Discovery of a supercluster in the Zone of Avoidance in Vela. (8th November 2016)
- Record Type:
- Journal Article
- Title:
- Discovery of a supercluster in the Zone of Avoidance in Vela. (8th November 2016)
- Main Title:
- Discovery of a supercluster in the Zone of Avoidance in Vela
- Authors:
- Kraan-Korteweg, Renée C.
Cluver, Michelle E.
Bilicki, Maciej
Jarrett, Thomas H.
Colless, Matthew
Elagali, Ahmed
Böhringer, Hans
Chon, Gayoung - Abstract:
- Abstract: 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 ($l = 272{^{\circ}_{.}}5 \pm 20^\circ, b = 0^\circ \pm 10^\circ$ ). The presently sparsely sampled data set traces an overdensity that covers $25^\circ$ in Galactic longitude on either side of the Galactic plane, suggesting an extent of 25 × 20 deg 2, corresponding to ∼ 115 × 90 h 70 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. $K_{\rm s}^{\rm o}$ galaxy counts show an enhancement of ∼1.2 over the survey area for galaxies brighter than $M_{K}^{\ast }$ 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. TakingAbstract: 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 ($l = 272{^{\circ}_{.}}5 \pm 20^\circ, b = 0^\circ \pm 10^\circ$ ). The presently sparsely sampled data set traces an overdensity that covers $25^\circ$ in Galactic longitude on either side of the Galactic plane, suggesting an extent of 25 × 20 deg 2, corresponding to ∼ 115 × 90 h 70 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. $K_{\rm s}^{\rm o}$ galaxy counts show an enhancement of ∼1.2 over the survey area for galaxies brighter than $M_{K}^{\ast }$ 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 $v_\mathrm{LG} \gtrsim 50$ km s −1 to the motion of the Local Group. … (more)
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 466:Number 1(2017:Mar.)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 466:Number 1(2017:Mar.)
- Issue Display:
- Volume 466, Issue 1 (2017)
- Year:
- 2017
- Volume:
- 466
- Issue:
- 1
- Issue Sort Value:
- 2017-0466-0001-0000
- Page Start:
- L29
- Page End:
- L33
- Publication Date:
- 2016-11-08
- Subjects:
- techniques: spectroscopic -- surveys -- galaxies: clusters: general -- galaxies: distances and redshifts -- cosmology: observations -- large-scale structure of Universe
Astronomy -- Research -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1745-3933 ↗
http://www.blackwell-synergy.com/loi/mnl ↗
http://www3.interscience.wiley.com/journal/118500770/home ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnrasl/slw229 ↗
- Languages:
- English
- ISSNs:
- 1745-3933
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5944.000100
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 25966.xml