Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7240
Title: Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies in the Sloan Digital Sky Survey
Authors: Paliya, Vaidehi S
Ajello, M
Rakshit, S
Amit Kumar
Stalin, C. S
Kaur, A
Hartmann, D
Keywords: Galaxies: active;Galaxies: jets;Galaxies: Seyfert;Gamma rays: galaxies;Quasars: general
Issue Date: 20-Jan-2018
Publisher: IOP Publishing
Citation: The Astrophysical Journal Letters. Vol. 853, No. 1, L2
Abstract: The detection of significant γ-ray emission from radio-loud narrow-line Seyfert 1 (NLSy1s) galaxies enables us to study jets in environments different than those in blazars. However, due to the small number of known γ-ray-emitting NLSy1 (γ-NLSy1) galaxies, a comprehensive study could not be performed. Here, we report the first detection of significant γ-ray emission from four active galactic nuclei (AGNs), recently classified as NLSy1 from their Sloan Digital Sky Survey (SDSS) optical spectrum. Three flat-spectrum radio quasars (FSRQs) present in the third Large Area Telescope AGN catalog (3LAC) are also found as γ-NLSy1 galaxies. Comparing the γ-ray properties of these objects with 3LAC blazars reveals their spectral shapes to be similar to FSRQs, however, with low γ-ray luminosity (≲1046–47 erg s‑1). In the Wide-field Infrared Survey Explorer color–color diagram, these objects occupy a region mainly populated by FSRQs. Using the H β emission line parameters, we find that on average γ-NLSy1 have smaller black hole masses than FSRQs at similar redshifts. In the low-resolution SDSS image of one of the γ-NLSy1 source, we find the evidence of an extended structure. We conclude by noting that overall many observational properties of γ-NLSy1 sources are similar to FSRQs, and therefore these objects could be their low black hole mass counterparts, as predicted in the literature.
Description: Restricted Access
URI: http://hdl.handle.net/2248/7240
ISSN: 2041-8205
???metadata.dc.rights???: © The American Astronomical Society
???metadata.dc.relation.uri???: https://doi.org/10.3847/2041-8213/aaa5ab
Appears in Collections:IIAP Publications

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