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标题：discovery of VHE gamma rays from RGB J0152 017
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作者：J.P. Lenain ; D. Nedbal ; M. Raue 等
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2008
卷号：2008
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The BL Lac object RGB J0152+017 (z = 0.080) was predicted to be a very high-energy (VHE; > 100GeV) g -ray source, due to its high X-ray and radio fluxes. We report recent observations of this source made in late October and November 2007 with the H.E.S.S. array consisting of four imaging atmospheric ˇCerenkov telescopes. Contemporaneous observations were made in X-rays with the Swift and RXTE satellites, in the optical band with the ATOM telescope, and in the radio band with the Nançay Radio Telescope. As a result, RGB J0152+017 is discovered as a source of VHE g -rays by H.E.S.S. A signal of 173 g -ray photons corresponding to a statistical significance of 6.6s was found in the data. The energy spectrum of the source can be described by a powerlaw with a spectral index of G = 2.95- ±0.36stat±0.20syst. The integral flux above 300GeV corresponds to ∼2% of the flux of the Crab nebula. The source spectral energy distribution (SED) can be described using a two-component (extended jet and blob in jet) non-thermal synchrotron self-Compton (SSC) leptonic model, plus a thermal host galaxy component. The parameters that are found are very close to those found for TeV blazars in similar SSC studies. The location of its synchrotron peak, as derived from the SED in Swift data, allows clear classification as a high-frequency-peaked BL Lac (HBL).