Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250...50b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 1, Oct. 1991, p. 50-56. Research supported by Royal Society.
Astronomy and Astrophysics
Astronomy
17
Bl Lacertae Objects, Cosmology, Radio Jets (Astronomy), Continuous Radiation, Quasars
Scientific paper
This paper discusses a radio outburst in the BL Lac-object 0735 + 178 which started in early 1988, ended during 1990 and was succeeded by a new outburst which is still in progress. The image obtained with a global VLBI network shows the source to consist mainly of a core-jet like structure ending in diffuse emission region of low surface brightness located to the east of the core. Two new components as having been produced during the late 1980's are identified. They are moving out with apparent superluminal motion in a viewing angle of about more than 10 deg at a distance of about less than 2 mas from the core. The core includes another new component, but resolution is just sufficient to resolve out this component from the core at the epoch of observation. It is suggested that the weak emission region is caused by an older component reaching the point at which the Doppler boosting is at its maximum and that the long-time scale flux variations are due to successive events when evolved components reach that point.
Baath Lars B.
Chu Hong Son
Zhang Fu-Jing
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