INTEGRAL observations of the Perseus cluster
ISDC Data Centre for Astrophysics, Geneva Observatory, University of Geneva, 16 ch. d'Ecogia, 1290 Versoix, Switzerland e-mail: Dominique.Eckert@unige.ch
Accepted: 10 December 2008
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
© ESO, 2009