Universität zu Köln

Karas, V., Kopacek, O., Kunneriath, D., Zajacek, M., Araudo, A., Eckart, A. and Kovar, J. (2017). Plunging neutron stars as origin of organised magnetic field in galactic nuclei. Contrib. Astron. Obs. S., 47 (2). S. 124 - 133. TATRANSKA LOMINICA: SLOVAK ACADEMY SCIENCES ASTRONOMICAL INST. ISSN 1336-0337

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Abstract

Black holes cannot support their own internal magnetic field like, for example, compact stars can. Despite this fact observations indicate that event horizons of supermassive black holes (SMBH) are threaded by field lines along which plasma streams flow. Various magnetohydrodynamical mechanisms have been suggested to generate turbulent magnetic fields on small scales, however, the origin of the large-scale component is unclear. In this write-up we describe our progress in an on-going work and discuss the possibility of dipole-type magnetic fields being brought onto SMBH by magnetised neutron stars, which are expected to drift inward from a hidden population in the Nuclear Star Cluster. This can contribute to an organised component of the magnetic field on the characteristic length-scale of the stellar size, which thread the horizon during the final stages of the magnetized star plunge into or its close flyby around SMBH. Because of mass size scaling relations for black holes, the effect is more important for lower-mass SMBH.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Karas, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kopacek, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kunneriath, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zajacek, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Araudo, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Eckart, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kovar, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-245535
Journal or Publication Title:	Contrib. Astron. Obs. S.
Volume:	47
Number:	2
Page Range:	S. 124 - 133
Date:	2017
Publisher:	SLOVAK ACADEMY SCIENCES ASTRONOMICAL INST
Place of Publication:	TATRANSKA LOMINICA
ISSN:	1336-0337
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MASSIVE BLACK-HOLE; GRAVITATIONAL-FIELD; ACCRETION DISKS; DISCOVERY; PULSAR; MILKY Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/24553