VLBI observations of the 0957 + 561 gravitational lens systemA series of VLBI observations of the gravitational lens system 0957 + 561 at a wavelength of 13 cm has yielded the positions of the A and B images, the relative magnification of their largest discernible radio structures, and the time variability of their smallest discernible radio structures. These observations have also allowed upper limits to be placed on the flux density of an expected third image. The positions and relative magnification of the A and B images provide new information with which to constrain models of the lens that forms the images. The detection of variations in the flux densities of the cores of A and B suggests that observations at shorter wavelengths may reveal superluminal motion, which may in turn provide a means to measure the relative time delay.
Document ID
19890026373
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Gorenstein, M. V. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Falco, E. E. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Shapiro, I. I. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Bartel, N. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Bonometti, R. J. (MIT Cambridge, MA, United States)
Cohen, N. L. (Cornell University Ithaca, NY, United States)
Rogers, A. E. E. (Haystack Observatory Westford, MA, United States)
Marcaide, J. M. (Consejo Superior de Investigaciones Cientificas Instituto de Astrofisica de Andalucia, Granada, Spain)
Clark, T. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Subject Category
Astrophysics
Meeting Information
Meeting: IAU Symposium on the Impace of VLBI on Astrophysics and Geophysics