A Structured Leptonic Jet Model of the "Orphan" TeV Gamma-Ray Flares in TeV Blazars

Abstract

The emission spectra of TeV blazars extend up to tens of TeV and the emission mechanism of the TeV $\gamma$-rays is explained by synchrotron self-Compton scattering in leptonic models. In these models the time variabilities of X-rays and TeV $\gamma$-rays are correlated. However, recent observations of 1ES 1959+650 and Mrk 421 have found the ``orphan'' TeV $\gamma$-ray flares, i.e., TeV $\gamma$-ray flares without simultaneous X-ray flares. In this paper we propose a model for the ``orphan'' TeV $\gamma$-ray flares, employing an inhomogeneous leptonic jet model. After a primary flare that accompanies flare-up both in X-rays and TeV $\gamma$-rays, radiation propagates in various directions in the comoving frame of the jet. When a dense region in the jet receives the radiation, X-rays are scattered by relativistic electrons/positrons to become TeV $\gamma$-rays. These $\gamma$-ray photons are observed as an ``orphan'' TeV $\gamma$-ray flare. The observed delay time between the primary and ``orphan'' flares is about two weeks and this is accounted for in our model for parameters such as $\Gamma =20$, $d=4\times 10^{17}$cm, $\alpha =3$, and $\eta =1$, where $\Gamma$ is the bulk Lorentz factor of the jet, $d$ is the distance between the central black hole and the primary flare site, $\alpha /\Gamma$ is the angle between the jet axis and the direction of the motion of the dense region that scatters incoming X-rays produced by the primary flare, and $\eta /\Gamma$ is the angle between the jet axis and the line of sight.

arXiv comment12page, 6 figures, accepted by ApJ

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Cited by in corpus (11)

• The Parsec-Scale Jets of the TeV Blazars H 1426+428, 1ES 1959+650, and PKS 2155-304: 2001-2004
• Mrk 421 active state in 2008: the MAGIC view, simultaneous multi-wavelength observations and SSC model constrained
• Very hard gamma-ray emission from a flare of Mrk 501
• Investigating Broadband Variability of the TeV Blazar 1ES 1959+650
• Baryon Loading Efficiency and Particle Acceleration Efficiency of Relativistic Jets: Cases For Low Luminosity BL Lacs
• Multi-TeV flaring from blazars: Markarian 421 a case study
• The Study of TeV Variability and Duty Cycle of Mrk 421 from 3 Years of Observations with the Milagro Observatory
• A fully-kinetic model for orphan gamma-ray flares in blazars
• CANGAROO-III Observations of the 2006 Outburst of PKS2155-304
• Could a plasma in quasi-thermal equilibrium be associated to the "orphan" TeV flares ?
• A Ring of Fire Orphan γ-Ray Flare in the Neutrino Candidate 3C 120