Počet záznamů: 1
The flare model for X-ray variability of NGC 4258
0359783 - ASU-R 2012 RIV FR eng J - Článek v odborném periodiku
Trzesniewski, T. - Czerny, B. - Karas, Vladimír - Pecháček, Tomáš - Dovčiak, Michal - Goosmann, R. W. - Nikolajuk, M.
The flare model for X-ray variability of NGC 4258.
Astronomy & Astrophysics. Roč. 530, June (2011), A136/1-A136/6 ISSN 0004-6361
Grant CEP: GA ČR GA205/07/0052; GA MŠk ME09036; GA ČR GA202/09/0772; GA ČR GP205/09/P468
Výzkumný záměr: CEZ:AV0Z10030501
Klíčová slova: accretion disks * active galaxies * X-rays
Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
Impakt faktor: 4.587, rok: 2011
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.
Trvalý link: http://hdl.handle.net/11104/0197496