Global e-VLBI observations of the gamma-ray narrow line Seyfert 1 PMN J0948+0022
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 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 ¥ias,
with a fainter component at a position angle ¥e i 35◦. Relativistic beaming is required by the observed brightness temperature of
3.4 i? 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.
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