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The flare model for X-ray variability of NGC 4258
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SYSNO ASEP 0359783 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The flare model for X-ray variability of NGC 4258 Author(s) Trzesniewski, T. (PL)
Czerny, B. (PL)
Karas, Vladimír (ASU-R) RID, ORCID
Pecháček, Tomáš (ASU-R)
Dovčiak, Michal (ASU-R) RID, ORCID
Goosmann, R. W. (FR)
Nikolajuk, M. (PL)Number of authors 7 Source Title Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361
Roč. 530, June (2011), A136/1-A136/6Number of pages 6 s. Language eng - English Country FR - France Keywords accretion disks ; active galaxies ; X-rays Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics R&D Projects GA205/07/0052 GA ČR - Czech Science Foundation (CSF) ME09036 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA202/09/0772 GA ČR - Czech Science Foundation (CSF) GP205/09/P468 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10030501 - ASU-R (2005-2011) UT WOS 000291027400136 DOI 10.1051/0004-6361/201016369 Annotation We study the variability mechanism of active galactic nuclei (AGN) within the framework of the flare model. To this end we examine the case of Seyfert/LINER galaxy NGC 4258, which is observed at high inclination angle and exhibits rapid fluctuations of the X-ray light curve. We construct a model light curve based on the assumption of magnetic flares localized in the equatorial plane. We calculate the level of variability as a function of the inclination. Highly inclined sources such as this one are particularly suitable to test the flare model because the effects of orbital motion, Doppler boosting and light bending are all expected to have maximum when the accretion disk is seen almost edge-on. The model is consistent with the NGC 4258 variability, where the obscuring material is thought to be localized mainly towards the equatorial plane. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2012
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