The Seyfert Galaxy NGC 6814 -- a highly variable X-ray source

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dc.creatorKoenig, Michael
dc.creatorFriedrich, Susanne
dc.creatorStaubert, Ruediger
dc.creatorTimmer, Jens
dc.date1996-12-18
dc.date.accessioned2026-07-07T02:22:36Z
dc.date.available2026-07-07T02:22:36Z
dc.descriptionThe Seyfert galaxy NGC 6814 is a highly variable X-ray source despite the fact that it has recently been shown not to be the source of periodic variability. The 1.5 year monitoring by ROSAT has revealed a long term downward trend of the X-ray flux and an episode of high and rapidly varying flux (e.g. by a factor of about 3 in 8 hours) during the October 1992 PSPC observation. Temporal analysis of this data using both Fourier and autoregressive techniques have shown that the variability timescales are larger than a few hundred seconds. The behavior at higher frequencies can be described by white noise.
dc.description5 pages, Latex, 6 PostScript figures, to be published in Astron. and Astrophys
dc.identifierhttps://arxiv.org/abs/astro-ph/9612176
dc.identifierhttp://arxiv.org/abs/astro-ph/9612176
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/10932
dc.subjectAstrophysics
dc.titleThe Seyfert Galaxy NGC 6814 -- a highly variable X-ray source
dc.typetext

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