Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545107n&link_type=abstract
American Astronomical Society, AAS Meeting #215, #451.07; Bulletin of the American Astronomical Society, Vol. 42, p.460
Astronomy and Astrophysics
Astronomy
Scientific paper
The ongoing ALFALFA survey will provide a census of HI in galaxies up to z = 0.06. Among all of the galaxies observed by the ALFALFA survey to date, there is a significant population with log HI mass greater than 10. These massive gas disks represent the extreme of a population which will be studied in the future by telescopes such as the Square Kilometer Array. We present a study of the properties and characteristics of the highest HI mass populations. All of the massive HI galaxies can be identified with optical counterparts; the combination of the HI flux and line width with optical sizes, magnitudes and colors from the SDSS permits a comparison of the gas component with the stellar and dynamical components of these galaxies, and on where these galaxies reside within the local large scale structure. A subset of massive HI disks reside in very gas-rich or optically-underluminous galaxies, with HI to stellar mass ratios greater than 1. The existence of such massive but still gas-dominated galaxies appears to contradict the general idea of "downsizing". We examine trends within the high HI mass population to look for clues as to how such objects could retain their neutral gas without converting it into stars.
This work is partly supported by NSF grant AST-0607007, by the Brinson Foundation, and by the Cornell Presidential Research Scholars program.
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