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Multiwavelength obs...
Multiwavelength observations of the gamma-ray-emitting narrow-line Seyfert 1 PMN J0948+0022 in 2011
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D'Ammando, F. (author)
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- Larsson, Josefin (author)
- KTH,Partikel- och astropartikelfysik
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Orienti, M. (author)
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Raiteri, C. M. (author)
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Angelakis, E. (author)
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Carraminana, A. (author)
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Carrasco, L. (author)
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Drake, A. J. (author)
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Fuhrmann, L. (author)
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Giroletti, M. (author)
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Hovatta, T. (author)
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Max-Moerbeck, W. (author)
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Porras, A. (author)
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Readhead, A. C. S. (author)
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Recillas, E. (author)
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Richards, J. L. (author)
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(creator_code:org_t)
- 2014-01-28
- 2014
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 438:4, s. 3521-3534
- Related links:
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https://academic.oup...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- We report on radio-to-gamma-ray observations during 2011 May-September of PMN J0948+0022, the first narrow-line Seyfert 1 (NLSy1) galaxy detected in gamma-rays by Fermi-Large Area Telescope. Strong variability was observed in gamma-rays, with two flaring periods peaking on 2011 June 20 and July 28. The variability observed in optical and near-infrared seems to have no counterpart in gamma-rays. This different behaviour could be related to a bending and inhomogeneous jet or a turbulent extreme multicell scenario. The radio spectra showed a variability pattern typical of relativistic jets. The XMM spectrum shows that the emission from the jet dominates above similar to 2 keV, while a soft X-ray excess is evident in the low-energy part of the X-ray spectrum. Models where the soft emission is partly produced by blurred reflection or Comptonization of the thermal disc emission provide good fits to the data. The X-ray spectral slope is similar to that found in radio-quiet NLSy1, suggesting that a standard accretion disc is present, as expected from the high accretion rate. Except for the soft X-ray excess, unusual in jet-dominated active galactic nuclei, PMN J0948+0022, shows all characteristics of the blazar class.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- galaxies: active
- galaxies: individual: (PMN J0948+0022)
- galaxies: nuclei
- galaxies: Seyfert
- gamma-rays: galaxies
- gamma-rays: general
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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D'Ammando, F.
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Larsson, Josefin
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Orienti, M.
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Raiteri, C. M.
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Angelakis, E.
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Carraminana, A.
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show more...
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Carrasco, L.
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Drake, A. J.
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Fuhrmann, L.
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Giroletti, M.
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Hovatta, T.
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Max-Moerbeck, W.
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Porras, A.
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Readhead, A. C. ...
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Recillas, E.
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Richards, J. L.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Monthly notices ...
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Royal Institute of Technology