Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7386
Full metadata record
DC FieldValueLanguage
dc.contributor.authorSukanya, N-
dc.contributor.authorStalin, C. S-
dc.contributor.authorJoseph, P-
dc.contributor.authorRakshit, S-
dc.contributor.authorPraveen, D-
dc.contributor.authorDamle, R-
dc.date.accessioned2019-02-11T09:35:27Z-
dc.date.available2019-02-11T09:35:27Z-
dc.date.issued2018-12-
dc.identifier.citationJournal of Astrophysics and Astronomy, Vol. 39, No. 6, 65en_US
dc.identifier.issn0250-6335-
dc.identifier.urihttp://hdl.handle.net/2248/7386-
dc.descriptionOpen Accessen_US
dc.description.abstractFlux variability is one of the defining characteristics of Seyfert galaxies, a class of active galactic nuclei (AGN). Although these variations are observed over a wide range of wavelengths, results on their flux variability characteristics in the ultraviolet (UV) band are very limited. We present here the long-term UV flux variability characteristics of a sample of fourteen Seyfert galaxies using data from the International Ultraviolet Explorer acquired between 1978 and 1995. We found that all the sources showed flux variations with no statistically significant differences in the amplitude of UV flux variation between shorter and longer wavelengths. Also, the flux variations between different near-UV (NUV, 1850−3300 Å) and far-UV (FUV, 1150−2000 Å) passbands in the rest frames of the objects are correlated with no time lag. The data show indications of (i) a mild negative correlation of UV variability with bolometric luminosity and (ii) weak positive correlation between UV variability and black hole mass. At FUV, about 50% of the sources show a strong correlation between spectral indices and flux variations with a hardening when brightening behaviour, while for the remaining sources the correlation is moderate. In NUV, the sources do show a harder spectrum when brighter, but the correlation is either weak or moderate.en_US
dc.language.isoenen_US
dc.publisherIndian Academy of Sciencesen_US
dc.relation.urihttps://doi.org/10.1007/s12036-018-9556-z-
dc.rights© Indian Academy of Sciences-
dc.subjectActive galaxiesen_US
dc.subjectSeyfertsen_US
dc.subjectVariabilityen_US
dc.titleLong-term ultraviolet variability of Seyfert galaxiesen_US
dc.typeArticleen_US
Appears in Collections:IIAP Publications

Files in This Item:
File Description SizeFormat 
Long term ultraviolet variability of Seyfert galaxies.pdfOpen Access2.99 MBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.