Publication Date:
2013-07-04
Description:
We report on multifrequency observations of the -ray emitting narrow-line Seyfert 1 galaxy PKS 1502+036 performed from radio to -rays during 2008 August–2012 November by Fermi -Large Area Telescope (LAT), Swift (X-ray Telescope and Ultraviolet/Optical Telescope), Owens Valley Radio Observatory, Very Long Baseline Array (VLBA) and Very Large Array. No significant variability has been observed in -rays, with 0.1–100 GeV flux that ranged between (3–7) x 10 –8 ph cm –2 s –1 using 3-month time bins. The photon index of the LAT spectrum ( = 2.60 ± 0.06) and the apparent isotropic -ray luminosity ( L 0.1-100 GeV = 7.8 x 10 45 erg s –1 ) over 51 months are typical of a flat spectrum radio quasar. The radio spectral variability and the one-sided structure, in addition to the observed -ray luminosity, suggest a relativistic jet with a high Doppler factor. In contrast to SBS 0846+513, the VLBA at 15 GHz did not observe superluminal motion for PKS 1502+036. Despite having the optical characteristics typical of a narrow-line Seyfert 1 galaxy, radio and -ray properties of PKS 1502+036 are found to be similar to those of a blazar at the low end of the black hole mass distribution for blazars. This is in agreement with what has been found in the case of the other -ray emitting narrow-line Seyfert 1 SBS 0846+513.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
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