HI Cosmology in the Local Universe with ALFALFA

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dc.creatorHaynes, Martha P.
dc.date2007-08-19
dc.date.accessioned2026-07-07T08:24:20Z
dc.date.available2026-07-07T08:24:20Z
dc.descriptionThe Arecibo Legacy Fast ALFA (ALFALFA) survey is an on-going second generation blind extragalactic HI survey exploiting Arecibo's superior sensitivity, angular resolution and digital technology to conduct a census of the local HI universe over a cosmologically significant volume. As of mid-2007, ~4500 good quality extragalactic HI line sources have been extracted in ~15% of the final survey area. ALFALFA is detecting HI masses as low as 10**6 Msun and as high as 10**10.8 Msun with positional accuracies typically better than 20 arcsec, allowing immediate identification of the most probable optical counterparts. Only 3% of all extragalactic HI sources and fewer than 1% of detections with M(HI) > 10**9.5 Msun cannot be identified with a stellar component. First ALFALFA results already suggest, in agreement with previous studies, that there does not appear to be a cosmologically significant population of optically dark but HI rich galaxies. ALFALFA promises a wealthy dataset for the exploration of many issues in near-field cosmology and galaxy evolution studies, setting the stage for their extension to higher redshifts with the Square Kilometer Array (SKA).
dc.descriptionTo appear in ASP Conference Series as proceedings of NRAO 50th Anniversary Symposium, "Frontiers of Astrophysics", June 18-21, 2007, A. Bridle, J. Condon and G. Hunt eds. 10 pages including 4 figures. Higher resolution version available at http://egg.astro.cornell.edu/alfalfa/pubs/haynes_nrao50.pdf
dc.identifierhttps://arxiv.org/abs/0708.2547
dc.identifierhttp://arxiv.org/abs/0708.2547
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/136307
dc.subjectAstrophysics
dc.titleHI Cosmology in the Local Universe with ALFALFA
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