The first gamma-ray outburst of a narrow-line Seyfert 1 galaxy: the case of PMNJ0948+0022 in 2010 July

We report on a multiwavelength campaign for the radio-loud narrow-line Seyfert 1 (NLS1) galaxy PMNJ0948+0022 (z= 0.5846) performed in 2010 July-September and triggered by a high-energy γ-ray outburst observed by the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope. The peak flux in t...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2011-05, Vol.413 (3), p.1671-1677
Main Authors: Foschini, L, Ghisellini, G, Kovalev, Y. Y, Lister, M. L, D'Ammando, F, Thompson, D. J, Tramacere, A, Angelakis, E, Donato, D, Falcone, A, Fuhrmann, L, Hauser, M, Kovalev, Yu. A, Mannheim, K, Maraschi, L, Max-Moerbeck, W, Nestoras, I, Pavlidou, V, Pearson, T. J, Pushkarev, A. B, Readhead, A. C. S, Richards, J. L, Stevenson, M. A, Tagliaferri, G, Tibolla, O, Tavecchio, F, Wagner, S
Format: Article
Language:English
Subjects:
Gamma ray astronomy
Stars & galaxies
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Summary:We report on a multiwavelength campaign for the radio-loud narrow-line Seyfert 1 (NLS1) galaxy PMNJ0948+0022 (z= 0.5846) performed in 2010 July-September and triggered by a high-energy γ-ray outburst observed by the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope. The peak flux in the 0.1-100 GeV energy band exceeded, for the first time in this type of source, the value of 10-6 photon cm-2s-1, corresponding to an observed luminosity of 1048ergs-1. Although the source was too close to the Sun position to organize a densely sampled follow-up, it was possible to gather some multiwavelength data that confirmed the state of high activity across the sampled electromagnetic spectrum. The comparison of the spectral energy distribution of the NLS1 PMNJ0948+0022 with that of a typical blazar - such as 3C273 - shows that the power emitted at γ-rays is extreme. [PUBLICATION ABSTRACT]
ISSN:0035-8711
1365-2966
DOI:10.1111/j.1365-2966.2011.18240.x