Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies in the Sloan Digital Sky Survey

Vaidehi S. Paliya, M. Ajello, S. Rakshit, Amit Kumar Mandal, C. S. Stalin, Amanpreet Kaur, D. Hartmann

Research output: Contribution to journalArticle

26 Citations (Scopus)

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 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.

Original languageEnglish (US)
Article numberL2
JournalAstrophysical Journal Letters
Volume853
Issue number1
DOIs
StatePublished - Jan 20 2018

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radio spectra
quasars
rays
gamma rays
radio
galaxies
blazars
active galactic nuclei
Wide-field Infrared Survey Explorer
color-color diagram
catalogs
optical spectrum
erg
luminosity
telescopes
diagram

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Paliya, V. S., Ajello, M., Rakshit, S., Mandal, A. K., Stalin, C. S., Kaur, A., & Hartmann, D. (2018). Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies in the Sloan Digital Sky Survey. Astrophysical Journal Letters, 853(1), [L2]. https://doi.org/10.3847/2041-8213/aaa5ab
Paliya, Vaidehi S. ; Ajello, M. ; Rakshit, S. ; Mandal, Amit Kumar ; Stalin, C. S. ; Kaur, Amanpreet ; Hartmann, D. / Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies in the Sloan Digital Sky Survey. In: Astrophysical Journal Letters. 2018 ; Vol. 853, No. 1.
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Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies in the Sloan Digital Sky Survey. / Paliya, Vaidehi S.; Ajello, M.; Rakshit, S.; Mandal, Amit Kumar; Stalin, C. S.; Kaur, Amanpreet; Hartmann, D.

In: Astrophysical Journal Letters, Vol. 853, No. 1, L2, 20.01.2018.

Research output: Contribution to journalArticle

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AU - Ajello, M.

AU - Rakshit, S.

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