BL Lac Object 0735+178

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About this Image

These images of 0735+178, obtained by Gómez, Agudo, Marscher, Alberdi & Gabuzda ( Gómez et al. 1999), provide the highest resolution observations of this source to date, revealing a twisted jet in the inner regions of 0735+178. Two sharp projected bends of 90 deg. can be observed within 2 mas (1 mas=3.3 pc at the distance of 0735+178, z=0.424) from the core. The magnetic field appears to smoothly follow one of the bends in the jet, suggesting that this structure may be the result of a precessing nozzle in the jet of 0735+178.

In order to test this hypothesis we have performed 3D hydrodynamic relativistic simulations of a precessing jet, using the numerical code developed by Aloy, Marti, & Ibañez ( Aloy et al. 2000, and references therein). The images to the left show the time evolution (from top to bottom) of the expected emission from a precessing jet, when viewed at 10 deg. A twisted jet structure, similar to that observed in 0735+178, can easily be distinguished.

Further VLBA observations, in progress, should provide the necessary information to test whether the fluid in the jet of 0735+178 moves ballistically away from the core, or in such a way that the fluid velocity vectors remain parallel to the jet axis. This will provide information regarding the hydrodynamic properties of the jet in 0735+178, as well as the ambient medium through which it propagates.

Investigator(s):  Gómez, Agudo, Marscher, Alberdi and Gabuzda

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Technical Data

    Telescope VLBA 
    Date of Observation 1996-11-00 
    Type of Observation Continuum Observations 
    Center of Image RA: 07:38:7.40, Dec: 17:42:19.00 (J2000)  
    Field of View 0.0000 x 0.0000 degrees  
    Technical Caption Left panel: 22 GHz; right panel: 43 GHz  

  • Astronomical database entries for [HB89] 0735 178
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