Multi-wavelength observations of blazar AO 0235+164 in the 2008-2009 flaring state

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/100808

Title:	Multi-wavelength observations of blazar AO 0235+164 in the 2008-2009 flaring state
Authors:	陳文屏;Ackermann, M.;Bastieri, D.;Bloom, E. D.;Bonamente, E.;Borgland, A. W.;Bregeon, J.;Cameron, R. A.;Caraveo, P. A.;Casandjian, J. M.;Charles, E.;Chiang, J.;Cohen-Tanugi, J.;Cutini, S.;D'Ammando, F.;de Palma, F.;Dermer, C. D.;Drlica-Wagner, A.;Dubois, R.;Favuzzi, C.;Fegan, S. J.;Fuhrmann, L.;Fukazawa, Y.;Gargano, F.;Giommi, P.;Giordano, F.;Giroletti, M.;Glanzman, T.;Godfrey, G.;Guiriec, S.;Hadasch, D.;Katagiri, H.;Kataoka, J.;Knödlseder, J.;Lott, B.;Lovellette, M. N.;Madejski, G. M.;Mazziotta, M. N.;Mehault, J.;Michelson, P. F.;Morselli, A.;Moskalenko, I. V.;Murgia, S.;Naumann-Godo, M.;Norris, J. P.;Paneque, D.;Pesce-Rollins, M.;Porter, T. A.;Rainò, S.;Rastawicki, D.;Razzano, M.;Readhead, A.;Reimer, O.;Sbarra, C.;Sgrò, C.;Takahashi, H.;Tanaka, T.;Thayer, J. G.;Thayer, J. B.;Torres, D. F.;Troja, E.;Vandenbroucke, J.;Vitale, V.;Waite, A. P.;Winer, B. L.;Moderski, R.;Sikora, M.;Villata, M.;Raiteri, C. M.;Aller, M. F.;Berdyugin, A.;Blinov, D. A.;Bravo Calle, O. J. A.;Efimova, N. V.;Gurwell, M. A.;Hiriart, D.;Jordan, B.;Kopatskaya, E. N.;Lähteenmäki, A.;Larionova, E. G.;Morozova, D. A.;Nikolashvili, M. G.;Sigua, L. A.;Sillanpää, A.;Tornikoski, M.;Troitsky, I. S.;Umana, G.;Krichbaum, T. P.;Nestoras, I.;Riquelme, D.;Arai, A.;Kawabata, K. S.;Sakimoto, K.;Sato, S.;Yoshida, M.;Belloni, T.;Bonning, E. W.;Isler, J.;Urry, C. M.;Falcone, A.;Stroh, M.
Contributors:	理學院天文研究所
Keywords:	Astronomy;Astrophysics;BL Lacertae objects: individual (AO 0235+164);Blazars;Broadband;Earth, ocean, space;Emission;Exact sciences and technology;Flares;galaxies: active;galaxies: jets;gamma rays: galaxies;High Energy Astrophysical Phenomena;Launches;Light curve;Optical polarization;Physics;radiation mechanisms: non-thermal;Sciences of the Universe;Spectral energy distribution
Date:	2012-06-01
Issue Date:	2026-04-21 14:14:56 (UTC+8)
Publisher:	IOP Publishing Ltd.;Bristol: IOP
Abstract:	摘要： The blazar AO 0235+164 (z = 0.94) has been one of the most active objects observed by Fermi Large Area Telescope (LAT) since its launch in Summer 2008. In addition to the continuous coverage by Fermi, contemporaneous observations were carried out from the radio to gamma -ray bands between 2008 September and 2009 February. In this paper, we summarize the rich multi-wavelength data collected during the campaign (including F-GAMMA, GASPWEBT, Kanata, OVRO, RXTE, SMARTS, Swift, and other instruments), examine the cross-correlation between the light curves measured in the different energy bands, and interpret the resulting spectral energy distributions in the context of well-known blazar emission models. We find that the gamma -ray activity is well correlated with a series of near-IR/optical flares, accompanied by an increase in the optical polarization degree. On the other hand, the X-ray light curve shows a distinct 20 day high state of unusually soft spectrum, which does not match the extrapolation of the optical/UV synchrotron spectrum. We tentatively interpret this feature as the bulk Compton emission by cold electrons contained in the jet, which requires an accretion disk corona with an effective covering factor of 19% at a distance of 100 R sub(g). We model the broadband spectra with a leptonic model with external radiation dominated by the infrared emission from the dusty torus. 出版者： Bristol: IOP 出版日期： 2012-06-01 出處： The Astrophysical journal, 2012-06, Vol.751 (2), p.159-20 資源來源： IoP Science journals 版權： 2015 INIST-CNRS 版權： CC0 1.0 - Universal 識別號： ISSN: 0004-637X 識別號： ISSN: 1538-4357 識別號： EISSN: 1538-4357 識別號： DOI: 10.1088/0004-637X/751/2/159 識別號： CODEN: ASJOAB
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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