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5 Years of VLBI and X-Ray Observations of NRAO 140

Published online by Cambridge University Press:  03 August 2017

Alan P. Marscher
Alan P. Marscher*
Affiliation:
Department of Astronomy, Boston University, 725 Commonwealth Ave., Boston, MA 02215, U.S.A.

Abstract

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The author and his collaborators have observed NRAO 140 twice at X-ray energies and numerous times with multifrequency VLBI. The VLBI observations reveal a knotty jet structure with superluminal motion of the innermost two knots relative to the core. The VLBI core decreased by about a factor of 2 in flux density between 1980 and late 1984. The X-ray flux also declined by about the same factor during this period. Monitoring at 18 cm during periods of low-frequency variability has revealed pronounced changes in the relative brightnesses of the components of the source while the total flux density has varied by ≲ 10%.

Type
Extragalactic
Information
Symposium - International Astronomical Union , Volume 129: The Impact of VLBI on Astrophysics and Geophysics , 1988 , pp. 35 - 36
Copyright
Copyright © Reidel 1988 

References

Marscher, A.P. 1987a, Ap. J., submitted.Google Scholar
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Marscher, A.P., Rickett, B.J., Padrielli, L., Bartel, N., and Romney, J.D. 1987b, in preparation.Google Scholar
Owen, F.N., Helfand, D.J., and Spangler, S.R. 1981, Ap. J. (Letters), 250, L55.Google Scholar