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Title:
Powerful High-energy Emission of the Remarkable BL Lac Object S5 0716+714
Authors:
Vittorini, V.; Tavani, M.; Paggi, A.; Cavaliere, A.; Bulgarelli, A.; Chen, A. W.; D'Ammando, F.; Donnarumma, I.; Giuliani, A.; Longo, F.; Pacciani, L.; Pucella, G.; Vercellone, S.; Ferrari, A.; Colafrancesco, S.; Giommi, P.
Affiliation:
AA(CIFS-Torino, Viale Settimio Severo 3, I-10133, Torino, Italy ), AB(INAF/IASF-Roma, Via del Fosso del Cavaliere 100, I-00133 Roma, Italy ), AC(University of Rome, "Tor Vergata," Via della Ricerca Scientifica 1, I-00133 Roma, Italy ), AD(University of Rome, "Tor Vergata," Via della Ricerca Scientifica 1, I-00133 Roma, Italy ), AE(INAF/IASF-Bologna, Via Gobetti 101, I-40129 Bologna, Italy ), AF(CIFS-Torino, Viale Settimio Severo 3, I-10133, Torino, Italy ), AG(INAF/IASF-Roma, Via del Fosso del Cavaliere 100, I-00133 Roma, Italy ; University of Rome, "Tor Vergata," Via della Ricerca Scientifica 1, I-00133 Roma, Italy ), AH(INAF/IASF-Roma, Via del Fosso del Cavaliere 100, I-00133 Roma, Italy ), AI(INAF/IASF-Milano, Via E. Bassini 15, I-20133 Milano, Italy ), AJ(INFN-Trieste, Via Valerio 2, I-34127 Trieste, Italy ), AK(INAF/IASF-Roma, Via del Fosso del Cavaliere 100, I-00133 Roma, Italy ), AL(INAF/IASF-Roma, Via del Fosso del Cavaliere 100, I-00133 Roma, Italy ), AM(INAF/IASF-Milano, Via E. Bassini 15, I-20133 Milano, Italy ), AN(CIFS-Torino, Viale Settimio Severo 3, I-10133, Torino, Italy ), AO(ASDC c/o ESRIN, Via G. Galilei snc, I-00044 Frascati, Roma, Italy), AP(ASDC c/o ESRIN, Via G. Galilei snc, I-00044 Frascati, Roma, Italy)
Publication:
The Astrophysical Journal, Volume 706, Issue 2, pp. 1433-1437 (2009). (ApJ Homepage)
Publication Date:
12/2009
Origin:
IOP
ApJ Keywords:
BL Lacertae objects: individual: S5 0716+714, gamma rays: observations
DOI:
10.1088/0004-637X/706/2/1433
Bibliographic Code:
2009ApJ...706.1433V

Abstract

BL Lac objects of the intermediate subclass (IBLs) are known to emit a substantial fraction of their power in the energy range 0.1-10 GeV. Detecting γ-ray emission from such sources provides therefore a direct probe of the emission mechanisms and of the underlying powerhouse. The γ-ray satellite, AGILE, detected the remarkable IBL S5 0716+714 (z sime 0.3) during a high state in the period from 2007 September-October, marked by two very intense flares reaching peak fluxes of 200 × 10–8 photons cm–2 s–1 above 100 MeV, with simultaneous optical and X-ray observations. We present here a theoretical model for the two major flares and discuss the overall energetics of the source. We conclude that 0716+714 is among the brightest BL Lac's ever detected at γ-ray energies. Because of its high power and lack of signs for ongoing accretion or surrounding gas, the source is an ideal candidate to test the maximal power extractable from a rotating supermassive black hole via the pure Blandford-Znajek (BZ) mechanism. We find that during the 2007 γ-ray flares 0716+714 approached or just exceeded the upper limit set by BZ for a black hole of mass 109 M sun.
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