GeV gamma-ray narrow-line Seyfert 1 galaxies and the Fermi LAT Flare Advocate service

Ciprini, S.

doi:10.22323/1.328.0020

Proceedings of Revisiting Narrow-Line Seyfert 1 Galaxies and Their Place in the Universe — PoS(NLS1-2018) 2018

DOI: 10.22323/1.328.0020

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GeV gamma-ray narrow-line Seyfert 1 galaxies and the Fermi LAT Flare Advocate service

S. Ciprini¹

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2019

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General Physical Properties of Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies

Paliya

Parker

Jiang

et al. 2019

ApJ

116

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We present the results of a detailed multi-wavelength study of a sample of sixteen narrow-line Seyfert 1 (NLSy1) galaxies known in γ-rays so far. This includes a focused X-ray spectral analysis, to compare them with a more general NLSy1 population, and a broadband spectral energy distribution (SED) modeling considering the leptonic radiative processes to understand their similarity/dissimilarity with blazars. The X-ray spectra of γ-NLSy1 galaxies exhibit similarities both with typical NLSy1 sources below 2 keV and blazars at higher energies. We also find weak evidences of excess absorption in the soft X-ray spectra of 3 sources and a tentative detection of Fe line in 1H 0323+342. A comparison of the broadband parameters derived from the SED modeling reveals the similarity of γ-NLSy1 objects with blazars, in particular more with flat spectrum radio quasars. The γ-NLS1 galaxies host relatively low power jets with small bulk Lorentz factors with respect to blazars and this explains the paucity of such sources in the γ-ray catalogs and identification of an even fewer parent population members. Many of the observed features of these intriguing objects suggest they host lowmass black holes. The accretion rate in Eddington units can be considered as the driving factor to explain the physical properties of γ-NLSy1 sources, similar to that which is known for general blazar population.

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General Physical Properties of Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies

Paliya

Parker

Jiang

et al. 2019

ApJ

116

View full text Add to dashboard Cite

show abstract

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GeV gamma-ray narrow-line Seyfert 1 galaxies and the Fermi LAT Flare Advocate service

Cited by 1 publication

References 32 publications

General Physical Properties of Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies

General Physical Properties of Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies

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