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Shapley Supercluster Survey: Mapping the filamentary network connecting the clusters

Haines, C. P.; Busarello, G.; Merluzzi, P.; Pimbblet, K. A.; Vogt, F. P.A.; Dopita, M. A.; Mercurio, A.; Grado, A.; Limatola, L.

Authors

C. P. Haines

G. Busarello

P. Merluzzi

F. P.A. Vogt

M. A. Dopita

A. Mercurio

A. Grado

L. Limatola

Abstract

We have mapped the structure and connectivity of the Shapley supercluster core and its surroundings as traced by its member galaxies. To achieve this, we have carried out a new redshift survey of galaxies across a 21 square degree region (17×17 Mpc2) of the Shapley supercluster containing 11 rich clusters, all lying at z ~ 0.048. This survey aims to provide full spectroscopic coverage of galaxies for the Shapley Supercluster Survey (ShaSS), a multiwavelength survey based on high-quality optical ugri and near-infrared K-band imaging acquired with the 2.6-m VST and 4.1-m VISTA telescopes. Targets were selected from the VST images as having i < 18.0 and WISE/W1 < 15.5 mag, and the observations were carried out with the AAOmega spectrograph on the 3.9-m Anglo-Australian Telescope. We present here redshift measurements for 4027 galaxies, of which 957 belong to the Shapley Supercluster. Including existing measurements, there are now reliable redshifts for 95 per cent of galaxies within the survey's magnitude limits over the 21 deg2 region. This has enabled us to: (i) obtain a detailed map of the galaxy number density across the whole region; (ii) identify new groups and cluster substructures; (iii) establish the existence of a stream of galaxies connecting A3559 to the supercluster core.We provide updated central redshifts and velocity dispersions of the 11 clusters, confirming that they all lie within 1300 km s-1 of the central cluster Abell 3558. These 11 systems are all inter-connected and lie within a coherent sheet of galaxies that fills the entire survey region without gaps. Clear velocity caustics extend right to the survey boundary, indicating that the entire structure is gravitationally bound and in the process of collapse.

Journal Article Type Article
Publication Date Nov 21, 2018
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 481
Issue 1
Pages 1055-1074
Institution Citation Haines, C. P., Busarello, G., Merluzzi, P., Pimbblet, K. A., Vogt, F. P., Dopita, M. A., …Limatola, L. (2018). Shapley Supercluster Survey: Mapping the filamentary network connecting the clusters. Monthly notices, containing papers, abstracts of papers, and reports of the proceedings of the Society, 481(1), 1055-1074. https://doi.org/10.1093/MNRAS/STY2338
DOI https://doi.org/10.1093/MNRAS/STY2338
Keywords Catalogues; Galaxies: clusters: general; Large-scale structure of the universe; Cosmology: observations; Galaxies: clusters: individual: A3552, A3554, A3556, A3558, A3559, A3560, A3562
Publisher URL https://academic.oup.com/mnras/article/481/1/1055/5079654

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.



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