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VLBI observations of active galactic nuclei at 3 MM
Onsala Space Observatory, Chalmers University of Technology, Gothenburg, Sweden.ORCID iD: 0000-0002-4826-019X
Haystack Observatory, Westford, MA, USA.
Nobeyama Radio Observatory, Nobeyama, Minamisaku, Nagano, Japan.
Owens Valley Observatory, Pasadena, CA, USA.
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1992 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 257, no 1, 31-46 p.Article in journal (Refereed) Published
Abstract [en]

Recent improvements in data analysis and receiver techniques have allowed us to produce maps of the 100 GHz emission from the compact cores of active galactic nuclei with the unsurpassed resolution of 50-mu-as (microarcseconds). We present here hybrid maps of a set of compact radio sources observed at two epochs with a global VLBI array. The high resolution enables us to show details of active galactic nuclei on size scales of 10(16)-10(17) cm. Jets are shown to be more curved in these inner parts than further out in the areas mapped with VLBI at lower frequencies. Our maps of the quasar 3C345 show that the curvature seen with lower resolution instruments continues very close to the core. New components are seen separating from the cores of 3C84 and BL Lac. We observe a component in 3C84 separating from the core with an apparent speed approximately 21000 km sec-1. The radio source OJ287 is still unresolved with our array, having a core size of less-than-or-similar-to 10(17) cm. There is no indication of any compact component in 3C279 which would be associated with the outburst in integrated flux density which happened some months before our observation. The flux density of the most compact component we observe in 3C279 agrees well with that of the quiet core as extrapolated from its radio spectrum at lower frequencies. The inner part of the radio jet of the giant elliptical galaxy M87 also shows a continuation of the structure on a larger size scale, with a structure we interpret as parts of a helical pattern. No fringes were found for 4C39.25 or Sgr A.

Place, publisher, year, edition, pages
Les Ulis: EDP Sciences, 1992. Vol. 257, no 1, 31-46 p.
Keyword [en]
radio galaxies, jets, hot spots, shocks, magnetic fields, relativity
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:hh:diva-22834ISI: A1992HM10600005OAI: oai:DiVA.org:hh-22834DiVA: diva2:629877
Note

The VLBI project at Onsala is supported by the Swedish National Science Foundation under grant F-FU 4876-302.

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

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