Universität zu Köln

Tursunov, Arman, Zajacek, Michal ORCID: 0000-0001-6450-1187, Eckart, Andreas ORCID: 0000-0001-6049-3132, Kolos, Martin ORCID: 0000-0002-4900-5537, Britzen, Silke, Stuchlik, Zdenek, Czerny, Bozena ORCID: 0000-0001-5848-4333 and Karas, Vladimir ORCID: 0000-0002-5760-0459 (2020). Effect of Electromagnetic Interaction on Galactic Center Flare Components. Astrophys. J., 897 (1). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

Recently, near-infrared GRAVITY@ESO observations at 2.2 mu m announced the detection of three bright flares in the vicinity of the Galactic center supermassive black hole (SMBH) that exhibited orbital motion at a distance of about 6-11 gravitational radii from an similar to 4 x 10(6)Mblack hole. There are indications of the presence of a large-scale, organized component of the magnetic field at the Galactic center. Electromagnetic effects on the flare dynamics were previously not taken into account despite the relativistic motion of a plasma in magnetic field leading to the charge separation and nonnegligible net charge density in the plasma. Applying various approaches, we find the net charge number density of the flare components of the order of 10(-3)-10(-4)cm(-3), while the particles' total number density is of the order of 10(6)-10(8)cm(-3). However, even such a tiny excess of charged particles in the quasi-neutral plasma can significantly affect the dynamics of flare components, which can then lead to the degeneracy in the measurements of spin of the SMBH. Analyzing the dynamics of recent flares in the case of the rapidly rotating black hole, we also constrain the inclination angle between the magnetic field and spin axis to alpha < 50 degrees, as for larger angles, the motion of the hot spot is strongly chaotic.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Tursunov, Arman UNSPECIFIED UNSPECIFIED UNSPECIFIED Zajacek, Michal UNSPECIFIED orcid.org/0000-0001-6450-1187 UNSPECIFIED Eckart, Andreas UNSPECIFIED orcid.org/0000-0001-6049-3132 UNSPECIFIED Kolos, Martin UNSPECIFIED orcid.org/0000-0002-4900-5537 UNSPECIFIED Britzen, Silke UNSPECIFIED UNSPECIFIED UNSPECIFIED Stuchlik, Zdenek UNSPECIFIED UNSPECIFIED UNSPECIFIED Czerny, Bozena UNSPECIFIED orcid.org/0000-0001-5848-4333 UNSPECIFIED Karas, Vladimir UNSPECIFIED orcid.org/0000-0002-5760-0459 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-327891
DOI:	10.3847/1538-4357/ab980e
Journal or Publication Title:	Astrophys. J.
Volume:	897
Number:	1
Date:	2020
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SAGITTARIUS-A-ASTERISK; SUPERMASSIVE BLACK-HOLE; NEAR-INFRARED FLARES; MAGNETIC-FIELD; ACCRETION FLOW; COLLAPSING STAR; STELLAR WINDS; EVENT-HORIZON; MODEL; EMISSION Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/32789