T. Mutabazi
The Norma cluster (ACO 3627) - III. The distance and peculiar velocity via the near-infrared Ks-band Fundamental Plane
Mutabazi, T.; Blyth, S.L.; Woudt, P.A.; Lucey, J.R.; Jarrett, T.H.; Bilicki, M.; Schröder, A.C.; Moore, S.A.W.
Authors
S.L. Blyth
P.A. Woudt
John Lucey john.lucey@durham.ac.uk
Emeritus Professor
T.H. Jarrett
M. Bilicki
A.C. Schröder
S.A.W. Moore
Abstract
While Norma (ACO 3627) is the richest cluster in the Great Attractor (GA) region, its role in the local dynamics is poorly understood. The Norma cluster has a mean redshift (zCMB) of 0.0165 and has been proposed as the ‘core’ of the GA. We have used the Ks-band Fundamental Plane (FP) to measure Norma cluster's distance with respect to the Coma cluster. We report FP photometry parameters (effective radii and surface brightnesses), derived from ESO New Technology Telescope Son of ISAAC images, and velocity dispersions, from Anglo-Australian Telescope 2dF spectroscopy, for 31 early-type galaxies in the cluster. For the Coma cluster we use Two Micron All Sky Survey images and Sloan Digital Sky Survey velocity dispersion measurements for 121 early-type galaxies to generate the calibrating FP data set. For the combined Norma–Coma sample we measure FP coefficients of a = 1.465 ± 0.059 and b = 0.326 ± 0.020. We find an rms scatter, in log σ, of ∼0.08 dex which corresponds to a distance uncertainty of ∼28 per cent per galaxy. The zero-point offset between Norma's and Coma's FPs is 0.154 ± 0.014 dex. Assuming that the Coma cluster is at rest with respect to the cosmic microwave background frame and zCMB(Coma) = 0.0240, we derive a distance to the Norma cluster of 5026 ± 160 km s−1, and the derived peculiar velocity is −72 ± 170 km s−1, i.e. consistent with zero. This is lower than previously reported positive peculiar velocities for clusters/groups/galaxies in the GA region and hence the Norma cluster may indeed represent the GA's ‘core’.
Citation
Mutabazi, T., Blyth, S., Woudt, P., Lucey, J., Jarrett, T., Bilicki, M., …Moore, S. (2014). The Norma cluster (ACO 3627) - III. The distance and peculiar velocity via the near-infrared Ks-band Fundamental Plane. Monthly Notices of the Royal Astronomical Society, 439(4), 3666-3682. https://doi.org/10.1093/mnras/stu217
Journal Article Type | Article |
---|---|
Publication Date | Apr 21, 2014 |
Deposit Date | Apr 27, 2014 |
Publicly Available Date | Apr 30, 2014 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 439 |
Issue | 4 |
Pages | 3666-3682 |
DOI | https://doi.org/10.1093/mnras/stu217 |
Keywords | Galaxies: Clusters, Norma cluster (ACO 3627), Distances and redshifts, Photometry. |
Public URL | https://durham-repository.worktribe.com/output/1466156 |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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