EDP Sciences
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Volume 418, Number 1, April IV 2004
Page(s) L21 - L25
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20040111

A&A 418, L21-L25 (2004)
DOI: 10.1051/0004-6361:20040111


The impact of high pressure cluster environment on the X-ray luminosity of Coma early-type galaxies

A. Finoguenov1, 2 and F. Miniati3

1  Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, 85748 Garching, Germany
    e-mail: alexis@mpe.mpg.de
2  Space Research Institute, Profsoyuznaya 84/32, Moscow, 117810, Russia
3  Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85741, Garching, Germany
    e-mail: fm@mpa-garching.mpg.de

(Received 29 January 2004 / Accepted 10 March 2004)

We present an observational study of the $L_{\rm X}$ vs. $L_{\rm B} \sigma^2$ relation for early-type galaxies in the Coma cluster based on the XMM-Newton survey data. Compared to a similar relation for a sample dominated by field early-type galaxies, the Coma cluster galaxies show a flatter slope. Our calculations show that adiabatic compression produces a flattening in the $L_{\rm X}$ vs. $L_{\rm B} \sigma^2$ relation that is in remarkable agreement with the observed effect. Our scenario is further supported by the observed compactness of the X-ray emission of Coma galaxies.

Key words: clusters: individual: Coma -- X-rays: galaxies -- X-rays: ISM

Offprint request: A. Finoguenov, alexis@mpe.mpg.de

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