Počet záznamů: 1
X-ray polarimetry as a tool to measure the black hole spin in microquasars: simulations of IXPE capabilities
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SYSNO ASEP 0570198 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název X-ray polarimetry as a tool to measure the black hole spin in microquasars: simulations of IXPE capabilities Tvůrce(i) Mikušincová, R. (IT)
Dovčiak, Michal (ASU-R) RID, ORCID
Bursa, Michal (ASU-R) RID, ORCID
Lalla, N. D. (US)
Matt, G. (IT)
Svoboda, Jiří (ASU-R) RID, ORCID
Taverna, R. (IT)
Zhang, W. (CN)Celkový počet autorů 8 Zdroj.dok. Monthly Notices of the Royal Astronomical Society. - : Oxford University Press - ISSN 0035-8711
Roč. 519, č. 4 (2023), s. 6138-6148Poč.str. 11 s. Forma vydání Online - E Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova accretion discs ; polarization ; relativistic processes Vědní obor RIV BN - Astronomie a nebeská mechanika, astrofyzika Obor OECD Astronomy (including astrophysics,space science) CEP GX21-06825X GA ČR - Grantová agentura ČR Způsob publikování Omezený přístup Institucionální podpora ASU-R - RVO:67985815 UT WOS 000931186300005 EID SCOPUS 85150949031 DOI 10.1093/mnras/stad077 Anotace We present simulated observations of an X-ray binary system with the Imaging X-ray Polarimetry Explorer (IXPE), with the aim to study the robustness of black hole spin and geometry measurements using X-ray polarimetry. As a representative example, we used the parameters of GRS 1915 + 105 in its former unobscured, soft state. In order to simulate the polarization properties, we modelled the source emission with a multicolour blackbody accounting for thermal radiation from the accretion disc, including returning radiation. Our analysis shows that the polarimetric observations in the X-ray waveband will be able to estimate both spin and inclination of the system with a good precision [without returning radiation we obtained for the lowest spin Delta a < 0.4 (0.4/0.998 similar to 40 per cent) for spin and Delta i < 30 degrees (30 degrees/70 degrees similar to 43 per cent) for inclination, while for the higher spin values we obtained Delta a < 0.12 ( similar to 12 per cent) for spin and Delta i < 20 degrees (similar to 29 per cent) for inclination, within 1 a errors]. When focusing on the case of returning radiation and treating inclination as a known parameter, we were able to successfully reconstruct spin and disc albedo in Delta a < 0.15 (similar to 15 per cent) interval and Delta albedo < 0.45 (45 per cent) intervals within 1 a errors. We conclude that X-ray polarimetry will be a useful tool to constrain black hole spins, in addition to timing and spectral-fitting methods. Pracoviště Astronomický ústav Kontakt Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Rok sběru 2024 Elektronická adresa https://doi.org/10.1093/mnras/stad077
Počet záznamů: 1