Exceptional outburst of the blazar CTA 102 in 2012: The GASP-WEBT campaign and its extension

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/102028

Title:	Exceptional outburst of the blazar CTA 102 in 2012: The GASP-WEBT campaign and its extension
Authors:	柯伊娜;Larionov, V. M.;Villata, M.;Raiteri, C. M.;Jorstad, S. G.;Marscher, A. P.;Agudo, I.;Smith, P. S.;Acosta-Pulido, J. A.;˙arévalo, M. J.;Arkharov, A. A.;Bachev, R.;Blinov, D. A.;Borisov, G.;Borman, G. A.;Bozhilov, V.;Bueno, A.;Carnerero, M. I.;Carosati, D.;Casadio, C.;Chen, W. P.;Clemens, D. P.;Di Paola, A.;Ehgamberdiev, Sh. A.;Gómez, J. L.;González-Morales, P. A.;Griñón-Marín, A.;Grishina, T. S.;Hagen-Thorn, V. A.;Ibryamov, S.;Itoh, R.;Joshi, M.;Kopatskaya, E. N.;Koptelova, E.;Lázaro, C.;Larionova, E. G.;Larionova, L. V.;Manilla-Robles, A.;Metodieva, Y.;Milanova, Yu. V.;Mirzaqulov, D. O.;Molina, S. N.;Morozova, D. A.;Nazarov, S. V.;Ovcharov, E.;Peneva, S.;Ros, J. A.;Sadun, A. C.;Savchenko, S. S.;Semkov, E.;Sergeev, S. G.;Strigachev, A.;Troitskaya, Yu. V.;Troitsky, I. S.
Contributors:	理學院天文研究所
Keywords:	Blazars;Doppler effect;Emission;Emissions;Fluxes;Frequencies;Mathematical models;Outbursts;Stokes parameters;Synchrotrons;Ultraviolet radiation;X-ray astronomy
Date:	2016-09-21
Issue Date:	2026-04-21 14:57:18 (UTC+8)
Publisher:	Oxford University Press;London: Oxford University Press
Abstract:	摘要： After several years of quiescence, the blazar CTA 102 underwent an exceptional outburst in 2012 September–October. The flare was tracked from γ-ray to near-infrared (NIR) frequencies, including Fermi and Swift data as well as photometric and polarimetric data from several observatories. An intensive Glast-Agile support programme of the Whole Earth Blazar Telescope (GASP–WEBT) collaboration campaign in optical and NIR bands, with an addition of previously unpublished archival data and extension through fall 2015, allows comparison of this outburst with the previous activity period of this blazar in 2004–2005. We find remarkable similarity between the optical and γ-ray behaviour of CTA 102 during the outburst, with a time lag between the two light curves of ≈1 h, indicative of cospatiality of the optical and γ-ray emission regions. The relation between the γ-ray and optical fluxes is consistent with the synchrotron self-Compton (SSC) mechanism, with a quadratic dependence of the SSC γ-ray flux on the synchrotron optical flux evident in the post-outburst stage. However, the γ-ray/optical relationship is linear during the outburst; we attribute this to changes in the Doppler factor. A strong harder-when-brighter spectral dependence is seen both the in γ-ray and optical non-thermal emission. This hardening can be explained by convexity of the UV–NIR spectrum that moves to higher frequencies owing to an increased Doppler shift as the viewing angle decreases during the outburst stage. The overall pattern of Stokes parameter variations agrees with a model of a radiating blob or shock wave that moves along a helical path down the jet. 出版者： London: Oxford University Press 出版日期： 2016-09-21 出處： Monthly notices of the Royal Astronomical Society, 2016-09, Vol.461 (3), p.3047-3056 資源來源： Alma/SFX Local Collection 版權： 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society 2016 版權： Copyright Oxford University Press, UK Sep 21, 2016 識別號： ISSN: 0035-8711 識別號： ISSN: 1365-8711 識別號： ISSN: 1365-2966 識別號： EISSN: 1365-2966 識別號： DOI: 10.1093/mnras/stw1516
Appears in Collections:	[Graduate Institute of Astronomy] journal & Dissertation

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