Joseph E. Coleman
The mass distribution of the unusual merging cluster Abell 2146 from strong lensing
Coleman, Joseph E.; King, Lindsay J.; Oguri, Masamune; Russell, Helen R.; Canning, Rebecca E.A.; Leonard, Adrienne; Santana, Rebecca; White, Jacob A.; Baum, Stefi A.; Clowe, Douglas I.; Edge, Alastair; Fabian, Andrew C.; McNamara, Brian R.; O'Dea, Christopher P.
Authors
Lindsay J. King
Masamune Oguri
Helen R. Russell
Rebecca E.A. Canning
Adrienne Leonard
Rebecca Santana
Jacob A. White
Stefi A. Baum
Douglas I. Clowe
Professor Alastair Edge alastair.edge@durham.ac.uk
Professor
Andrew C. Fabian
Brian R. McNamara
Christopher P. O'Dea
Abstract
Abell 2146 consists of two galaxy clusters that have recently collided close to the plane of the sky, and it is unique in showing two large shocks on Chandra X-ray Observatory images. With an early stage merger, shortly after first core passage, one would expect the cluster galaxies and the dark matter to be leading the X-ray emitting plasma. In this regard, the cluster Abell 2146-A is very unusual in that the X-ray cool core appears to lead, rather than lag, the brightest cluster galaxy (BCG) in their trajectories. Here we present a strong-lensing analysis of multiple-image systems identified on Hubble Space Telescope images. In particular, we focus on the distribution of mass in Abell 2146-A in order to determine the centroid of the dark matter halo. We use object colours and morphologies to identify multiple-image systems; very conservatively, four of these systems are used as constraints on a lens mass model. We find that the centroid of the dark matter halo, constrained using the strongly lensed features, is coincident with the BCG, with an offset of ≈2 kpc between the centres of the dark matter halo and the BCG. Thus from the strong-lensing model, the X-ray cool core also leads the centroid of the dark matter in Abell 2146-A, with an offset of ≈30 kpc.
Citation
Coleman, J. E., King, L. J., Oguri, M., Russell, H. R., Canning, R. E., Leonard, A., …O'Dea, C. P. (2017). The mass distribution of the unusual merging cluster Abell 2146 from strong lensing. Monthly Notices of the Royal Astronomical Society, 464(2), 2469-2480. https://doi.org/10.1093/mnras/stw2425
Journal Article Type | Article |
---|---|
Acceptance Date | Sep 23, 2016 |
Online Publication Date | Sep 26, 2016 |
Publication Date | Jan 11, 2017 |
Deposit Date | Apr 28, 2017 |
Publicly Available Date | May 9, 2017 |
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 | 464 |
Issue | 2 |
Pages | 2469-2480 |
DOI | https://doi.org/10.1093/mnras/stw2425 |
Public URL | https://durham-repository.worktribe.com/output/1359875 |
Related Public URLs | arxiv.org/pdf/1609.06765.pdf |
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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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