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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 607555.0, MPI für Astronomie / Publikationen_mpia
g-ray variability of radio-loud narrow-line Seyfert 1 galaxies
Authors:Calderone, G.; Foschini, L.; Ghisellini, G.; Colpi, M.; Maraschi, L.; Tavecchio, F.; Decarli, R.; Tagliaferri, G.
Date of Publication (YYYY-MM-DD):2011
Journal Abbrev.:Monthly Notices of the Royal Astronomical Society
Issue / Number:4
Start Page:2365
End Page:2370
Audience:Not Specified
Abstract / Description:The recent detection of γ-ray emission from four radio-loud narrow-line Seyfert 1 galaxies suggests that the engine driving the active galactic nuclei (AGN) activity of these objects shares some similarities with that of blazars, namely the presence of a γ-ray emitting, variable jet of plasma closely aligned to the line of sight. In this work we analyse the γ-ray light curves of the four radio-loud narrow-line Seyfert 1 galaxies for which high-energy γ-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 γ-ray photons and confirms the presence of a relativistic jet. Furthermore, we estimate the minimum e-folding variability time-scale (3-30 d) and infer an upper limit for the size of the emitting region (0.2-2 pc, assuming a relativistic Doppler factor δ= 10 and a jet aperture of θ= 0.1 rad).
Free Keywords:galaxies: individual: PMN J0948+0022; galaxies: individual: 1H 0323+342; galaxies: individual: PKS 1502+036; galaxies: individual: PKS 2004-447; galaxies: jets; gamma-rays: galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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