The ALFA Zone of Avoidance Survey: Results from the Precursor Observations

Details The ALFA Zone of Avoidance Survey: Results from the Precursor Observations The ALFA Zone of Avoidance Survey: Results from the Precursor Observations

2007-08-13

arxiv.org/abs/0708.1724v1

Astronomy and Astrophysics

Astrophysics

To appear in Proceedings of IAU Symp #244, "Dark Galaxies and Lost Baryons", June 2007, 2 pages, including 1 figure

Scientific paper

10.1017/S174392130701438X

The Arecibo L-band Feed Array Zone of Avoidance Survey (ALFA ZOA) will map 1350-1800 square degrees at low Galactic latitude, providing HI spectra for galaxies in regions of the sky where our knowledge of local large scale structure remains incomplete, owing to obscuration from dust and high stellar confusion near the Galactic plane. Because of these effects, a substantial fraction of the galaxies detected in the survey will have no optical or infrared counterparts. However, near infrared follow up observations of ALFA ZOA sources found in regions of lowest obscuration could reveal whether some of these sources could be objects in which little or no star formation has taken place ("dark galaxies"). We present here the results of ALFA ZOA precursor observations on two patches of sky totaling 140 square degrees (near l=40 degrees, and l=192 degrees). We have measured HI parameters for detections from these observations, and cross-correlated with the NASA/IPAC Extragalactic Database (NED). A significant fraction of the objects have never been detected at any wavelength. For those galaxies that have been previously detected, a significant fraction have no previously known redshift, and no previous HI detection.

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