About: The flare model for X-ray variability of NGC 4258

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An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	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. 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. (en)
Title	The flare model for X-ray variability of NGC 4258 The flare model for X-ray variability of NGC 4258 (en)
skos:prefLabel	The flare model for X-ray variability of NGC 4258 The flare model for X-ray variability of NGC 4258 (en)
skos:notation	RIV/67985815:_____/11:00359783!RIV12-AV0-67985815
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(GA202/09/0772), P(GA205/07/0052), P(GP205/09/P468), P(ME09036), Z(AV0Z10030501)
http://linked.open...iv/cisloPeriodika	June
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Dovčiak, Michal Karas, Vladimír Pecháček, Tomáš
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Astronomický ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	199911
http://linked.open...ai/riv/idVysledku	RIV/67985815:_____/11:00359783
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	accretion disks; active galaxies; X-rays (en)
http://linked.open.../riv/klicoveSlovo	active galaxies accretion disks X-rays
http://linked.open...odStatuVydavatele	FR - Francouzská republika
http://linked.open...ontrolniKodProRIV	[29985776B296]
http://linked.open...i/riv/nazevZdroje	Astronomy and Astrophysics
http://linked.open...in/vavai/riv/obor	BN
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	7 (xsd:int)
http://linked.open...vavai/riv/projekt	Mathematical models for stochastic variability of accretion discs Current problems of gravitation, general relativity and relativistic astrophysics Signatures of strong gravity in black hole accretion discs and in outflows Revealing black holes: spectral, polarimetric and timing studies using satellite data
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	530
http://linked.open...iv/tvurceVysledku	Dovčiak, Michal Karas, Vladimír Czerny, B. Goosmann, R. W. Nikolajuk, M. Pecháček, Tomáš Trzesniewski, T.
http://linked.open...ain/vavai/riv/wos	000291027400136
http://linked.open...n/vavai/riv/zamer	Astronomie a astrofyzika
issn	0004-6361
number of pages	6 (xsd:int)
http://bibframe.org/vocab/doi	10.1051/0004-6361/201016369

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