SIMBAD references

2017MNRAS.466L..29K - Mon. Not. R. Astron. Soc., 466, L29-L33 (2017/March-3)

Discovery of a supercluster in the Zone of Avoidance in Vela.

KRAAN-KORTEWEG R.C., CLUVER M.E., BILICKI M., JARRETT T.H., COLLESS M., ELAGALI A., BOHRINGER H. and CHON G.

Abstract (from CDS):

We report the discovery of a potentially major supercluster that extends across the Galactic plane in the constellation of Vela, at a mean recessional velocity of ∼18 000 km s–1. Recent multiobject spectroscopic observations of this Vela supercluster (VSCL), using AAOmega+2dF and the Southern African Large Telescope, confirm an extended galaxy overdensity in the Zone of Avoidance (ZOA) located where residual bulk flows predict a considerable mass excess. We present a preliminary analysis of ∼4500 new spectroscopic galaxy redshifts obtained in the ZOA centred on the Vela region (l = 272.5 ±20,b=0±10^○). The presently sparsely sampled data set traces an overdensity that covers 25^○in Galactic longitude on either side of the Galactic plane, suggesting an extent of 25 x 20 deg2, corresponding to ∼ 115 x 90 h70 Mpc at the supercluster redshift. In redshift space, the overdensity appears to consist of two merging wall-like structures, interspersed with clusters and groups. Both the velocity histogram and the morphology of the multibranching wall structure are consistent with a supercluster classification. K_ s_^ o^ galaxy counts show an enhancement of ∼1.2 over the survey area for galaxies brighter than MK^*^ at the VSCL distance, and a galaxy overdensity of δ = 0.50-0.77 within a photometric redshift shell around the VSCL, when compared with various Two Micron All-Sky Survey samples. Taking account of selection effects, the VSCL is estimated to contribute vLG 50 km s–1 to the motion of the Local Group.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: spectroscopic - surveys - galaxies: clusters: general - galaxies: distances and redshifts - cosmology: observations - large-scale structure of Universe - large-scale structure of Universe

Simbad objects: 11

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2019.12.13-09:27:40

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