The radio structure of BL Lac object S5 2007+777

Details The radio structure of BL Lac object S5 2007+777 The radio structure of BL Lac object S5 2007+777

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010scchg..53s.187w&link_type=abstract

Science China Physics, Mechanics and Astronomy, Volume 53, Issue 1, pp.187-190

Astronomy and Astrophysics

Astronomy

Active Galactic Nuclei, Vlbi, Bl Lac Objects

Scientific paper

BL Lac object S5 2007+777 has been classified as a HYMOR (Hybrid Morphology radio source) for its hybrid FR I and FR II radio morphology. It is one of four BL Lac objects with a kpc scale extended X-ray jet. In this paper, we searched the unpublished European VLBI Network (EVN) archived high resolution data for this source, and present the high resolution radio structure. The EVN images all show a core-jet structure in 1.6, 5 and 8 GHz. In combination with the VLA data in the literature, we found position angle differences (ΔPA) of about 10°-20° between pc and kpc scale jet structures. The brightness temperature estimated from multi-band EVN images are around 1011.2-1011.8 K, from which the Doppler factor ranges from 3.2 to 12.0. We found significant flux variations of the radio core in 1.6 and 5 GHz, from which we derived the variability in brightness temperature T var to be 1013.6 K and 1014.0 K, corresponding to the Doppler factors of 9.3 and 12.4, respectively.

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