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The Fundamental Plane for z = 0.8-0.9 Cluster Galaxies

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Published 6 February 2006 • © 2006. The American Astronomical Society. All rights reserved. Printed in U.S.A.
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An erratum for this article has been published in 2007 ApJ 654 L179

Article information
Author e-mails

ijorgensen@gemini.edu

kchibouc@gemini.edu

kathleen.flint@stonybrook.edu

mbergmann@gemini.edu

jmb@astro.ox.ac.uk

rld@astro.ox.ac.uk

Author affiliations

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

2 Current address: State University of New York at Stony Brook, The Reinvention Center, Stony Brook, NY 11794

3 Gemini Observatory, Casilla 603, La Serena, Chile

4 Department of Astrophysics, University of Oxford, Keble Road, Oxford OX1 3RH, UK

Dates

Received 8 December 2005
Accepted 17 January 2006
Published

Citation

Inger Jørgensen et al 2006 ApJ 639 L9

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DOI

https://doi.org/10.1086/501348

Keywords

galaxies: clusters: individual (RX J0152.7–1357 RX J1226.9+3332) ; galaxies: evolution; galaxies: stellar content

Journal RSS feed

1538-4357/639/1/L9

Abstract

We present the fundamental plane (FP) for 38 early-type galaxies in the two rich galaxy clusters RX J0152.7-1357 (z = 0.83) and RX J1226.9+3332 (z = 0.89), reaching a limiting magnitude of MB = -19.8 in the rest frame of the clusters. While the zero-point offset of the FP for these high-redshift clusters relative to our low-redshift sample is consistent with passive evolution with a formation redshift of zform ≈ 3.2, the FP for the high-redshift clusters is not only shifted as expected for a mass-independent zform but rotated relative to the low-redshift sample. Expressed as a relation between the galaxy masses and the mass-to-light ratios, the FP is significantly steeper for the high-redshift clusters than for our low-redshift sample. We interpret this as a mass dependency of the star formation history, as has been suggested by other recent studies. The low-mass galaxies (1010.3 M☉) have experienced star formation as recently as z ≈ 1.35 (1.5 Gyr prior to their look-back time), while galaxies with masses larger than 1011.3 M☉ had their last major star formation episode at z > 4.5.

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