Multi-wavelength observations of 3C 279 during the extremely bright gamma-ray flare in 2014 March-April
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In this article, a one zone leptonic emission model is used to reproduce the 2014 gamma-ray outburst in 3C 279, and the authors conclude that the location of the emission region cannot be far out from the broad line region (BLR) and contributions from both BLR and torus photons are required to explain the observed γ-ray spectrum.Abstract:
The well studied blazar 3C 279 underwent a giant $\gamma$-ray outburst in 2014 March-April. The measured $\gamma$-ray flux (1.21 $\pm$ 0.10 $\times$ 10$^{-5}$ ph cm$^{-2}$ s$^{-1}$ in 0.1-300 GeV energy range) is the highest detected from 3C 279 by Fermi Large Area Telescope. Hour scale $\gamma$-ray flux variability are observed, with a flux doubling time as short as 1.19 $\pm$ 0.36 hours detected during one flare. The $\gamma$-ray spectrum is found to be curved at peak of the flare suggesting low probability of detecting very high energy (VHE; E $>$ 100 GeV) emission, which is further confirmed by the Very Energetic Radiation Imaging Telescope Array System observations. The $\gamma$-ray flux increased by more than an order in comparison to low activity state and the flare consists of multiple sub-structures having fast rise and slow decay profile. The flux enhancement is seen in all the wavebands though at a lesser extent compared to $\gamma$-rays. During the flare, a considerable amount of the kinetic jet power gets converted to $\gamma$-rays and the jet becomes radiatively efficient. A one zone leptonic emission model is used to reproduce the flare and we find increase in the bulk Lorentz factor as a major cause of the outburst. From the observed fast variability, lack of VHE detection, and the curved $\gamma$-ray spectrum, we conclude that the location of the emission region cannot be far out from the broad line region (BLR) and contributions from both BLR and torus photons are required to explain the observed $\gamma$-ray spectrum.read more
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Journal ArticleDOI
MINUTE-TIMESCALE >100 MeV γ-RAY VARIABILITY during the GIANT OUTBURST of QUASAR 3C 279 OBSERVED by FERMI-LAT in 2015 June
Markus Ackermann,Richard Anantua,Katsuaki Asano,Luca Baldini,Luca Baldini,Guido Barbiellini,Guido Barbiellini,Denis Bastieri,Denis Bastieri,J. Becerra González,J. Becerra González,Ronaldo Bellazzini,Elisabetta Bissaldi,Roger Blandford,Elliott D. Bloom,R. Bonino,R. Bonino,Eugenio Bottacini,P. Bruel,R. Buehler,G. A. Caliandro,R. A. Cameron,M. Caragiulo,M. Caragiulo,P. A. Caraveo,E. Cavazzuti,Claudia Cecchi,C. C. Cheung,James Chiang,G. Chiaro,Stefano Ciprini,Stefano Ciprini,Johann Cohen-Tanugi,F. Costanza,S. Cutini,S. Cutini,Filippo D'Ammando,Filippo D'Ammando,F. de Palma,R. Desiante,R. Desiante,Seth Digel,N. Di Lalla,M. Di Mauro,L. Di Venere,L. Di Venere,Persis S. Drell,C. Favuzzi,C. Favuzzi,S. J. Fegan,Elizabeth C. Ferrara,Yasushi Fukazawa,S. Funk,P. Fusco,F. Gargano,Dario Gasparrini,Dario Gasparrini,Nicola Giglietto,Nicola Giglietto,Francesco Giordano,Francesco Giordano,Marcello Giroletti,I. A. Grenier,I. A. Grenier,Lucas Guillemot,Sylvain Guiriec,M. Hayashida,E. Hays,D. Horan,G. Jóhannesson,S. Kensei,Daniel Kocevski,M. Kuss,G. La Mura,Stefan Larsson,Luca Latronico,J. Li,Francesco Longo,Francesco Longo,F. Loparco,B. Lott,M. N. Lovellette,P. Lubrano,G. M. Madejski,J. D. Magill,S. Maldera,Alberto Manfreda,M. Mayer,Mn Mazziotta,P. F. Michelson,Nestor Mirabal,Tsunefumi Mizuno,M. E. Monzani,A. Morselli,Igor V. Moskalenko,Krzysztof Nalewajko,Matteo Negro,Matteo Negro,E. Nuss,T. Ohsugi,E. Orlando,David Paneque,David Paneque,J. S. Perkins,Melissa Pesce-Rollins,Melissa Pesce-Rollins,F. Piron,G. Pivato,T. A. Porter,Giacomo Principe,Riccardo Rando,Riccardo Rando,M. Razzano,Soebur Razzaque,A. Reimer,Jeffrey D. Scargle,Carmelo Sgrò,M. Sikora,D. Simone,E. J. Siskind,F. Spada,P. Spinelli,Lukasz Stawarz,J. B. Thayer,D. J. Thompson,Diego F. Torres,Diego F. Torres,E. Troja,E. Troja,Yasunobu Uchiyama,Yajie Yuan,Shanta M. Zimmer +131 more
TL;DR: In this article, the authors observed minute-scale variability suggests a very compact emission region at hundreds of Schwarzschild radii from the central engine in conical jet models, where a minimum bulk jet Lorentz factor of 35 is necessary to avoid both internal gamma-ray absorption and super-Eddington jet power.
