ALFALFA Observations of the Virgo cluster and its environs

Details ALFALFA Observations of the Virgo cluster and its environs ALFALFA Observations of the Virgo cluster and its environs

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20717920k&link_type=abstract

American Astronomical Society Meeting 207, #179.20; Bulletin of the American Astronomical Society, Vol. 37, p.1457

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The extragalactic HI ALFALFA survey (Giovanelli et al. 2005, AJ in press and astro-ph/0508301) will map 900 square degrees of the Local Supercluster and yield complete coverage of the entire Virgo cluster. The ALFALFA survey uses the ALFA multibeam feed array and will cover 7000 square degrees of sky. The first observing season with the Arecibo 305m radio telescope in Spring 2005 has yielded a nearly complete dataset over sixty square degrees (12h < RA < 13h and +9o < DEC < +13o), focusing primarily on the region south of the center of Virgo. Gridded data cubes have been produced of bandpass calibrated and RFI-flagged data, resulting in maps with four arcminute resolution and a final integration time of 48 seconds per beam. A catalog of detections has been extracted from the cubes with reliable integrated fluxes, velocity widths, redshifts and positions down to a signal-to-noise ratio threshold of four. These positions have been carefully examined in online optical databases including SDSS DR4 and the Digital Sky Survey, as well as galaxy catalogs such as the Arecibo General Catalog. In addition to testing pre-survey simulations of number density and galaxy distributions in the Virgo region, the HI properties of the derived catalog will be discussed. This work has been supported by NSF grants AST--0307661 and AST--0435697 and by the Brinson Foundation.

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