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:
CreatorsEmailORCIDORCID Put Code
Tursunov, ArmanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zajacek, MichalUNSPECIFIEDorcid.org/0000-0001-6450-1187UNSPECIFIED
Eckart, AndreasUNSPECIFIEDorcid.org/0000-0001-6049-3132UNSPECIFIED
Kolos, MartinUNSPECIFIEDorcid.org/0000-0002-4900-5537UNSPECIFIED
Britzen, SilkeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stuchlik, ZdenekUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Czerny, BozenaUNSPECIFIEDorcid.org/0000-0001-5848-4333UNSPECIFIED
Karas, VladimirUNSPECIFIEDorcid.org/0000-0002-5760-0459UNSPECIFIED
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:
KeywordsLanguage
SAGITTARIUS-A-ASTERISK; SUPERMASSIVE BLACK-HOLE; NEAR-INFRARED FLARES; MAGNETIC-FIELD; ACCRETION FLOW; COLLAPSING STAR; STELLAR WINDS; EVENT-HORIZON; MODEL; EMISSIONMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/32789

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