Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7136
Title: Optical variability of narrow-line and broad-line Seyfert 1 galaxies
Authors: Rakshit, S
Stalin, C. S
Keywords: Galaxies: active;Galaxies: Seyfert;Techniques: photometric
Issue Date: 20-May-2017
Publisher: IOP Publishing
Citation: The Astrophysical Journal, Vol. 842, No. 2, 96
Abstract: We studied the optical variability (OV) of a large sample of narrow-line Seyfert 1 (NLSy1) and broad-line Seyfert 1 (BLSy1) galaxies with z < 0.8 to investigate any differences in their OV properties. Using archival optical V-band light curves from the Catalina Real Time Transient Survey that span 5–9 years and modeling them using damped random walk, we estimated the amplitude of variability. We found that NLSy1 galaxies as a class show lower amplitude of variability than their broad-line counterparts. In the sample of both NLSy1 and BLSy1 galaxies, radio-loud sources are found to have higher variability amplitude than radio-quiet sources. Considering only sources that are detected in the X-ray band, NLSy1 galaxies are less optically variable than BLSy1 galaxies. The amplitude of variability in the sample of both NLSy1 and BLSy1 galaxies is found to be anti-correlated with Fe ii strength but correlated with the width of the Hβ line. The well-known anti-correlation of variability–luminosity and the variability–Eddington ratio is present in our data. Among the radio-loud sample, variability amplitude is found to be correlated with radio-loudness and radio-power, suggesting that jets also play an important role in the OV in radio-loud objects, in addition to the Eddington ratio, which is the main driving factor of OV in radio-quiet sources.
Description: Restricted Access
URI: http://hdl.handle.net/2248/7136
ISSN: 0004-637X
???metadata.dc.rights???: © The American Astronomical Society
???metadata.dc.relation.uri???: https://doi.org/10.3847/1538-4357/aa72f4
Appears in Collections:IIAP Publications

Files in This Item:
File Description SizeFormat 
Optical Variability of Narrow-line.pdfRestricted Access1.57 MBAdobe PDFView/Open    Request a copy


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