The HI Parkes Zone of Avoidance Shallow Survey

P. A. Henning , L. Staveley-Smith , R. C. Kraan-Korteweg , E. M. Sadler, PASA, 16 (1), 35
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Contents Page: Volume 16, Number 1

The HI Parkes Zone of Avoidance Shallow Survey

P. A. Henning 1
L. Staveley-Smith 2
R. C. Kraan-Korteweg 3
E. M. Sadler 4

1 Institute for Astrophysics, University of New Mexico, Albuquerque, NM, 87131, USA
henning@tinsley.phys.unm.edu

2 Australia Telescope National Facility, CSIRO, P. O. Box 76, Epping, NSW 1710, Australia
Lister.Staveley-Smith@atnf.csiro.au

3 Departamento de Astronomia, Universidad de Guanajuato, Guanajuato, Gto. CP 36000, Mexico
kraan@astro.ugto.mx

4 School of Physics, University of Sydney, NSW 2006, Australia
EMS@astrop.physics.usyd.edu.au

Abstract:

The HI Parkes Zone of Avoidance Survey is a 21 cm blind search with the multibeam receiver on the 64-m radiotelescope, looking for galaxies hidden behind the southern Milky Way. The first, shallow (15 mJy rms) phase of the survey has uncovered 107 galaxies, two-thirds of which were previously unknown. The addition of these galaxies to existing extragalactic catalogs allows the connectivity of a very long, thin filament across the Zone of Avoidance within

$3500 \,\rm\,km\,s^{-1}$ to become evident. No local, hidden, very massive objects were uncovered. With similar results in the north (The Dwingeloo Obscured Galaxies Survey) our census of the most dynamically important HI-rich nearby galaxies is now complete, at least for those objects whose HI profiles are not totally buried in the Galactic HI signal. Tests are being devised to better quantify this remaining ZOA for blind HI searches. The full survey is ongoing, and is expected to produce a catalog of thousands of objects when it is finished.

Keywords: zone of avoidance - surveys - galaxies: HI - large-scale structure of the universe



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