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Large-scale Structures behind the Southern Milky Way from Observations of Partially Obscured Galaxies

Published online by Cambridge University Press:  05 March 2013

R. C. Kraan-Korteweg ,
P. A. Woudt  and
P. A. Henning
R. C. Kraan-Korteweg
Affiliation:
Observatoire de Paris-Meudon, DAEC, 92195 Meudon Cedex, France; [email protected]
P. A. Woudt
Affiliation:
Department of Astronomy, University of Cape Town, Rondebosch 7700, South Africa
P. A. Henning
Affiliation:
Department of Physics and Astronomy, University of New Mexico, Albuquerque, USA
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Abstract

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We report here on extragalactic large-scale structures uncovered by a deep optical survey for galaxies behind the southern Milky Way. Systematic visual inspection of the ESO/SRC survey revealed over 10000 previously unknown galaxies in the region 265° ≲ l ≲ 340°, ∣b∣ ≲ 10°. With subsequently obtained redshifts of more than 10% of these galaxies, new structures across the Milky Way are unveiled, such as a filament at ∼2500 km s−1 connecting to the Hydra and Antlia clusters, a shallow extended superduster in Vela (∼6000 km s−1), and a nearby (4882 km s−1), very massive (M ∼ 2 – 5 × 1015M☉), rich Coma-like cluster which seems to constitute the previously unidentified centre of the Great Attractor.

The innermost part of the Milky Way, where the foreground obscuration in the blue is AB ≳ 5m, i.e. where HI-column densities Nhi ≳ 6·1021cm−2, remains fully opaque. In this approximately 8° wide strip, the forthcoming blind HI survey with the multibeam system at Parkes will provide the only tool to unveil this part of the extragalactic sky.

Keywords

galaxies: distances and redshiftslarge-scale structure of Universesurveys
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 14 , Issue 1 , 1997 , pp. 15 - 20
Copyright
Copyright © Astronomical Society of Australia 1997

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