Fast TeV variability in blazars: jets in a jet

被引：412

作者：

Giannios, Dimitrios ^{[1
,2
]}

Uzdensky, Dmitri A. ^{[1
]}

Begelman, Mitchell C. ^{[3
,4
]}

机构：

[1] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[2] Max Planck Inst Astrophys, D-85741 Garching, Germany

[3] Univ Colorado, Joint Inst Lab Astrophys, Boulder, CO 80309 USA

[4] Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2009年 / 395卷 / 01期

基金：

美国国家科学基金会;

关键词：

radiation mechanisms: non-thermal; galaxies: active; BL Lacertae objects: individual: PKS 2155-304; BL Lacertae objects: individual: Mrk 501; gamma-rays: theory; RAPID VARIABILITY; FLARES; 1ES-1959+650; SIMULATIONS; EMISSION; MODEL;

D O I：

10.1111/j.1745-3933.2009.00635.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The fast TeV variability of the blazars Mrk 501 and PKS 2155-304 implies a compact emitting region that moves with a bulk Lorentz factor of Gamma(em) similar to 100 towards the observer. The Lorentz factor is clearly in excess of the jet Lorentz factors Gamma(j) less than or similar to 10 measured on sub-pc scales in these sources. We propose that the TeV emission originates from compact emitting regions that move relativistically within a jet of bulk Gamma(j) similar to 10. This can be physically realized in a Poynting flux-dominated jet. We show that if a large fraction of the luminosity of the jet is prone to magnetic dissipation through reconnection, then material outflowing from the reconnection regions can efficiently power the observed TeV flares through synchrotron-self-Compton emission. The model predicts simultaneous far-ultraviolet/soft X-ray flares.

引用

页码：L29 / L33

页数：5

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