RESOLVING DOPPLER-FACTOR CRISIS IN ACTIVE GALACTIC NUCLEI: NON-STEADY MAGNETIZED OUTFLOWS

被引：41

作者：

Lyutikov, Maxim ^{[1
]}

Lister, Matthew ^{[1
]}

机构：

[1] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA

来源：

ASTROPHYSICAL JOURNAL | 2010年 / 722卷 / 01期

基金：

美国国家科学基金会;

关键词：

galaxies: active; galaxies: jets; gamma rays: general; GAMMA-RAY EMISSION; RADIO-SOURCES; TEV BLAZARS; ENERGY-DISTRIBUTION; RELATIVISTIC JETS; SOURCE CATALOG; FR-I; MOJAVE; MARKARIAN-501; ACCELERATION;

D O I：

10.1088/0004-637X/722/1/197

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Magnetically driven non-stationary acceleration of jets in active galactic nuclei results in the leading parts of the flow being accelerated to much higher Lorentz factors than in the case of steady-state acceleration with the same parameters. The higher Doppler-boosted parts of the flow may dominate the high-energy emission of blazar jets. We suggest that highly variable GeV and TeV emission in blazars is produced by the faster moving leading edges of highly magnetized non-stationary ejection blobs, while the radio data trace the slower-moving bulk flow. Thus, the radio and gamma-ray emission regions have different, but correlated, Doppler factors. High-energy emission is generated, typically within the optically thick core, in the outer parts of the broad-line emission region, avoiding the radiative drag on the faster parts of the flow. The radio emission should correlate with the gamma-ray emission, delayed with frequency-dependent time lag of the order of weeks to months. Model predictions compare favorably with the latest Fermi gamma-ray and MOJAVE radio very long baseline interferometry results.

引用

页码：197 / 203

页数：7

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