Similarity of the variability patterns in the Exosat and Ginga folded light curves of the Seyfert galaxy NGC 6814

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dc.creatorAbramowicz, M. A.
dc.creatorBao, G.
dc.creatorKaras, V.
dc.creatorLanza, A.
dc.date1993-01-08
dc.date.accessioned2026-07-07T02:18:43Z
dc.date.available2026-07-07T02:18:43Z
dc.descriptionThe Seyfert galaxy NGC 6814 is known to show periodic variation of its X-ray luminosity. We found that the sequences of peaks (variability patterns) in the folded X-ray light curves constructed from the {\it Exosat} and {\it Ginga} data are remarkably similar when one ignores amplitudes of the peaks and considers only their phases. The stable pattern consists of five peaks which are present in the both curves. The phases of the corresponding peaks coincide with an accuracy of about 10 degrees. The probability that this coincidence occurs by chance is less than about 1\% according to the most conservative estimate. The observed stable pattern of peaks may be produced by a stable distribution of ``bright spots'' on the accretion disk surface, {\it e.g.} by strong vortices or magnetic flux tubes.
dc.description9 pages (14 figures not included), TeX, SISSA 220/92/A
dc.identifierhttps://arxiv.org/abs/astro-ph/9301003
dc.identifierhttp://arxiv.org/abs/astro-ph/9301003
dc.identifierAstron.Astrophys. 272 (1993) 400-406
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/9599
dc.subjectAstrophysics
dc.titleSimilarity of the variability patterns in the Exosat and Ginga folded light curves of the Seyfert galaxy NGC 6814
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