Detection of Excess Hard X-Ray Emission from the Group of Galaxies HCG 62
Open Access
- 10 January 2001
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 546 (2) , L87-L90
- https://doi.org/10.1086/318863
Abstract
We detected an excess of hard X-ray emission at energies above ~4 keV from the group of galaxies HCG 62 using data from the ASCA satellite. The excess emission is spatially extended up to ~10' from the group center and somewhat enhanced toward the north. Its spectrum can be represented by either a power law of photon index 0.8-2.7 or a bremsstrahlung of temperature greater than 6.3 keV. In the 2-10 keV range, the observed hard X-ray flux, (1.0 ± 0.3) × 10-12 ergs cm-2 s-1, implies a luminosity of (8.0 ± 2.0) × 1041 ergs s-1 for a Hubble constant of 50 km s-1 Mpc-1. The emission is thus too luminous to be attributed to X-ray binaries in the member galaxies. We discuss possible origins of the hard X-ray emission.Keywords
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