The ALFA Zone of Avoidance Survey: Results from the Precursor Observations - AstrophysicsReport as inadecuate

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Abstract: The Arecibo L-band Feed Array Zone of Avoidance Survey ALFA ZOA will map1350-1800 square degrees at low Galactic latitude, providing HI spectra forgalaxies in regions of the sky where our knowledge of local large scalestructure remains incomplete, owing to obscuration from dust and high stellarconfusion near the Galactic plane. Because of these effects, a substantialfraction of the galaxies detected in the survey will have no optical orinfrared counterparts. However, near infrared follow up observations of ALFAZOA sources found in regions of lowest obscuration could reveal whether some ofthese sources could be objects in which little or no star formation has takenplace -dark galaxies-. We present here the results of ALFA ZOA precursorobservations on two patches of sky totaling 140 square degrees near l=40degrees, and l=192 degrees. We have measured HI parameters for detections fromthese observations, and cross-correlated with the NASA-IPAC ExtragalacticDatabase NED. A significant fraction of the objects have never been detectedat any wavelength. For those galaxies that have been previously detected, asignificant fraction have no previously known redshift, and no previous HIdetection.

Author: C. M. Springob, P. A. Henning, B. Catinella, F. Day, R. Minchin, E. Momjian, B. Koribalski, K. L. Masters, E. Muller, C. Pantoja,


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