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Multifrequency Studies of the Peculiar Quasar 4C +21.35 During the 2010 Flaring Activity

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Multifrequency Studies of the Peculiar Quasar 4C +21.35 During the 2010 Flaring Activity

dc.contributor.author	The Fermi Large Area Telescope Collaboration
dc.contributor.author	The MAGIC Collaboration
dc.contributor.author	Aller, M. F.
dc.contributor.author	Angelakis, E.
dc.contributor.author	Blinov, D.A.
dc.contributor.author	Djorgovski, S.G.
dc.contributor.author	Drake, A.J.
dc.contributor.author	Efimova, N.V.
dc.contributor.author	Gurwell, M.A.
dc.contributor.author	Homan, D.C.
dc.contributor.author	Jordan, B.
dc.contributor.author	Kopatskaya, E.N.
dc.contributor.author	Kovalev, Yuri Y.
dc.contributor.author	Kurtanidze, O.M.
dc.contributor.author	Lähteenmäki, A.
dc.contributor.author	Larionov, V.M.
dc.contributor.author	Lister, Matthiew L.
dc.contributor.author	Nieppola, E.
dc.contributor.author	Nikolashvili, M.G.
dc.contributor.author	Ros Ibarra, Eduardo
dc.contributor.author	Savolainen, Tuomas
dc.contributor.author	Sigua, L.A.
dc.contributor.author	Tornikoski, M.
dc.date.accessioned	2017-07-11T14:18:38Z
dc.date.available	2017-07-11T14:18:38Z
dc.date.issued	2014
dc.identifier.citation	The Fermi Large Area Telescope Collaboration The MAGIC Collaboration Aller, M. F. Angelakis, E. Blinov, D.A. Djorgovski, S.G. Drake, A.J. Efimova, N.V. Gurwell, M.A. Homan, D.C. Jordan, B. Kopatskaya, E.N. Kovalev, Yuri Y. Kurtanidze, O.M. Lähteenmäki, A. Larionov, V.M. Lister, Matthiew L. Nieppola, E. Nikolashvili, M.G. Ros Ibarra, Eduardo Savolainen, Tuomas Sigua, L.A. Tornikoski, M. 2014 Multifrequency Studies of the Peculiar Quasar 4C +21.35 During the 2010 Flaring Activity Astrophysical Journal 786 157 1 17
dc.identifier.uri	http://hdl.handle.net/10550/59461
dc.description.abstract	The discovery of Very High Energy (VHE; E > 100 GeV) γ-ray emission from 4C +21.35 (PKS 1222+216) by MAGIC on 2010 June 17, triggered by the high activity detected by the Fermi Large Area Telescope (LAT) in high energy (HE) γ-rays, poses intriguing questions on the location of the γ-ray emitting region in this flat spectrum radio quasar (FSRQ). We present multifrequency data of 4C +21.35 collected from radio to VHE during 2010 for investigating the properties of this source and discussing a possible emission model. The first hint of detection at VHE was observed by MAGIC on 2010 May 3, soon after a γ-ray flaring activity detected by Fermi-LAT and peaking on April 29. The same emission mechanism may therefore be responsible for both the HE and VHE emission during the 2010 flaring episodes. Two optical peaks were detected on 2010 April 20 and June 30, close in time but not simultaneous with the two γ-ray peaks, while no clear correlation was observed between the X-ray and γ-ray emission. An increasing flux density was observed in radio and mm bands from the beginning of 2009, in accordance with the increasing γ-ray activity observed by Fermi-LAT, and peaking on 2011 January 27 at 230 GHz. We model the spectral energy distributions (SEDs) of 4C +21.35 for the two periods of the VHE detection and a quiescent state with a one-zone model considering the emission from a very compact region outside the broad line region. The three SEDs could be fit with a combination of synchrotron self-Compton and external Compton emission of seed photons from a dust torus, changing only the electron distribution parameters among the SEDs. The fit of the optical/UV part of the spectrum for 2010 April 29 seems to favor an inner disk radius of 3 gravitational radii, a value expected for a maximally prograde rotating Kerr black hole.
dc.language.iso	eng
dc.relation.ispartof	Astrophysical Journal, 2014, vol. 786, num. 157, p. 1-17
dc.subject	Astrofísica
dc.subject	Astronomia Observacions
dc.title	Multifrequency Studies of the Peculiar Quasar 4C +21.35 During the 2010 Flaring Activity
dc.type	journal article	es_ES
dc.date.updated	2017-07-11T14:18:40Z
dc.identifier.doi	10.1088/0004-637X/786/2/157
dc.identifier.idgrec	092411
dc.rights.accessRights	open access	es_ES