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Authordc.contributor.authorArévalo, P. 
Authordc.contributor.authorUttley, P. es_CL
Authordc.contributor.authorLira Teillery, Paulina es_CL
Authordc.contributor.authorBreedt, E. es_CL
Authordc.contributor.authorMcHardy, I. M. es_CL
Authordc.contributor.authorChurazov, E. 
Admission datedc.date.accessioned2013-03-26T13:56:13Z
Available datedc.date.available2013-03-26T13:56:13Z
Publication datedc.date.issued2009-08-21
Cita de ítemdc.identifier.citationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY Volume: 397 Issue: 4 Pages: 2004-2014 Published: AUG 21 2009en_US
Identifierdc.identifier.issn0035-8711
Identifierdc.identifier.otherDOI: 10.1111/j.1365-2966.2009.15110.x
Identifierdc.identifier.urihttps://repositorio.uchile.cl/handle/2250/125779
General notedc.descriptionArtículo de publicación ISIen_US
Abstractdc.description.abstractWe present simultaneous X-ray and optical B- and V-band light curves of the Seyfert Galaxy NGC 3783 spanning 2 years. The flux in all bands is highly variable and the fluctuations are significantly correlated. As shown before by Stirpe et al. the optical bands vary simultaneously, with a delay of less than 1.5 d but both B and V bands lag the X-ray fluctuations by 3–9 d. This delay points at optical variability produced by X-ray reprocessing and the value of the lag places the reprocessor close to the broad-line region. A power spectrum analysis of the light curve, however, shows that the X-ray variability has a power-law shape bending to a steeper slope at a time-scale of ∼2.9 d while the variability amplitude in the optical bands continues to grow towards the longest time-scale covered, ∼300 d. We show that the power spectra together with the small value of the time delay are inconsistent with a picture where all the optical variability is produced by X-ray reprocessing, though the small amplitude, rapid optical fluctuations might be produced in this way. We detect larger variability amplitudes on long time-scales in the optical bands than in the X-rays. This behaviour adds to similar results recently obtained for at least three other active galactic nuclei and indicates a separate source of long-term optical variability, possibly accretion rate or thermal fluctuations, in the optically emitting accretion disc.en_US
Patrocinadordc.description.sponsorshipFellowship for International Young Researchers Chinese Academy of Sciences Max-Planck-Institut fur Astrophysik, Garching STFC Advanced Fellowship FONDECYT 1080603 Stobie-SALT Scholarship STFC PP/D001013/1en_US
Lenguagedc.language.isoenen_US
Publisherdc.publisherWILEY-BLACKWELLen_US
Keywordsdc.subjectgalaxies: activeen_US
Títulodc.titleCorrelation and time delays of the X-ray and optical emission of the Seyfert Galaxy NGC 3783en_US
Document typedc.typeArtículo de revista


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