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Mark III VLBI Observations of the Nucleus of M81 at 2.3 and 8.3 GHz

Published online by Cambridge University Press:  14 August 2015

N. Bartel ,
B. E. Corey ,
I. I. Shapiro ,
A. E. E. Rogers ,
A. R. Whitney ,
D. A. Graham ,
J. D. Romney  and
R. A. Preston
N. Bartel
Affiliation:
Massachusetts Institute of Technology
B. E. Corey
Affiliation:
Massachusetts Institute of Technology
I. I. Shapiro
Affiliation:
Massachusetts Institute of Technology
A. E. E. Rogers
Affiliation:
Northeast Radio Observatory Corporation
A. R. Whitney
Affiliation:
Northeast Radio Observatory Corporation
D. A. Graham
Affiliation:
Max Planck Institut für Radioastronomie
J. D. Romney
Affiliation:
Max Planck Institut für Radioastronomie
R. A. Preston
Affiliation:
Jet Propulsion Laboratory

Extract

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The normal spiral galaxy M81, which has some characteristics of a Seyfert (Peimbert, Torres-Peimbert, 1981), has a flat spectrum in the radio range (de Bruyn et al., 1976), variable on the time scale of days (Crane et al., 1976), and detectable radiation at infrared (Rieke, Lebofsky, 1978) and X-ray wavelengths (Elvis, van Speybroeck, 1981). At a distance of ∼3.3 Mpc, M81 is the nearest extragalactic object with a nucleus detectable with VLBI (Kellermann et al., 1976). We report here on simultaneous VLBI observations made with the Mark III system at 2.3 and 8.3 GHz. Observations on 14 and 16 March 1981 utilized the 100 m diameter telescope in Effelsberg, W. Germany (MPIR); the 43 m telescope at Green Bank, WV (NRAO); and the 40 m telescope near Big Pine, CA (OVRO).

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 97: Extragalactic Radio Sources , 1982 , pp. 387 - 388
Copyright
Copyright © Reidel 1982 

References

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