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

Publications of the Astronomical Society of Australia

R. C. Kraan-Korteweg¹ 

[1] P. A. Woudt

关键词: galaxies: distances and redshifts;    large-scale structure of Universe;    surveys;   

DOI  :  10.1071/AS97015

学科分类：天文学(综合)

来源: CSIRO

【 摘 要 】

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.

【 授权许可】

Unknown