Publication Date:
2013-08-22
Description:
A deep observation campaign carried out by the High Energy Stereoscopic System (HESS) on Centaurus A enabled the discovery of -rays from the blazar 1ES 1312–423, 2° away from the radio galaxy. With a differential flux at 1 TeV of (1 TeV) = (1.9 ± 0.6 stat ± 0.4 sys ) x 10 –13 cm –2 s –1 TeV –1 corresponding to 0.5 per cent of the Crab nebula differential flux and a spectral index = 2.9 ± 0.5 stat ± 0.2 sys , 1ES 1312–423 is one of the faintest sources ever detected in the very high energy ( E 〉 100 GeV) extragalactic sky. A careful analysis using three and a half years of Fermi Large Area Telescope ( Fermi -LAT) data allows the discovery at high energies (E 〉 100 MeV) of a hard spectrum ( = 1.4 ± 0.4 stat ± 0.2 sys ) source coincident with 1ES 1312–423. Radio, optical, UV and X-ray observations complete the spectral energy distribution of this blazar, now covering 16 decades in energy. The emission is successfully fitted with a synchrotron self-Compton model for the non-thermal component, combined with a blackbody spectrum for the optical emission from the host galaxy.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
Permalink