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Polarization of emission from black hole accretion disks: including returning radiation
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SYSNO ASEP 0567704 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Polarization of emission from black hole accretion disks: including returning radiation Author(s) Taverna, R. (IT)
Bursa, Michal (ASU-R) RID, ORCID
Dovčiak, Michal (ASU-R) RID, ORCID
Karas, Vladimír (ASU-R) RID, ORCID
Marin, F. (FR)
Matt, G. (IT)
Mikušincová, R. (IT)
Zhang, W. (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. 250-257 Number of pages 8 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 polarization ; relativity ; polarimeters Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) Institutional support ASU-R - RVO:67985815 DOI 10.1142/9789811258251_0021 Annotation Accretion disks around stellar-mass black holes (BHs) are observed to emit radiation peaking in the soft X-rays (at about 1 keV) when the source is in the thermal state. This emission is expected to be polarized, because of electron scattering in the disk. However, photons will experience a rotation of the polarization plane due to General Relativity effects. X-ray polarization measurements can then be crucial in assessing strong gravity effects around accreting stellar-mass BHs, providing independent constraints on their spin. In this work, we present the simulated polarization spectra (obtained according to the model by Dovčiak et al.) for the X-ray, thermal radiation emitted by the accretion disk, as expected to be measured by IXPE, an X-ray polarimeter which will be launched in 2021. We also illustrate the code, currently under development, incorporate the contribution of returning radiation and account for absorption effects by the disk material. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2023
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