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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
Marscher, A.P. 1987b, Ap. J. (Letters), submitted.Google Scholar
Marscher, A.P., and Broderick, J.J. 1981, Ap. J. (Letters), 247, L49.Google Scholar
Marscher, A.P., Broderick, J.J., Padrielli, L., Bartel, N., and Romney, J.D. 1987a, Ap. J., 319, in press.Google Scholar
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