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Discovery of a supercluster in the Zone of Avoidance in Vela

Kraan-Korteweg, Renee Christine; Cluver, M.E.; Bilicki, Maciej Iej; Jarrett, Thomas; Colless, Matthew; Elagali, Ahmed; Bohringer, Hans; Chon, Gayoung

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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...[Show more]

dc.contributor.authorKraan-Korteweg, Renee Christine
dc.contributor.authorCluver, M.E.
dc.contributor.authorBilicki, Maciej Iej
dc.contributor.authorJarrett, Thomas
dc.contributor.authorColless, Matthew
dc.contributor.authorElagali, Ahmed
dc.contributor.authorBohringer, Hans
dc.contributor.authorChon, Gayoung
dc.date.accessioned2021-06-08T01:43:20Z
dc.date.available2021-06-08T01:43:20Z
dc.identifier.issn1745-3925
dc.identifier.urihttp://hdl.handle.net/1885/236810
dc.description.abstractWe 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 × 20 deg2, corresponding to ~ 115×90 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. Ks 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
dc.description.sponsorshipRCK-K, THJ, and MEC acknowledge research support from the NRF. MB is supported through grants #614.001.451 from the NWO, FP7 #279396 from the ERC, and #UMO-2012/07/D/ST9/02785 from the NCN
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherOxford University Press
dc.rights© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
dc.sourceMonthly Notices of the Royal Astronomical Society: Letters
dc.subjecttechniques: spectroscopic
dc.subjectsurveys
dc.subjectgalaxies: clusters: general
dc.subjectgalaxies: distances and redshifts
dc.subjectcosmology: observations
dc.subjectlarge-scale structure of Universe
dc.titleDiscovery of a supercluster in the Zone of Avoidance in Vela
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume466
dc.date.issued2017
local.identifier.absfor020103 - Cosmology and Extragalactic Astronomy
local.identifier.ariespublicationa383154xPUB5785
local.publisher.urlhttp://mnrasl.oxfordjournals.org/
local.type.statusPublished Version
local.contributor.affiliationKraan-Korteweg, Renee Christine, University of Cape Town
local.contributor.affiliationCluver, M.E., University of the Western Cape
local.contributor.affiliationBilicki, Maciej Iej, Leiden Observatory Research Institute
local.contributor.affiliationJarrett, Thomas, University of Cape Town
local.contributor.affiliationColless, Matthew, College of Science, ANU
local.contributor.affiliationElagali, Ahmed, University of Cape Town
local.contributor.affiliationBohringer, Hans, Max-Planck-Institut fur extraterrestrische Physik
local.contributor.affiliationChon, Gayoung, Max-Planck-Institut fur extraterrestrische Physik
local.identifier.essn1745-3933
local.bibliographicCitation.issue1
local.bibliographicCitation.startpageL-29
local.bibliographicCitation.lastpageL-33
local.identifier.doi10.1093/mnrasl/slw229
dc.date.updated2020-11-23T10:26:02Z
local.identifier.scopusID2-s2.0-85018262492
local.identifier.thomsonID000410059100007
dcterms.accessRightsOpen Access
dc.provenancehttps://v2.sherpa.ac.uk/id/publication/23329..."The Published Version can be archived in a Non-Commercial Institutional Repository" from SHERPA/RoMEO site (as at 8/06/2021).
CollectionsANU Research Publications

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