Change search
ReferencesLink to record
Permanent link

Direct link
Multiwavelength Monitoring of the Enigmatic Narrow-Line Seyfert 1 PMN J0948+0022 in 2009 March-July
Stockholm University, Faculty of Science, Department of Astronomy.
Show others and affiliations
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 γ rays from the radio-loud narrow-line Seyfert 1 galaxy PMN J0948+0022 (z = 0.5846), we started a multiwavelength campaign from radio to γ 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 γ-ray frequencies was followed by an increase of radio emission after less than two months from the peak of the γ-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
National Category
Astronomy, Astrophysics and Cosmology Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-33757DOI: 10.1088/0004-637X/707/1/727ISI: 000272162900059ISBN: 0004-637XOAI: diva2:283658
Available from: 2009-12-29 Created: 2009-12-28 Last updated: 2011-02-15Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Axelsson, M.
By organisation
Department of AstronomyDepartment of Physics
In the same journal
Astrophysical Journal
Astronomy, Astrophysics and CosmologyAstronomy, Astrophysics and Cosmology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 69 hits
ReferencesLink to record
Permanent link

Direct link