Volume 391, Number 3, September I 2002
|Page(s)||887 - 902|
|Section||Cosmology (including clusters of galaxies)|
|Published online||09 August 2002|
Parkes H I observations of galaxies behind the southern Milky Way*
I. The Hydra/Antlia region ( 266 to 296)
Depto. de Astronomía, Universidad de Guanajuato, Apartado Postal 144, Guanajuato, Gto 36000, Mexico
2 Institute for Astrophysics, University of New Mexico, 800 Yale Blvd., NE, Albuquerque, NM 87131, USA
3 Dept. of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
Corresponding author: R. C. Kraan-Korteweg, firstname.lastname@example.org
Accepted: 11 June 2002
As part of our program to map the large-scale distribution of galaxies behind the Milky Way, we used the Parkes 210 ft (64 m) radio telescope for pointed observations of a sample of low surface-brightness (due to heavy obscuration) spiral galaxies selected from the deep optical Zone of Avoidance (ZOA) galaxy catalog in the Hydra/Antlia region (Kraan-Korteweg [CITE]). Searching a simultaneous velocity range of either 300 to 5500 km s-1 or 300 to 10 500 km s-1 to an rms level of typically 2–4 m Jy resulted in detections in 61 of the 139 pointings, leading to a total of 66 detections (an additional detection was made in a reference position, and two other pointings revealed two and four independent signals respectively). Except for 2 strong emitters identified in the shallow Zone of Avoidance survey (Henning et al. [CITE]), all detections are new. An analysis of the properties of the observed and detected galaxies prove that pointed observations of highly obscured galaxies allow the tracing of a population of nearby, intrinsically large and bright spiral galaxies that otherwise would not be recovered. The new data identified a previously unrecognized nearby group at km s-1, the continuation of the Hydra/Antlia filament on the opposite side of the Galactic plane, and helped to delimit a distinct void in the ZOA centered at 2000 km s-1.
Key words: catalogs / surveys / ISM: dust, extinction / galaxies: fundamental parameters / radio lines: galaxies / cosmology: large-scale structure of the Universe
© ESO, 2002
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