The HI Mass Function Derived from the 30% ALFALFA Survey: First Results and Environmental Dependence

Details The HI Mass Function Derived from the 30% ALFALFA Survey: First Results and Environmental Dependence The HI Mass Function Derived from the 30% ALFALFA Survey: First Results and Environmental Dependence

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545108m&link_type=abstract

American Astronomical Society, AAS Meeting #215, #451.08; Bulletin of the American Astronomical Society, Vol. 42, p.461

Astronomy and Astrophysics

Astronomy

Scientific paper

When complete, the ALFALFA survey catalog will cover 7000 square degrees and provide a catalog with 30,000 detections, improving our understanding of the density of HI in the local Universe and its environmental dependence. Following 585 observing runs with a total of 3400 hours of telescope time, observations for the ALFALFA survey are now 77% complete. Data reduction and catalog production has been completed for two large contiguous sections in the Virgo and anti-Virgo directions ( 1600 and 530 square degrees, respectively), and the ALFALFA survey now has the largest sample of blindly HI-selected galaxies. The regions analyzed here are 07h30< R.A. (J2000) < 16h30m, +4d < Dec. (J2000) < +16deg (Virgo direction) and 22h < R.A. (J2000) < 03h, +24d < Dec. (J2000) < +32deg (anti-Virgo direction). Together, these regions comprise the 30% ALFALFA Survey and contain on the order of 10,000 HI selected galaxies in a range of local environments, out to distances of 250 Mpc. In particular, this catalog contains 300 galaxies with log HI mass less than 8.0 solar masses, providing a robust determination of the low-mass end of the HI mass function presented here. Along with these preliminary results, we compare the HI mass function in the region containing the overdense Virgo cluster to that in the anti-Virgo direction, which includes the void in the foreground of the Pisces-Perseus supercluster. Finally, we discuss future improvements to this first HI mass function estimate from the ALFALFA survey.
This work is partly supported by NSF grant AST-0607007 and the Brinson Foundation.

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