Kerr geodesics, the Penrose process and jet collimation by a black hole

被引：29

作者：

Gariel, J. ^{[1
]}

MacCallum, M. A. H. ^{[2
]}

Marcilhacy, G. ^{[1
]}

Santos, N. O. ^{[1
,2
,3
]}

机构：

[1] Univ Paris 06, LERMA, Observ Paris, CNRS,UMR 8112, F-94200 Ivry, France

[2] Univ London, Sch Math Sci, London E1 4NS, England

[3] Lab Nacl Computacao Cient, BR-25651070 Petropolis, RJ, Brazil

来源：

ASTRONOMY & ASTROPHYSICS | 2010年 / 515卷

基金：

英国工程与自然科学研究理事会;

关键词：

black hole physics; acceleration of particules; relativistic processes; SUBRELATIVISTIC JETS; ACCRETION VORTICES; ACCELERATION; EMISSION; DYNAMICS; ENERGY; MOTION;

D O I：

10.1051/0004-6361/200913678

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. We re-examine the possibility that astrophysical jet collimation may arise from the geometry of rotating black holes and the presence of high-energy particles resulting from a Penrose process, without the help of magnetic fields. Methods. Our analysis uses the Weyl coordinates, which are revealed better adapted to the desired shape of the jets. We numerically integrate the 2D-geodesics equations. Results. We give a detailed study of these geodesics and give several numerical examples. Among them are a set of perfectly collimated geodesics with asymptotes rho = rho(1) parallel to the z-axis, with rho(1) only depending on the ratios Q/E-2-1 and a/M, where a and M are the parameters of the Kerr black hole, E the particle energy and Q the Carter's constant.

引用

页数：9

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