INTEGRAL observations of the Perseus cluster

Free access article

Issue		A&A Volume 495, Number 2, February IV 2009


Page(s)		415 - 420
Section		Cosmology (including clusters of galaxies)
DOI		http://dx.doi.org/10.1051/0004-6361:200811154
Published online		22 December 2008

A&A 495, 415-420 (2009)
DOI: 10.1051/0004-6361:200811154

INTEGRAL observations of the Perseus cluster

D. Eckert and S. Paltani

ISDC Data Centre for Astrophysics, Geneva Observatory, University of Geneva, 16 ch. d'Ecogia, 1290 Versoix, Switzerland
e-mail: Dominique.Eckert@unige.ch

Recieved 15 October 2008 / Accepted 10 December 2008

Abstract
We present the results of a 500 ks observation of the Perseus cluster with INTEGRAL, with the aim of investigating the possible diffuse non-thermal component detected in a previous Chandra observation. In the 3-20 keV band with the JEM-X instrument, we detect the source with high significance and resolve it spatially. Above 20 keV with IBIS/ISGRI, we find that the source is point-like, and the cluster could be detected up to 120 keV. From the broad-band ISGRI/JEM-X spectrum, although we detect a non-thermal component, we find that the high-energy flux is variable and is consistent with the extrapolation of the 2-10 keV flux of the central AGN, NGC 1275. The extrapolation of the non-thermal component claimed from Chandra data exceeds the INTEGRAL spectrum by a factor of 3.

Key words: galaxies: clusters: individual: Perseus cluster -- X-rays: galaxies: clusters -- gamma rays: observations

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