Magnetic Hair and Reconnection in Black Hole Magnetospheres

被引：64

作者：

Bransgrove, Ashley ^{[1
,2
]}

Ripperda, Bart ^{[3
,4
]}

Philippov, Alexander ^{[3
]}

机构：

[1] Columbia Univ, Phys Dept, 538 West 120th St, New York, NY 10027 USA

[2] Columbia Univ, Columbia Astrophys Lab, 538 West 120th St, New York, NY 10027 USA

[3] Flatiron Inst, Ctr Computat Astrophys, 162 Fifth Ave, New York, NY 10010 USA

[4] Princeton Univ, Dept Astrophys Sci, Peyton Hall, Princeton, NJ 08544 USA

来源：

PHYSICAL REVIEW LETTERS | 2021年 / 127卷 / 05期

基金：

美国国家科学基金会;

关键词：

ACCRETION;

D O I：

10.1103/PhysRevLett.127.055101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The no-hair theorem of general relativity states that isolated black holes are characterized by three parameters: mass, spin, and charge. In this Letter we consider Kerr black holes endowed with highly magnetized plasma-filled magnetospheres. Using general relativistic kinetic plasma and resistive magnetohydrodynamics simulations, we show that a dipole magnetic field on the event horizon opens into a split monopole and reconnects in a plasmoid-unstable current sheet. The no-hair theorem is satisfied, in the sense that all components of the stress-energy tensor decay exponentially in time. We measure the decay time of magnetic flux on the event horizon for plasmoid-dominated reconnection in collisionless and collisional plasma. The reconnecting magnetosphere should be a powerful source of hard x-ray emission when the magnetic field is strong.

引用

页数：6

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