NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-12-17 T01:40:37 PST
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For refcode 2011AJ....142..170H:
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2011AJ....142..170H The Arecibo Legacy Fast ALFA Survey: The {alpha}.40 H I Source Catalog, Its Characteristics and Their Impact on the Derivation of the H I Mass Function Haynes, Martha P.; Giovanelli, Riccardo; Martin, Ann M.; Hess, Kelley M.; Saintonge, Amelie; Adams, Elizabeth A. K.; Hallenbeck, Gregory; Hoffman, G. Lyle; Huang, Shan; Kent, Brian R.; Koopmann, Rebecca A.; Papastergis, Emmanouil; Stierwalt, Sabrina; Balonek, Thomas J.; Craig, David W.; Higdon, Sarah J. U.; Kornreich, David A.; Miller, Jeffrey R.; O'Donoghue, Aileen A.; Olowin, Ronald P.; Rosenberg, Jessica L.; Spekkens, Kristine; Troischt, Parker; Wilcots, Eric M. Abstract. We present a current catalog of 21 cm H I line sources extracted from the Arecibo Legacy Fast Arecibo L-band Feed Array (ALFALFA) survey over ~2800 deg^2^ of sky: the {alpha}.40 catalog. Covering 40% of the final survey area, the {alpha}.40 catalog contains 15,855 sources in the regions 07^h^30^m^ < R.A. < 16^h^30^m^, +04^degree^ < decl. <+16^degree^, and +24^degree^ < decl. <+28^degree^ and 22^h^ < R.A. < 03^h^, +14^degree^ < decl. <+16^degree^, and +24^degree^ < decl. < + 32^degree^. Of those, 15,041 are certainly extragalactic, yielding a source density of 5.3 galaxies per deg^2^, a factor of 29 improvement over the catalog extracted from the H I Parkes All-Sky Survey. In addition to the source centroid positions, H I line flux densities, recessional velocities, and line widths, the catalog includes the coordinates of the most probable optical counterpart of each H I line detection, and a separate compilation provides a cross-match to identifications given in the photometric and spectroscopic catalogs associated with the Sloan Digital Sky Survey Data Release 7. Fewer than 2% of the extragalactic H I line sources cannot be identified with a feasible optical counterpart; some of those may be rare OH megamasers at 0.16 < z < 0.25. A detailed analysis is presented of the completeness, width-dependent sensitivity function and bias inherent of the {alpha}.40 catalog. The impact of survey selection, distance errors, current volume coverage, and local large-scale structure on the derivation of the H I mass function is assessed. While {alpha}.40 does not yet provide a completely representative sampling of cosmological volume, derivations of the H I mass function using future data releases from ALFALFA will further improve both statistical and systematic uncertainties. Key words: catalogs, galaxies: distances and redshifts, galaxies: luminosity function, mass function, galaxies: spiral, radio lines: galaxies, surveys
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