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2009 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 707, no 1, 727-737 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2009. Vol. 707, no 1, 727-737 p.
Keyword [en]
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
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-18993DOI: 10.1088/0004-637x/707/1/727ISI: 000272162900059ScopusID: 2-s2.0-72849117027OAI: diva2:337040

QC 20100525

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2016-04-21Bibliographically approved

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