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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Probing the transition between the synchrotron and inverse-compton spectral components of 1ES 1959+650
Astrophysical Journal Letters, Volume 719, No. 2 PART 2, Year 2010
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Description
1ES 1959+650 is one of the most remarkable high-peaked BL Lacertae objects (HBL). In 2002, it exhibited a TeV γ -ray flare without a similar brightening of the synchrotron component at lower energies. This orphan TeV flare remained a mystery. We present the results of a multifrequency campaign, triggered by the INTEGRAL IBIS detection of 1ES 1959+650. Our data range from the optical to hard X-ray energies, thus covering the synchrotron and inverse-Compton components simultaneously. We observed the source with INTEGRAL, the Swift X-Ray Telescope, and the UV-Optical Telescope, and nearly simultaneously with a ground-based optical telescope. The steep spectral component at X-ray energies is most likely due to synchrotron emission, while at soft γ -ray energies the hard spectral index may be interpreted as the onset of the high-energy component of the blazar spectral energy distribution (SED). This is the first clear measurement of a concave X-ray-soft γ -ray spectrum for an HBL. The SED can be well modeled with a leptonic synchrotron self-Compton model. When the SED is fitted this model requires a very hard electron spectral index of q ∼ 1.85, possibly indicating the relevance of second-order Fermi acceleration. © 2010. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Bottacini, Eugenio
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Boettcher, M.
United States, Athens
Ohio University
Schady, Patricia
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Rau, Arne
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Zhang, Xiaoling
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Ajello, Marco
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Fendt, Christian
Germany, Heidelberg
Max Planck Institute for Astronomy
Greiner, Jochen
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Statistics
Citations: 13
Authors: 8
Affiliations: 4
Identifiers
Doi:
10.1088/2041-8205/719/2/L162
ISSN:
20418205
Research Areas
Environmental