Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341812f&link_type=abstract
American Astronomical Society, AAS Meeting #213, #418.12; Bulletin of the American Astronomical Society, Vol. 41, p.232
Other
Scientific paper
This poster presents the first look at combining data from the Arecibo Legacy Fast ALFA (ALFALFA), a blind HI 21cm radio survey, with optical data from the Sloan Digital Sky Survey (SDSS). The goal of the project is to study the state of baryonic mass in galaxies in order to provide a better understanding of the evolution of gas into stars. Optical surveys tend to overlook some gas-rich galaxies such as low surface brightness galaxies because these systems are too low-contrast to easily be identified by their starlight while HI surveys can easily identify such objects by the gas that they contain. However, HI surveys tend to miss elliptical and spheroidal galaxies that have little gas. Therefore, the combination of the ALFALFA and SDSS data will allow a wider selection of objects to be detected and studied than would be possible with only one survey or the other. The data presented here are taken from one region of sky where ALFALFA and SDSS overlap. The environments probed in this region include the Great Wall and the low-density region in front of the Great Wall. It is found that this region contains a variety of galaxies from very dim, gas-deprived ellipticals to extremely bright, gas-rich spirals. We present measurements of HI mass, optical luminosity, and velocity width for galaxies in the sample and examine the relationship between these quantities. ALFALFA, PIs Giovanelli and Haynes, is a legacy survey funded by NAIC and NSF. SDSS is a legacy survey managed by the Astrophysical Research Consortium for the Participating Institutions.
ALFALFA Team
Faith Horne Lisa
Rosenberg Jessica L.
West Andrew A.
Zeh P.
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