Magnetic Neutral Points and Electric Lines of Force in Strong Gravity of a Rotating Black Hole

• 作者: D. Kunneriath O. Kopá?ek V. Karas
• 来源期刊: 天文学与天体物理学国际期刊(英文)
• 学科: 地球科学
• 关键词: Galaxies: NUCLEI Galaxy: Center Black Hole PHYSICS MAGNETIC FIELDS
• 年，卷（期）: 2013,（3）
• 页码范围: 18-24
• 页数: 7页
• 分类号: P1

摘要

Magnetic field can be amplified and twisted near a supermassive black hole residing in a galactic nucleus. At the same time magnetic null points develop near the horizon. We examine a large-scale oblique magnetic field near a rotating (Kerr) black hole as an origin of magnetic layers, where the field direction changes abruptly in the ergosphere region. In consequence of this, magnetic null points can develop by purely geometrical effects of the strong gravitational field and the frame-dragging mechanism. We identify magnetic nulls as possible sites of magnetic reconnection and suggest that particles may be accelerated efficiently by the electric component. The situation we discuss is relevant for starving nuclei of some galaxies which exhibit episodic accretion events, namely, Sagittarius A* black hole in our Galaxy.