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Polarimetry and strong gravity effects from spots orbiting near a black hole
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SYSNO ASEP 0567696 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Polarimetry and strong gravity effects from spots orbiting near a black hole Author(s) Karas, Vladimír (ASU-R) RID, ORCID
Dovčiak, Michal (ASU-R) RID, ORCID
Svoboda, Jiří (ASU-R) RID, ORCID
Zhang, Wenda (ASU-R) ORCID
Matt, G. (IT)
Eckart, A. (DE)
Zajaček, M. (DE)Source Title The Fifteenth Marcel Grossmann Meeting: On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics, and Relativistic Field Theories. - Singapore : World Scientific, 2022 / Battistelli E. S. ; Jantzen R. T. ; Ruffini R. - ISBN 978-981-125-825-1 Pages s. 220-224 Number of pages 5 s. Publication form Online - E Action Marcel Grossmann Meeting on General Relativity /15./ Event date 01.07.2018 - 07.07.2018 VEvent location Rome Country IT - Italy Event type WRD Language eng - English Country SG - Singapore Keywords black holes ; gravitation ; galactic center Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) R&D Projects LTI17018 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support ASU-R - RVO:67985815 DOI 10.1142/9789811258251_0016 Annotation We study the modulation of the observed radiation flux and the associated changes in the polarization degree and angle that are predicted by the orbiting spot model for flares from accreting black holes. The geometric shape of the emission region influences the resulting model lightcurves, namely, the emission region of a spiral shape can be distinguished from a simpler geometry of a small orbiting spot. We further explore this scheme for the observed flares from the supermassive black hole in the context of Galactic center (Sgr A*). Our code simulates the lightcurves for a wide range of parameters. The energy dependence of the changing degree and angle of polarization should allow us to discriminate between the cases of a rotating and a non-rotating black hole. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2023
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