INTEGRAL Observations of the Perseus cluster

Abstract

We present the results of a 500 ksec 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.

Accepted to A&A, 6 pages, 5 figures

References in corpus (18)

• ISGRI: the INTEGRAL Soft Gamma-Ray Imager
• Cluster Magnetic Fields
• A deep Chandra observation of the Perseus cluster: shocks and ripples
• XMM-Newton observations of the Perseus Cluster I: The temperature and surface brightness structure
• The INTEGRAL Science Data Centre (ISDC)
• The Energy Spectrum of Primary Cosmic Ray Electrons in Clusters of Galaxies and Inverse Compton Emission
• Constraining the population of cosmic ray protons in cooling flow clusters with gamma-ray and radio observations: Are radio mini-halos of hadronic origin?
• Hard X-Ray Radiation in the Coma Cluster Spectrum
• A deeper X-ray study of the core of the Perseus galaxy cluster: the power of sound waves and the distribution of metals and cosmic rays
• Modeling the interaction between ICM and relativistic plasma in cooling flows: the case of the Perseus Cluster
• Obscuration and Origin of Nuclear X-ray emission in FR I Radio Galaxies
• Non-thermal X-rays, a high abundance ridge and fossil bubbles in the core of the Perseus cluster of galaxies
• The First INTEGRAL AGN Catalog
• Simulating cosmic rays in clusters of galaxies - III. Non-thermal scaling relations and comparison to observations
• Non-thermal hard X-ray emission in galaxy clusters observed with the BeppoSAX PDS
• INTEGRAL discovery of non-thermal hard X-ray emission from the Ophiuchus cluster
• Diffuse radio emission from the Intracluster medium
• Nonthermal hard X-ray excess in the cluster Abell 2256 from two epoch observations

Cited by in corpus (6)

• The Second INTEGRAL AGN Catalogue
• Probing the cosmic-ray content of galaxy clusters by stacking Fermi-LAT count maps
• Contemporaneous observations of the radio galaxy NGC 1275 from radio to very high energy gamma-rays
• Non-thermal Emissions from Cool Cores Heated by Cosmic-Rays in Galaxy Clusters
• Disentangling the gamma-ray emission of NGC1275 and that of the Perseus cluster
• Earth Occultation Imaging of the Low Energy Gamma-Ray Sky with GBM