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HESS and Fermi-LAT discovery of gamma-rays from the blazar 1ES 1312-423
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2013 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 434, no 3, 1889-1901 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2013. Vol. 434, no 3, 1889-1901 p.
Keyword [en]
radiation mechanisms: non-thermal, galaxies: active, BL Lacertae objects: individual: 1ES 1312-423, galaxies: jets, gamma-rays: galaxies
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-94182DOI: 10.1093/mnras/stt1081ISI: 000323639900006OAI: diva2:652594
HESS Collaboration


Funding Agencies:

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 

Available from: 2013-10-01 Created: 2013-09-30 Last updated: 2013-11-28Bibliographically approved

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Conrad, JanDickinson, Hugh J.Farnier, Christian
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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