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Superluminal Motion in BL Lacertae: 10.65 GHz VLBI observations from 1981.7 to 1982.7

Published online by Cambridge University Press:  04 August 2017

R. L. Mutel  and
R. B. Phillips
R. L. Mutel
Affiliation:
Dept. Physics & Astron., Univ. of Iowa, Iowa City, IA
R. B. Phillips
Affiliation:
Haystack Observatory, Westford, MA

Extract

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We report here VLBI observations at four epochs of the source BL Lacertae made with the U.S. VLBI Network (plus Bonn) at 10.65 GHz which show clear evidence of uniform superluminal expansion at v/c = 4.4 ± 0.2 (H0 = 55 km s−1 mpc−1). The maps, which were made every three months from 1981.76 to 1982.75 (Figures 1, 2), were part of an ongoing program of VLBI observations of BL Lacertae at 5 and 10.65 GHz starting in 1980.4, near the beginning of a series of violent flux outbursts (Aller, Hodge, and Aller, 1983; Aller and Aller, 1984). Previous results from earlier epochs have been reported by Mutel, Aller, and Phillips (1981) and Phillips and Mutel (1982).

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 110: VLBI and Compact Radio Sources , 1984 , pp. 117 - 118
Copyright
Copyright © Reidel 1984 

References

Aller, H. D. and Aller, M. F.: 1984, this volume, p. 119.Google Scholar
Aller, H. D., Hodge, P. E., and Aller, M. F.: 1983, Astrophys. J., in press.Google Scholar
Bäath, L.: 1983, private communication.Google Scholar
Mutel, R. L., Aller, H. D., and Phillips, R. B.: 1981, Nature 294, p. 236.Google Scholar
Pearson, I. J. and Readhead, A. E. E.: 1984, this volume, p. 15.Google Scholar
Phillips, R.B. and Mutel, R.L., 1982, Ap. J. (Letters), 257, L19 Google Scholar