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Global e-VLBI observations of the gamma-ray narrow line Seyfert 1 PMN J0948+0022


Giroletti, M and Paragi, Z and Bignall, H and Doi, A and Foschini, L and Gabanyi, KE and Reynolds, C and Blanchard, J and Campbell, RM and Colomer, F and Hong, X and Kadler, M and Kino, M and van Langevelde, HJ and Nagai, H and Phillips, C and Sekido, M and Szomoru, A and Tzioumis, AK, Global e-VLBI observations of the gamma-ray narrow line Seyfert 1 PMN J0948+0022, Astronomy and Astrophysics: A European Journal, 528, (Apr) EJ ISSN 0004-6361 (2011) [Refereed Article]

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Copyright Statement

Copyright EDP Sciences, 2011

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DOI: doi:10.1051/0004-6361/201116639


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 detected in gamma-rays, PMN J0948+0022, i.e., its flux density and structure in both total intensity and polarization, its compactness, and variability. Methods. We performed three real-time e-VLBI observations of PMN J0948+0022 at 22 GHz, using a global array including telescopes in Europe, East Asia, and Australia. These are the first e-VLBI science observations ever carried out with a global array, reaching a maximum baseline length of 12 458 km. The observations were part of a large multiwavelength campaign in 2009. Results. The source is detected at all three epochs. The structure is dominated by a bright component, more compact than 55 as, with a fainter component at a position angle 35◦. Relativistic beaming is required by the observed brightness temperature of 3.4 1011 K. Polarization is detected at a level of about 1%. Conclusions. The parameters derived by the VLBI observations, in addition to the broad-band properties, confirm that PMN J0948+0022 is similar to flat spectrum radio quasars. Global e-VLBI is a reliable and promising technique for future studies.

Item Details

Item Type:Refereed Article
Keywords:galaxies: active galaxies: Seyfert galaxies: jets instrumentation: high angular resolution
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Blanchard, J (Mr Jay Blanchard)
ID Code:69572
Year Published:2011
Web of Science® Times Cited:30
Deposited By:Mathematics and Physics
Deposited On:2011-04-29
Last Modified:2012-03-21

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