Coma revealed as an extended hard X-rays source by INTEGRAL IBIS/ISGRI

M. Renaud (1, 2) , G. Bélanger (1, 2) , J. Paul (1, 2, 3) , F. Lebrun (1, 2) , R. Terrier (4)

1 APC (UMR_7164) - AstroParticule et Cosmologie
2 DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
3 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
4 APC - AHE - APC - Astrophysique des Hautes Energies

Aims. We report the INTEGRAL/IBIS observations of the Coma Cluster in the hard X-ray/soft-ray domain. Methods. Since the Coma Cluster appears as an extended source, its global intensity and significance cannot be directly extracted with standard coded mask analysis. We used the method of imaging the extended sources with a coded mask telescope developed by Renaud et al. (2006). Results. The imaging capabilities and the sensitivity of the IBIS/ISGRI coded mask instrument allows us to identify for the first time the site of the emission above ~ 15 keV. We have studied the Coma Cluster morphology in the 18-30keV band and found that it follows the prediction based on X-ray observations.We also bring constraints on the non-thermal mechanism contribution at higher energies.

Mots clés: Galaxies: clusters: Coma Cluster-; Methods: data analysis -- Gamma rays: observations -- X-rays: observations

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Astrophysique [astro-ph]

M. Renaud, G. Bélanger, J. Paul, F. Lebrun, R. Terrier. Coma revealed as an extended hard X-rays source by INTEGRAL IBIS/ISGRI. Astronomy and Astrophysics - A&A, 2006, 453 (1), pp.L5 - L8. ⟨10.1051/0004-6361:20065157⟩. ⟨hal-00078457v2⟩