Gamma-ray variability of radio-loud narrow-line Seyfert 1 galaxies

Abstract

The recent detection of gamma-ray emission from four radio-loud narrow-line Seyfert 1 galaxies suggests that the engine driving the AGN activity of these objects share some similarities with that of blazars, namely the presence of a gamma-ray emitting, variable, jet of plasma closely aligned to the line of sight. In this work we analyze the gamma-ray light curves of the four radio-loud narrow-line Seyfert 1 galaxies for which high-energy gamma-ray emission has been discovered by Fermi/LAT, in order to study their variability. We find significant flux variability in all the sources. This allows us to exclude a starburst origin of the gamma-ray photons and confirms the presence of a relativistic jet. Furthermore we estimate the minimum e-folding variability timescale (3 - 30 days) and infer an upper limit for the size of the emitting region (0.2 - 2 pc, assuming a relativistic Doppler factor delta=10 and a jet aperture of theta=0.1 rad).

7 pages, 2 figures. Accepted for publication on MNRAS

References in corpus (12)

• Fermi Large Area Telescope First Source Catalog
• Radio-loud Narrow-Line Type 1 Quasars
• A Population of Radio-loud Narrow Line Seyfert 1 Galaxies with Blazar-like Properties?
• The effect of radiation pressure on virial black hole mass estimates and the case of Narrow Line Seyfert 1 galaxies
• A radio-emitting outflow in the quiescent state of A0620-00: implications for modelling low-luminosity black hole binaries
• Constraining the location of the emitting region in Fermi blazars through rapid gamma-ray variability
• A narrow line Seyfert 1--blazar composite nucleus in 2MASX J0324+3410
• Are the black hole masses in Narrow Line Seyfert 1 galaxies actually small?
• The compact radio structure of radio-loud narrow line Seyfert 1 galaxies
• Blazar nuclei in radio-loud narrow-line Seyfert 1?
• The Spiral Host Galaxy of the Double Radio Source 0313-192
• Does the gamma-ray flux of the blazar 3C 454.3 vary on sub-hour timescales?

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