Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714923m&link_type=abstract
American Astronomical Society, AAS Meeting #217, #149.23; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
The Arecibo Galaxy Environment Survey (AGES) is the deepest wide-area blind HI survey to date. Each surveyed region is centered on a nearby galaxy, group or cluster: we here report on the observations of the NGC 7448 group. Galaxy interactions in the NGC 7448 group reveal themselves through tidal tails and bridges - we find approximately 2.5 times more atomic gas in the intragroup medium than in the group galaxies. We also identify five new dwarf galaxies, two of which appear to be members of the NGC 7448 group. This is too few dwarf galaxies to reconcile observations with theoretical predictions of galaxy formation models.
Combining the data from this group with observations of other AGES regions to derive an HI mass function which is well fit by a Schechter function with a relatively steep faint-end slope of -1.53 ± 0.5. Integrating this mass function gives a cosmic mass density of neutral hydrogen of 8.9 ± 0.8 x 10-4 - twice that found in the ALFALFA survey and almost three times higher than found in HIPASS.
Davies Jonathan I.
Galaxy Environment Survey (AGES) Arecibo
Minchin Robert F.
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