Multiwavelength Monitoring of the Enigmatic Narrow-Line Seyfert 1 PMN J0948+0022 in 2009 March - July
MetadataShow full item record
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.
Copyright © 2009 The American Astronomical Society ("AAS")
Showing items related by title, author, creator and subject.
Giroletti, M.; Paragi, Z.; Bignall, H.; Doi, A.; Foschini, L.; Gabányi, K. É.; Reynolds, C.; Blanchard, J.; Campbell, R. M.; Colomer, F.; Hong, X.; Kadler, M.; Kino, M.; van Langevelde, H. J.; Nagai, H.; Phillips, C.; Sekido, M.; Szomoru A.; Tzioumis A. K. (2011)Context: There is growing evidence of relativistic jets in radio-loud narrow-line Seyfert 1 (RL-NLS1) galaxies. Aims: We constrain the observational properties of the radio emission in the first RL-NLS1 galaxy ever ...
Giroletti, M.; Paragi, Z.; Bignall, Hayley; Doi, A.; Foschini, L.; Gabanyi, K.; Reynolds, Cormac (2011)We have performed three real-time e-VLBI observations of the radio loud NLS1 PMN J0948+0022 at 22 GHz, using a global array including telescopes in Europe, East Asia, and Australia, reaching a maximum baseline length of ...
Rapidly growing black holes and host galaxies in the distant Universe from the Herschel Radio Galaxy Evolution ProjectDrouart, G.; De Breuck, C.; Vernet, J.; Seymour, Nick; Lehnert, M.; Barthel, P.; Bauer, F.; Ibar, E.; Galametz, A.; Haas, M.; Hatch, N.; Mullaney, J.; Nesvadba, N.; Rocca-Volmerange, B.; Röttgering, H.; Stern, D.; Wylezalek, D. (2014)We present results from a comprehensive survey of 70 radio galaxies at redshifts 1 <z< 5.2 using the PACS and SPIRE instruments on board the Herschel Space Observatory. Combined with existing mid-IR photometry from the ...