Evidence for parsec-scale absorption from VSOP observations of the BL Lacertae object 0735+178 |
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| Authors: | DC Gabuzda JL Gómez I Agudo |
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| Institution: | 1Joint Institute for VLBI in Europe, Postbus 2, 7990 AA Dwingeloo, the Netherlands;2Astro Space Centre, Lebedev Physical Institute, 53 Leninsky Pr., 117924 Moscow, Russia;3Instituto de Astrofísica de Andalucía, CSIC, Apartado 3004, 18080 Granada, Spain |
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| Abstract: | VLBI total intensity and linear polarization images of the BL Lacertae object 0735+178 have been obtained at  using the  VLA as a ground array together with the HALCA orbiting antenna, and at  about a month later using the VLBA. The most surprising result to come from a comparison of these two images, which have nearly equivalent resolution, is that the path of the jet appears to be appreciably different at the two wavelengths. We have interpreted this as evidence for free–free absorption to the east of the core, near a bend of about 90° in the 2-cm image where the emission is very weak in the 6-cm image. Overall, the polarization structures seen in corresponding regions at the two wavelengths are in good agreement. We find tentative evidence for enhanced rotation measures near two sharp bends in the VLBI jet. |
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| Keywords: | polarization techniques: interferometric galaxies: active BL Lacertae objects: individual: 0735+178 galaxies: jets radio continuum: galaxies |
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