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Global e-VLBI observations of the gamma-ray narrow line Seyfert 1 PMN J0948+0022
Citation
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
Official URL: http://publications.edpsciences.org/
DOI: doi:10.1051/0004-6361/201116639
Abstract
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 ¥ìas,
with a fainter component at a position angle ¥è ¡ 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 |
| Downloads: | 0 |
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