The first gamma-ray outburst of a narrow-line Seyfert 1 galaxy: The case of PMN J0948+0022 in 2010 July

Journal Article · Wed May 11 00:00:00 EDT 2011 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1111/j.1365-2966.2011.18240.x· OSTI ID:1357259

Foschini, Luigi ^[1]; Ghisellini, G. ^[1]; Kovalev, Y. Y. ^[2]; Lister, M. L. ^[3]; D’Ammando, F. ^[4]; Thompson, D. J. ^[5]; Tramacere, A. ^[6]; Angelakis, E. ^[7]; Donato, D. ^[8]; Falcone, A. ^[9]; Fuhrmann, L. ^[7]; Hauser, M. ^[10]; Kovalev, Yu. A. ^[11]; Mannheim, K. ^[12]; Maraschi, L. ^[1]; Max-Moerbeck, W. ^[13]; Nestoras, I. ^[7]; Pavlidou, V. ^[13]; Pearson, T. J. ^[13]; Pushkarev, A. B. ^[14] ; Readhead, A. C. S. ^[13]; Richards, J. L. ^[13]; Stevenson, M. A. ^[13]; Tagliaferri, G. ^[1]; Tibolla, O. ^[12]; Tavecchio, F. ^[1]; Wagner, S. ^[10]

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1. INAF - Osservatorio Astronomico di Brera, Merate (LC) (Italy)
2. Astro Space Center of the Lebedev Physical Institute, Moscow (Russia); Max-Planck-Institut fur Radioastronomie, Bonn (Germany)
3. Purdue Univ., West Lafayette, IN (United States)
4. INAF - IASF-Palermo, Palermo (Italy)
5. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
6. ISDC Data Centre for Astrophysics, Versoix (Switzerland)
7. Max-Planck-Institut fur Radioastronomie, Bonn (Germany)
8. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States)
9. Pennsylvania State Univ., University Park, PA (United States)
10. Univ. Heidelberg, Heidelberg (Germany)
11. Astro Space Center of the Lebedev Physical Institute, Moscow (Russia)
12. Univ. of Wurzburg, Wurzburg (Germany)
13. California Inst. of Technology (CalTech), Pasadena, CA (United States)
14. Max-Planck-Institut fur Radioastronomie, Bonn (Germany); Crimean Astrophysical Observatory, Crimea (Ukraine); Pulkovo Observatory, St. Petersburg (Russia)

We report on a multiwavelength campaign for the radio-loud narrow-line Seyfert 1 (NLS1) galaxy PMN J0948+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–2 s–1, corresponding to an observed luminosity of ~1048 erg s–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. Furthermore, the comparison of the spectral energy distribution of the NLS1 PMN J0948+0022 with that of a typical blazar – such as 3C 273 – shows that the power emitted at γ-rays is extreme.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC02-76SF00515
• OSTI ID: 1357259
• Journal Information: Monthly Notices of the Royal Astronomical Society, Vol. 413, Issue 3; ISSN 0035-8711
• Publisher: Royal Astronomical Society
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
galaxies: individual: PMN J0948+0022
galaxies: jets
galaxies: Seyfert