Astrophys. J., 853, L2-L2 (2018/January-3)
Gamma-ray-emitting narrow-line Seyfert 1 galaxies in the Sloan Digital Sky Survey.
PALIYA V.S., AJELLO M., RAKSHIT S., MANDAL A.K., STALIN C.S., KAUR A. and HARTMANN D.
Abstract (from CDS):
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 Hβ 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.
© 2018. The American Astronomical Society. All rights reserved.
galaxies: active - galaxies: jets - galaxies: Seyfert - gamma rays: galaxies - quasars: general - quasars: general
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