VLBI observations of active galactic nuclei at 3 MM

Details VLBI observations of active galactic nuclei at 3 MM VLBI observations of active galactic nuclei at 3 MM

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257...31b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 1, p. 31-46.

Astronomy and Astrophysics

Astronomy

58

Active Galactic Nuclei, Radio Sources (Astronomy), Very Long Base Interferometry, Bl Lacertae Objects, Calibrating, Radio Jets (Astronomy), Radio Spectra

Scientific paper

Recent improvements in data analysis and receiver techniques have allowed us to produce maps of the 100 GHz emission from the compact cores of AGN with the unsurpassed resolution of 50/microarcsec. We present 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 AGN on size scales of 10 exp 16 - 10 exp 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 of about 21,000 km/sec. The radio source OJ287 is still unresolved with our array, having a core size of less than 10 exp 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.

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