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Role of emission angular directionality in spin determination of accreting black holes with a broad iron line

SYSNO ASEP	0332636
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Role of emission angular directionality in spin determination of accreting black holes with a broad iron line
Author(s)	Svoboda, Jiří (ASU-R)_{RID, ORCID} Dovčiak, Michal (ASU-R)_{RID, ORCID} Goosmann, René (ASU-R) Karas, Vladimír (ASU-R)_{RID, ORCID}
Source Title	Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361 Roč. 507, č. 1 (2009), s. 1-17
Number of pages	17 s.
Language	eng - English
Country	FR - France
Keywords	accretion disc ; black hole physics ; active galaxies
Subject RIV	BN - Astronomy, Celestial Mechanics, Astrophysics
R&D Projects	GA205/07/0052 GA ČR - Czech Science Foundation (CSF)
	GD205/09/H033 GA ČR - Czech Science Foundation (CSF)
	LC06014 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
	IAA300030510 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
	ME09036 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
CEZ	AV0Z10030501 - ASU-R (2005-2011)
UT WOS	000271782900006
DOI	10.1051/0004-6361/200911941
Annotation	We discuss the method to determine the spin of black holes by employing the broad relativistic iron line profiles in the X-ray domain. The precision of the spectral fitting procedure could be compromised by an inappropriate account for the angular distribution of the disc emission. Often a unique profile is assumed, invariable over the entire range of radii in the disc and energy in the spectral band. We study how sensitive the spin determination is to the assumptions about the intrinsic angular distribution of the emitted photons. Based on the radiation transfer computations, we produced a new extension to the KY software package for X-ray spectra fitting of relativistic accretion disc models. We found that, from the commonly used simple profiles, the isotropic distribution of the angular emissivity reproduces our model data to the best precision.
Workplace	Astronomical Institute
Contact	Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326
Year of Publishing	2010

Number of the records: 1