Identification and Detection of Ultra-compact High Velocity Clouds in the ALFALFA Survey

Details Identification and Detection of Ultra-compact High Velocity Clouds in the ALFALFA Survey Identification and Detection of Ultra-compact High Velocity Clouds in the ALFALFA Survey

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545106a&link_type=abstract

American Astronomical Society, AAS Meeting #215, #451.06; Bulletin of the American Astronomical Society, Vol. 42, p.460

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Scientific paper

For over two decades now, the mismatch between the number of low mass halos predicted by dark matter simulations and the number of observed low mass galaxies has been recognized (e.g. Klypin et al. 1999). Much work has gone into resolving this discrepancy, both in finding missing low mass galaxies and explaining why low mass halos may not host luminous galaxies. Recently, a class of ultra-compact high velocity clouds (UHVCs) have been detected in the ALFALFA survey that are consistent with the interpretation that they are minihalos in the Local Group. A preliminary sample of these objects, identified manually, are described in Giovanelli et al. (2009, in prep). These objects do not violate LCDM halo scaling parameters and are of low enough mass ( 105 solar masses at 1 Mpc) that they would not have been detected by HI surveys of nearby galaxy groups other than the Local Group. Here, we present preliminary results from a signal extraction method designed to automatically detect these objects in data from the ALFALFA survey.
This work is partly supported by NSF grant AST-0607007, a NSF GRFP, and the Brinson Foundation.

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