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Astron. Astrophys. 323, L17-L20 (1997)

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Letter to the Editor

215 GHz VLBI observations of bright Active Galactic Nuclei

T.P. Krichbaum 1, D.A. Graham 1, A. Greve 2, J.E. Wink 2, J. Alcolea 3, F. Colomer 3, P. de Vicente 3, A. Baudry 4, J. Gómez-Gónzalez 3, M. Grewing 2 and A. Witzel 1

1 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
2 Institut de Radioastronomie Millimétrique, F-38406 St. Martin d'Hères, France
3 Centro Astronómico de Yebes, Apartado 148, E-19080 Guadalajara, Spain
4 Observatoire de Bordeaux and URA 352 de CNRS, BP 89, F-33270 Floirac, France

Received 11 March 1997 / Accepted 10 April 1997

Abstract

We report the detection of 6 active galactic nuclei, and also the marginal detection of the galactic center radio source SGR A*, in 215 GHz VLBI observations between the IRAM 30 m telescope on Pico Veleta and one 15 m antenna of the IRAM Plateau de Bure interferometer ([FORMULA] mas fringe spacing). In this (second) 1.4 mm VLBI-experiment we find source dependent ratios between the total and correlated flux densities in the range of 10-35 %, indicating partly resolved brightness distributions on sub-milliarcsecond scales. In view of the calibration uncertainties and the limited uv-coverage at this high frequency this needs further confirmation. The present detection limit of [FORMULA] Jy opens the possibility for more extended 1.4 mm VLBI experiments, in particular with phased millimeter arrays.

Send offprint requests to: T.P. Krichbaum

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© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998

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