Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/6728
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dc.contributor.authorRakshit, S-
dc.contributor.authorJohnson, A-
dc.contributor.authorStalin, C. S-
dc.contributor.authorGandhi, Poshak-
dc.contributor.authorHoenig, Sebastian-
dc.date.accessioned2020-11-10T02:29:26Z-
dc.date.available2020-11-10T02:29:26Z-
dc.date.issued2019-02-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, Vol. 483, No. 2, pp.2362–2370en_US
dc.identifier.issn1365-2966-
dc.identifier.urihttp://prints.iiap.res.in/handle/2248/6728-
dc.descriptionRestricted Access © Royal Astronomical Society https://doi.org/10.1093/mnras/sty3261en_US
dc.description.abstractWe present the colour and flux variability analysis at 3.4 μm (W1 band) and 4.6 μm (W2 band) of 492 narrow-line Seyfert 1 (NLSy1) galaxies using archival data from the Wide-field Infrared Survey Explorer (WISE). In the WISE colour–colour, (W1 − W2) versus (W2 − W3) diagram, ∼58 per cent of the NLSy1 galaxies of our sample lie in the region occupied by the blazar category of active galactic nuclei (AGNs). The mean W1 − W2 colour of candidate variable NLSy1 galaxies is 0.99 ± 0.18 mag. The average amplitude of variability is 0.11 ± 0.07 mag in long term (multiyear) with no difference in variability between W1 and W2 bands. The W1 − W2 colour of NLSy1 galaxies is anticorrelated with the relative strength of [O iii] to Hβ, strongly correlated with continuum luminosity, black hole mass, and Eddington ratio. The long-term amplitude of variability shows weak anticorrelation with the Fe ii strength, continuum luminosity and Eddington ratio. A positive correlation between colour as well as the amplitude of variability with the radio power at 1.4 GHz was found for the radio-detected NLSy1 galaxies. This suggests non-thermal synchrotron contribution to the mid-infrared colour and flux variability in radio-detected NLSy1 galaxies.en_US
dc.publisherOxford University Press on behalf of the Royal Astronomical Societyen_US
dc.subjectTechniques: photometricen_US
dc.subjectGalaxies: activeen_US
dc.subjectGalaxies: Seyferten_US
dc.titleWISE view of narrow-line Seyfert 1 galaxies: mid-infrared colour and variabilityen_US
dc.typeArticleen_US
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