Journal ArticleDOI
Rapid Variability of Blazar 3C 279 During Flaring States in 2013-2014 with Joint Fermi-LAT, NuSTAR, Swift, and Ground-Based Multi-Wavelength Observations
M. Hayashida,Krzysztof Nalewajko,G. M. Madejski,M. Sikora,Ryosuke Itoh,Marco Ajello,Roger Blandford,S. Buson,S. Buson,James Chiang,Yasushi Fukazawa,A. K. Furniss,C. M. Urry,Imran Hasan,Fiona A. Harrison,David M. Alexander,Mislav Baloković,Didier Barret,Didier Barret,Steven E. Boggs,Finn Erland Christensen,W. W. Craig,W. W. Craig,K. Forster,Paolo Giommi,Brian W. Grefenstette,C. J. Hailey,Allan Hornstrup,Takao Kitaguchi,Jason E. Koglin,K. K. Madsen,Peter H. Mao,Hiromasa Miyasaka,Kaya Mori,M. Perri,M. Perri,Michael J. Pivovaroff,Simonetta Puccetti,Simonetta Puccetti,Vikram Rana,D. Stern,Gianpiero Tagliaferri,Niels Jørgen Stenfeldt Westergaard,W. W. Zhang,Andreas Zoglauer,Mark Gurwell,Makoto Uemura,Hiroshi Akitaya,Koji S. Kawabata,K. Kawaguchi,Yuka Kanda,Yuki Moritani,Katsutoshi Takaki,Takahiro Ui,Michitoshi Yoshida,Aditi Agarwal,Alok C. Gupta +56 more
TL;DR: The results of a multiband observing campaign on the famous blazar 3C 279 conducted during a phase of increased activity from 2013 December to 2014 April, including first observations of it with NuSTAR were reported in this paper.
Journal ArticleDOI
Rapid Variability of Blazar 3C 279 during Flaring States in 2013-2014 with Joint Fermi-LAT, NuSTAR, Swift, and Ground-Based Multi-wavelength Observations
M. Hayashida,Krzysztof Nalewajko,G. M. Madejski,M. Sikora,R. Itoh,Marco Ajello,Roger Blandford,Sara Buson,James Chiang,Yasushi Fukazawa,Amy Furniss,C. M. Urry,Imran Hasan,Fiona A. Harrison,David M. Alexander,Mislav Baloković,Didier Barret,Steven E. Boggs,F. E. Christensen,William W. Craig,K. Forster,P. Giommi,Brian W. Grefenstette,C. J. Hailey,Allan Hornstrup,Takao Kitaguchi,Jason E. Koglin,K. K. Madsen,Peter H. Mao,Hiromasa Miyasaka,Kaya Mori,M. Perri,Michael J. Pivovaroff,Simonetta Puccetti,V. Rana,D. Stern,G. Tagliaferri,N. J. Westergaard,W. W. Zhang,Andreas Zoglauer,Mark Gurwell,Makoto Uemura,Hiroshi Akitaya,Koji S. Kawabata,K. Kawaguch,Yuka Kanda,Y. Moritani,Katsutoshi Takaki,Takahiro Ui,Michitoshi Yoshida,Aditi Agarwal,Alok C. Gupta +51 more
TL;DR: In this article, the authors report the results of a multi-band observing campaign on the famous blazar 3C 279 conducted during a phase of increased activity from 2013 December to 2014 April, including first observations of it with NuSTAR.
The Structure and Emission Model of the Relativistic Jet in the Quasar 3C 279 Inferred From Radio To High-Energy Gamma-Ray Observations in 2008-2010
TL;DR: In this paper, the authors present time-resolved broad-band observations of the quasar 3C 279 obtained from multi-wavelength campaigns conducted during the first two years of the Fermi Gamma-ray Space Telescope mission.
Journal ArticleDOI
Multi-Wavelength Intra-Day Variability and Quasi-Periodic Oscillation in Blazars
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