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Aharonian, F.; Akhperjanian, A.G.; Bazer-Bachi, A.R.; Behera, B.; Beilicke, M.; Benbow, W.; Berge, D.; Bernlöhr, K.; Boisson, C.; Bolz, O.; Borrel, V.; Braun, I.; Brion, E.; Brown, A.M.; Bühler, R.; Bulik, T.; Büsching, I.; Boutelier, T.; Carrigan, S.; Chadwic, P.M.; Chounet, L.-M.; Clapson, A.C.; Coignet, G.; Cornils, R.; Costamante, L.; Degrange, B.; Dickinson, H.J.; Djannati-Ataï, A.; Domainko, W.; Drury, L.O'C.; Dubus, G.; Dyks, J.; Egberts, K.; Emmanoulopoulos, D.; Espigat, P.; Farnier, C.; Feinstein, F.; Fiasson, A.; F¨orster, A.; Fontaine, G.; Fukui, Y.; Funk, Seb; Funk, S.; Füssling, M.; Gallant, Y.A.; Giebels, B.; Glicenstein, J.F.; Glück, B.; Goret, P.; Hadjichristidis, C.; Hauser, D.; Hauser, M.; Heinzelmann, G.; Henri, G.; Hermann, G.; Hinton, J.A.; Hoffmann, A.; Hofmann, W.; Holleran, M.; Hoppe, S.; Horns, D.; Jacholkowska, A.; de Jager, O.C.; Kendziorra, E.; Kerschhagg, M.; Khélifi, B.; Komin, Nu; Kosack, K.; Lamanna, G.; Latham, I.J.; Le Gallou, R.; Lemière, A.; Lemoine-Goumard, M.; Lenain, J.-P.; Lohse, T.; Martin, J.M.; Martineau-Huynh, O.; Marcowith, A.; Masterson, C.; Maurin, G.; Mccomb, T.J.L.; Moderski, R.; Moriguchi, Y.; Moulin, Emmanuel; de Naurois, M.; Nedbal, D.; Nolan, S.J.; Olive, J.-P.; Orford, K.J.; Osborne, J.L.; Ostrowski, M.; Panter, M.; Pedaletti, G.; Pelletier, G.; Petrucci, P.-O.; Pita, S.; P¨uhlhofer, G.; Punch, M.; Ranchon, S.; Raubenheimer, B.C.
Astronomy and astrophysics (Berlin), 02/2008, Letnik: 481Journal Article
Aims: The BL Lac object RGB J0152+017 (z=0.080) was predicted to be a very high-energy (VHE; > 100 GeV) gamma-ray source, due to its high X-ray and radio fluxes. Our aim is to understand the radiative processes by investigating the observed emission and its production mechanism using the High Energy Stereoscopic System (H.E.S.S.) experiment. Methods: We report recent observations of the BL Lac source RGB J0152+017 made in late October and November 2007 with the H.E.S.S. array consisting of four imaging atmospheric Cherenkov telescopes. Contemporaneous observations were made in X-rays by the Swift and RXTE satellites, in the optical band with the ATOM telescope, and in the radio band with the Nancay Radio Telescope. Results: A signal of 173 gamma-ray photons corresponding to a statistical significance of 6.6 sigma was found in the data. The energy spectrum of the source can be described by a powerlaw with a spectral index of 2.95+/-0.36stat+/-0.20syst. The integral flux above 300 GeV corresponds to ~2% of the flux of the Crab nebula. The source spectral energy distribution (SED) can be described using a two-component non-thermal synchrotron self-Compton (SSC) leptonic model, except in the optical band, which is dominated by a thermal host galaxy component. The parameters that are found are very close to those found in similar SSC studies in TeV blazars. Conclusions: RGB J0152+017 is discovered as a source of VHE gamma-rays by H.E.S.S. The location of its synchrotron peak, as derived from the SED in Swift data, allows clearly classification it as a high-frequency-peaked BL Lac (HBL).
