A Precessing Beam in Radio Quasar 0153+744

Details A Precessing Beam in Radio Quasar 0153+744 A Precessing Beam in Radio Quasar 0153+744

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.1208h&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #12.08; Bulletin of the American Astronomical Society, Vol. 27, p.1299

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new high resolution VLBI maps of the radio structure of quasar 0153+744 (z=2.34) at lambda lambda 6cm and 1.3cm, showing its jet to undergo a full 180 degree turn between the core component (A) and a bright secondary component (B) only 10 milliarcseconds away. Using maps published for earlier epochs, we conclude that component B is stationary and place an upper limit of 0.5c (H_0=100km/s/Mpc, q_0=0.5) on any apparent motion. No component motions are found in the jet either. The core is resolved at 1.3cm wavelength into a core-jet structure with four distinct components, whereas B consists of diffuse emission. Using B as a reference position, we measure a dependence of the core peak brightness position with wavelength. No extended emission is found on scales larger than about 1 arcsecond from VLA maps made at 20cm in A and C configuration. We discuss a model of a mildly relativistic precessing jet for the 0153+744, and show that a reasonable fit to the observed properties of the radio structure is achieved.

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