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 |