451.02; Bulletin of the American Astronomical Society, Vol. 42, p.460

Astronomy and Astrophysics

Astronomy

Scientific paper

The Undergraduate ALFALFA (Arecibo Legacy Fast ALFA) Team Groups Project is a collaborative undertaking of faculty and undergraduates at 8 institutions, aimed at investigating properties of galaxy groups surveyed by the ALFALFA blind HI survey. We present a galaxy environment index designed to reflect local density in the regions surrounding galaxy groups. These regions typically include hundreds of galaxies with optical and HI properties that can be compared with environment. For example, an 8x10 degree region surrounding the group MKW 11 includes 535 galaxies at the group redshift of 0.02, 139 of which are detected in HI. This work has been supported by NSF grants AST-0724918, AST-0725267, and AST-0725380.

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