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WISE view of narrow-line Seyfert 1 galaxies: mid-infrared colour and variability

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dc.contributor.author Rakshit, S
dc.contributor.author Johnson, A
dc.contributor.author Stalin, C.S
dc.contributor.author Gandhi, Poshak
dc.contributor.author Hoenig, Sebastian
dc.date.accessioned 2020-11-10T02:29:26Z
dc.date.available 2020-11-10T02:29:26Z
dc.date.issued 2019-02
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 483, No. 2, pp.2362–2370 en_US
dc.identifier.issn 1365-2966
dc.identifier.uri http://prints.iiap.res.in/handle/2248/6728
dc.description Restricted Access © Royal Astronomical Society https://doi.org/10.1093/mnras/sty3261 en_US
dc.description.abstract We 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.publisher Oxford University Press on behalf of the Royal Astronomical Society en_US
dc.subject Techniques: photometric en_US
dc.subject Galaxies: active en_US
dc.subject Galaxies: Seyfert en_US
dc.title WISE view of narrow-line Seyfert 1 galaxies: mid-infrared colour and variability en_US
dc.type Article en_US


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