HESS and Fermi-LAT discovery of γ-rays from the blazar 1ES 1312-423
Abstract
A deep observation campaign carried out by the High Energy Stereoscopic System (HESS) on Centaurus A enabled the discovery of γ-rays from the blazar 1ES 1312-423, 2° away from the radio galaxy. With a differential flux at 1 TeV of φ(1 TeV) = (1.9 ± 0.6stat ± 0.4sys) × 10-13 cm-2 s-1 TeV-1 corresponding to 0.5 per cent of the Crab nebula differential flux and a spectral index Γ = 2.9 ± 0.5stat ± 0.2sys, 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 (Γ = 1.4 ± 0.4stat ± 0.2sys) 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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- September 2013
- DOI:
- 10.1093/mnras/stt1081
- arXiv:
- arXiv:1306.3186
- Bibcode:
- 2013MNRAS.434.1889H
- Keywords:
-
- radiation mechanisms: non-thermal;
- galaxies: active;
- BL Lacertae objects: individual: 1ES 1312-423;
- galaxies: jets;
- gamma-rays: galaxies;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 12 pages, 10 figures, accepted in MNRAS