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Long-term optical and X-ray variability of the Seyfert galaxy Markarian 79

dc.contributor.authorBreedt, E.en_US
dc.contributor.authorArévalo, P.en_US
dc.contributor.authorMcHardy, Ian M.en_US
dc.contributor.authorUttley, P.en_US
dc.contributor.authorSergeev, S. G.en_US
dc.contributor.authorMinezaki, T.en_US
dc.contributor.authorYoshii, Y.en_US
dc.contributor.authorGaskell, C. M.en_US
dc.contributor.authorCackett, E. M.en_US
dc.contributor.authorHorne, K.en_US
dc.contributor.authorKoshida, S.en_US
dc.date.accessioned2010-06-01T19:36:41Z
dc.date.available2010-06-01T19:36:41Z
dc.date.issued2009-03-21en_US
dc.identifier.citationBreedt, E.; ArÉvalo, P.; McHardy, I. M.; Uttley, P.; Sergeev, S. G.; Minezaki, T.; Yoshii, Y.; Gaskell, C. M.; Cackett, E. M.; Horne, K.; Koshida, S. (2009). "Long-term optical and X-ray variability of the Seyfert galaxy Markarian 79." Monthly Notices of the Royal Astronomical Society 394(1): 427-437. <http://hdl.handle.net/2027.42/72747>en_US
dc.identifier.issn0035-8711en_US
dc.identifier.issn1365-2966en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/72747
dc.description.abstractWe present the results of concurrent X-ray and optical monitoring of the Seyfert 1 galaxy Mrk 79 over a period of more than 5 yr. We find that on short to medium time-scales (days to a few tens of days) the 2–10 keV X-ray and optical u - and V -band fluxes are significantly correlated, with a delay between the bands consistent with 0 d. We show that most of these variations may be well reproduced by a model where the short-term optical variations originate from reprocessing of X-rays by an optically thick accretion disc. The optical light curves, however, also display long time-scale variations over thousands of days, which are not present in the X-ray light curve. These optical variations must originate from an independent variability mechanism and we show that they can be produced by variations in the (geometrically) thin disc accretion rate as well as by varying reprocessed fractions through changes in the location of the X-ray corona.en_US
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dc.publisherBlackwell Publishing Ltden_US
dc.rightsJournal compilation © 2009 RASen_US
dc.subject.otherGalaxies: Activeen_US
dc.subject.otherGalaxies: Individual: Mrk 79en_US
dc.subject.otherGalaxies: Seyferten_US
dc.titleLong-term optical and X-ray variability of the Seyfert galaxy Markarian 79en_US
dc.typeArticleen_US
dc.subject.hlbsecondlevelAstronomyen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumChandra Fellow, Department of Astronomy, University of Michigan, 500 Church Street, Ann Arbor, MI 48109, USAen_US
dc.contributor.affiliationotherSchool of Physics and Astronomy, University of Southampton, Southampton SO17 1BJen_US
dc.contributor.affiliationotherCrimean Astrophysical Observatory, P/O Nauchny, Crimea 98409, Ukraineen_US
dc.contributor.affiliationotherIsaac Newton Institute of Chile, Crimean Branch, Crimea 98409, Ukraineen_US
dc.contributor.affiliationotherInstitute of Astronomy, School of Science, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japanen_US
dc.contributor.affiliationotherResearch Centre for the Early Universe, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japanen_US
dc.contributor.affiliationotherDepartment of Astronomy, University of Texas, Austin, TX 78712-0259, USAen_US
dc.contributor.affiliationotherSchool of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SSen_US
dc.contributor.affiliationotherDepartment of Astronomy, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japanen_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/72747/1/j.1365-2966.2008.14302.x.pdf
dc.identifier.doi10.1111/j.1365-2966.2008.14302.xen_US
dc.identifier.sourceMonthly Notices of the Royal Astronomical Societyen_US
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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