Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/6728
Title: WISE view of narrow-line Seyfert 1 galaxies: mid-infrared colour and variability
Authors: Rakshit, S
Johnson, A
Stalin, C. S
Gandhi, Poshak
Hoenig, Sebastian
Keywords: Techniques: photometric
Galaxies: active
Galaxies: Seyfert
Issue Date: Feb-2019
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, Vol. 483, No. 2, pp.2362–2370
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.
Description: Restricted Access © Royal Astronomical Society https://doi.org/10.1093/mnras/sty3261
URI: http://prints.iiap.res.in/handle/2248/6728
ISSN: 1365-2966
Appears in Collections:IIAP Publications

Files in This Item:
File Description SizeFormat 
WISE view of narrow-line Seyfert 1 galaxies.pdf
  Restricted Access
Restricted Access2.18 MBAdobe PDFView/Open Request a copy


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