Accretion and jet power in active galactic nuclei

作     者：Luigi Foschini Luigi Foschini INAF–Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807, Merate (LC), Italy

作者机构：INAF-Osservatorio Astronomico di Brera Via E. Bianchi 46 23807 Merate (LC) Italy 

出 版 物：《Research in Astronomy and Astrophysics》 (天文和天体物理学研究（英文版）)

年 卷 期：2011年第11卷第11期

页      面：1266-1278页

核心收录：

学科分类：0709[理学-地质学] 07[理学] 08[工学] 0708[理学-地球物理学] 070401[理学-天体物理] 082503[工学-航空宇航制造工程] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 

基　　金：National Aeronautics and Space Administration 

主　　题：galaxies jets-BL Lacertae objects general-quasars general-galaxies Seyfert 

摘      要：The classical diagrams of radio loudness and jet power as a function of mass and accretion rate of the central spacetime singularity in active galactic nuclei are reanalyzed by including the data of the recently discovered powerful relativistic jets in Narrow-Line Seyfert 1 Galaxies. The results are studied in the light of the known theories of relativistic jets, indicating that, although the Blandford-Znajek mechanism is sufficient to explain the power radiated by BL Lac Objects, it falls to completely account for the power from quasars and Narrow-Line Seyfert 1 Galaxies. This favors the scenario outlined by Cavaliere ＆ D＇Elia of a composite jet, with a magnetospheric core plus a hydromagnetic component emerging when the accretion power increases and the disk becomes radiation-pressure dominated. A comparison with Galactic compact objects is also made, finding some striking similarities, indicating that since neutron stars are low-mass jet systems analogous to black holes, Narrow-Line Seyfert 1 Galaxies are low-mass counterparts of blazars.