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The Fundamental Plane in RX J0142.0+2131: A Galaxy Cluster Merger at z = 0.28

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Published 5 September 2006 • © 2006. The American Astronomical Society. All rights reserved. Printed in U.S.A.
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Article information
Author e-mails

jmb@astro.ox.ac.uk

rld@astro.ox.ac.uk

ijorgensen@gemini.edu

kchibouc@gemini.edu

mbergmann@gemini.edu

Author affiliations

1 Oxford University, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK

2 Gemini Observatory, 670 North A'ohoku Place, Hilo, HI 96720

3 Gemini Observatory, Casilla 603, La Serena, Chile

Dates

Received 25 April 2006
Accepted 7 August 2006
Published

Citation

Jordi Barr et al 2006 ApJ 649 L1

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DOI

https://doi.org/10.1086/508257

Keywords

galaxies: clusters: individual (RX J0142.0+2131) ; galaxies: evolution; galaxies: stellar content

Journal RSS feed

1538-4357/649/1/L1

Abstract

We present the fundamental plane (FP) in the z = 0.28 cluster of galaxies RX J0142.0+2131. There is no evidence for a difference in the slope of the FP when compared with the Coma Cluster, although the internal scatter is larger. On average, stellar populations in RX J0142.0+2131 have rest-frame V-band mass-to-light ratios (M/LV) 0.29 ± 0.03 dex lower than in Coma. This is significantly lower than expected for a passively evolving cluster formed at zf = 2. Lenticular galaxies have lower average M/LV and a distribution of M/LV with larger scatter than ellipticals. Lower mass-to-light ratios are not due to recent star formation: our previous spectroscopic observations of RX J0142.0+2131 E/S0 galaxies showed no evidence for significant star formation within the past ~4 Gyr. However, cluster members have enhanced α-element abundance ratios, which may act to decrease M/LV. The increased scatter in the RX J0142.0+2131 FP reflects a large scatter in M/LV implying that galaxies have undergone bursts of star formation over a range of epochs. The seven easternmost cluster galaxies, including the second brightest member, have M/LV consistent with passive evolution and zf = 2. We speculate that RX J0142.0+2131 is a cluster-cluster merger where the galaxies to the east are yet to fall into the main cluster body or have not experienced star formation as a result of the merger.

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