Relativistic Jets from Active Galactic Nuclei

被引：578

作者：

Blandford, Roger ^{[1
]}

Meier, David ^{[2
,3
]}

Readhead, Anthony ^{[4
]}

机构：

[1] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA

[2] CALTECH, Dept Astron, Pasadena, CA 91125 USA

[3] Jet Prop Lab, Pasadena, CA 91109 USA

[4] CALTECH, Owens Valley Radio Observ, Pasadena, CA 91125 USA

来源：

ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS, VOL 57, 2019 | 2019年 / 57卷

关键词：

active galactic nuclei; black holes; jets; extragalactic radio sources; gamma-ray sources; blazars; SUPERMASSIVE BLACK-HOLES; QUASI-STELLAR SOURCES; GAMMA-RAY FLARES; BL-LAC OBJECTS; X-RAY; RADIO-SOURCES; NUMERICAL SIMULATIONS; ACCRETION FLOWS; MAGNETOHYDRODYNAMIC SIMULATIONS; SCALE STRUCTURE;

D O I：

10.1146/annurev-astro-081817-051948

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The nuclei of most normal galaxies contain supermassive black holes, which can accrete gas through a disk and become active. These active galactic nuclei (AGNs) can form jets that are observed on scales from astronomical units to megaparsecs and from meter wavelengths to TeV energies. High-resolution radio imaging and multiwavelength/messenger campaigns are elucidating the conditions under which this happens. Evidence is presented that: Relativistic AGN jets are formed when the black hole spins and the the accretion disk is strongly magnetized, perhaps on account of gas accreting at high latitude beyond the black hole sphere of influence. AGN jets are collimated close to the black hole by magnetic stress associated with a disk wind. Higher-power jets can emerge from their galactic nuclei in a relativistic, supersonic, and proton-dominated state, and they terminate in strong, hot spot shocks; lower-power jets are degraded to buoyant plumes and bubbles. Jets may accelerate protons to EeV energies, which contribute to the cosmic ray spectrum and may initiate pair cascades that can efficiently radiate synchrotron gamma-rays. Jets were far more common when the Universe was a few billion years old and black holes and massive galaxies were growing rapidly. Jets can have a major influence on their environments, stimulating and limiting the growth of galaxies. The observational prospects for securing our understanding of AGN jets are bright.

引用

页码：467 / 509

页数：43

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