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MULTIWAVELENGTH MON...
MULTIWAVELENGTH MONITORING OF THE ENIGMATIC NARROW-LINE SEYFERT 1 PMN J0948+0022 IN 2009 MARCH-JULY
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Abdo, A. A. (author)
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Ackermann, M. (author)
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Ajello, M. (author)
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Axelsson, Magnus (author)
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Johannesson, G. (author)
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Johnson, A. S. (author)
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- Ryde, Felix (author)
- KTH,Partikel- och astropartikelfysik
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Wagner, S. (author)
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- Conrad, Jan (author)
- KTH,Partikel- och astropartikelfysik
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- Jackson, Miranda (author)
- KTH,Partikel- och astropartikelfysik
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- Mc Glynn, Sinéad (author)
- KTH,Partikel- och astropartikelfysik
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- Ylinen, Tomi (author)
- KTH,Partikel- och astropartikelfysik
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(creator_code:org_t)
- 2009-11-25
- 2009
- English.
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In: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 707:1, s. 727-737
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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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- Following the recent discovery of gamma rays from the radio-loud narrow-line Seyfert 1 galaxy PMN J0948+0022 (z = 0.5846), we started a multiwavelength campaign from radio to gamma rays, which was carried out between the end of 2009 March and the beginning of July. The source displayed activity at all the observed wavelengths: a general decreasing trend from optical to gamma-ray frequencies was followed by an increase of radio emission after less than two months from the peak of the gamma-ray emission. The largest flux change, about a factor of about 4, occurred in the X-ray band. The smallest was at ultraviolet and near-infrared frequencies, where the rate of the detected photons dropped by a factor 1.6-1.9. At optical wavelengths, where the sampling rate was the highest, it was possible to observe day scale variability, with flux variations up to a factor of about 3. The behavior of PMN J0948+0022 observed in this campaign and the calculated power carried out by its jet in the form of protons, electrons, radiation, and magnetic field are quite similar to that of blazars, specifically of flat-spectrum radio quasars. These results confirm the idea that radio-loud narrow-line Seyfert 1 galaxies host relativistic jets with power similar to that of average blazars.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- galaxies: active
- gamma rays: observations
- infrared: galaxies
- quasars: individual (PMN J0948+0022)
- radio continuum: galaxies
- ultraviolet: galaxies
- X-rays: galaxies
- active galactic nuclei
- large-area telescope
- gamma-ray emission
- radio
- galaxies
- jets
- variability
- calibration
- radiation
- mission
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Abdo, A. A.
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Ackermann, M.
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Ajello, M.
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Axelsson, Magnus
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Johannesson, G.
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Johnson, A. S.
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show more...
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Ryde, Felix
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Wagner, S.
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Conrad, Jan
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Jackson, Miranda
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Mc Glynn, Sinéad
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Ylinen, Tomi
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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 ...
- Articles in the publication
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Astrophysical Jo ...
- By the university
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Royal Institute of Technology