Large-Scale Structures Behind the Southern Milky Way from Observations of Partially Obscured Galaxies

Details Large-Scale Structures Behind the Southern Milky Way from Observations of Partially Obscured Galaxies Large-Scale Structures Behind the Southern Milky Way from Observations of Partially Obscured Galaxies

1996-11-13

arxiv.org/abs/astro-ph/9611099v1

Astronomy and Astrophysics

Astrophysics

Presented at the Multibeam Workshop on ``HI in the Local Universe'', Sydney, May 13-15 1996. Accepted 2.11.1996 for publicatio

Scientific paper

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 connecting to the Hydra and Antlia clusters, a shallow extended supercluster in Vela (~ 6000km/s), and a nearby (4882 km/s), very massive (M ~ 2-5 10^15 Msun), rich Coma-like cluster which seems to constitute the previously unidentified center of the Great Attractor. The innermost part of the Milky Way where the foreground obscuration in the blue is 5mag, respectively HI-column densities greater than 6 10^21 / cm^2 remains fully opaque. In this approximately 8 degrees wide strip, the forthcoming blind HI-survey with the multi-beam system at Parkes will provide the only tool to unveil this part of the extragalactic sky.

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