The X-Ray Counterpart of the Gamma-Ray Sky

Eugenio Bottacini, Marco Ajello
2016 Proceedings of The 34th International Cosmic Ray Conference — PoS(ICRC2015)   unpublished
All-sky explorations by Fermi-LAT have revolutionized our view of the gamma-ray Universe. While its ongoing all-sky survey counts thousands of sources, essential issues related to the nature of unassociated sources call for more sensitive all-sky surveys at hard X-ray energies that allow for their identification. This latter energy band encodes the hard-tail of the thermal emission and the soft-tail of non-thermal emission thereby bridging the non-thermal and thermal emission mechanisms of
more » ... -ray sources. All-sky surveys at hard X-rays are best performed by current coded-mask telescopes Swift/BAT and INTEGRAL/IBIS. To boost the hard X-ray all-sky sensitivity, we have developed an ad hoc technique by combining photons from independent observations of BAT and IBIS. The resulting Swift-INTEGRAL X-ray (SIX) survey has an improved sourcenumber density. This improvement is essential to enhance the positive hard X-ray -gamma-ray source matches. We present the results from the scientific link between the neighboring gammaray and hard X-ray bands in the context of galactic and extragalactic source classes of the second catalog Fermi Gamma-ray LAT (2FGL).
doi:10.22323/1.236.0883 fatcat:tcdjx5zhd5eijecso3xlsyitfm