Multi-Frequency VLBI Observations of OT 081

Details Multi-Frequency VLBI Observations of OT 081 Multi-Frequency VLBI Observations of OT 081

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pasj...52.1037i&link_type=abstract

Publications of the Astronomical Society of Japan, v.52, p.1037-L1044.

Astronomy and Astrophysics

Astronomy

2

Bl Lacertae Objects: Individual (Ot 081=1749+096), Galaxies: Active, Radio Sources: Variable, Techniques: Interferometric

Scientific paper

We have observed OT 081 at 4.8, 8.4, 15, and 22 GHz, with the VLBI Space Observatory Programme (VSOP) and the Very-Long-Baseline Array (VLBA) after its radio burst on 1998 May. Multi-frequency VLBI images show a dominant component D and a weak component C1, which is a knot of the jet extending to the north-west direction. The derived physical parameters of component D are the Doppler factor, delta_eq ~ 32.0, the Lorentz factor of 16.0< Gamma < 16.9, and the viewing angle, phi < deg68. It appears that although delta_eq of component C1 is smallar than that of componet D by one order of magnitude, Gamma of component C1 is about twice the range as that of component D at the 1 sigma level. However, phi of component D is different from that of component C1. The rapid variability of the flux density of OT 081 is suggested to be due to the variation of phi .

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