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0735+178: The cosmic conspiracy
Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden.ORCID iD: 0000-0002-4826-019X
Nuffield Radio Astronomy Laboratories, Jodrell Bank, Macclesfield, Cheshire, United Kingdom.
Purple Mountain Observatory, Nanjing, China.
1991 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 250, no 1, 50-56 p.Article in journal (Refereed) Published
Abstract [en]

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. Our image obtained with a global VLBI network shows the source to mainly consist of a core-jet like structure ending in diffuse emission region of low surface brightness located to the east of the core. We identify two new components as having been produced during the late 1980's. They are moving out with apparent superluminal motion in a viewing angle of greater-than-or-similar-to 10-degrees at a distance of less-than-or-similar-to 2 mas from the core. The core includes another new component, but our resolution is just sufficient to resolve out this component from the core at our epoch of observation. We suggest 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 variation are due to successive events when evolved components reach that point.

Place, publisher, year, edition, pages
Les Ulis: EDP Sciences, 1991. Vol. 250, no 1, 50-56 p.
Keyword [en]
Bl Lacertae Objects, Cosmology, Radio Jets (Astronomy), Continuous Radiation, Quasars
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:hh:diva-22821ISI: A1991GK74400006OAI: oai:DiVA.org:hh-22821DiVA: diva2:629874
Note

FJZ is financially supported by the Royal Society K.C. Wong Fellowship, U.K.

Available from: 2013-06-17 Created: 2013-06-17 Last updated: 2015-10-27Bibliographically approved

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Citation style
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