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.
© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
techniques: spectroscopic - surveys - galaxies: clusters: general - galaxies: distances and redshifts - cosmology: observations - large-scale structure of Universe - large-scale structure of Universe
View the reference in ADS
To bookmark this query, right click on this link: simbad:2017MNRAS.466L..29K and select 'bookmark this link' or equivalent in the popup menu