期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 434, 期 3, 页码 1889-1901出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt1081
关键词
radiation mechanisms: non-thermal; galaxies: active; BL Lacertae objects: individual: 1ES 1312-423; galaxies: jets; gamma-rays: galaxies
资金
- German Ministry for Education and Research (BMBF)
- Max Planck Society
- French Ministry for Research
- CNRS-IN2P3
- Astroparticle Interdisciplinary Programme of the CNRS
- UK Particle Physics and Astronomy Research Council (PPARC)
- IPNP of the Charles University
- South African Department of Science and Technology
- National Research Foundation
- University of Namibia
- Istituto Nazionale di Astrofisica in Italy
- Centre National d'Etudes Spatiales in France
- Commonwealth of Australia
- NASA [NNH09ZDA001N]
- NASA post-doctoral Programme at the Goddard Space Flight Center
- Science and Technology Facilities Council [ST/K000861/1, ST/J00426X/1 CTA, ST/I001573/1, PP/E001319/1] Funding Source: researchfish
A deep observation campaign carried out by the High Energy Stereoscopic System (HESS) on Centaurus A enabled the discovery of gamma-rays from the blazar 1ES 1312-423, 2 degrees away from the radio galaxy. With a differential flux at 1 TeV of phi(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 Gamma = 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 (Gamma = 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.
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