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A Search for Gravitational Milli–Lenses

Published online by Cambridge University Press:  25 May 2016

P.N. Wilkinson ,
D.R. Henstock ,
I.W.A. Browne ,
A.C.S. Readhead ,
G.B. Taylor ,
R.C. Vermeulen ,
T.J. Pearson  and
W. Xu
P.N. Wilkinson
Affiliation:
University of Manchester, NRAL, Jodrell Bank, Macclesfield, Cheshire, SK11 9DL, UK
D.R. Henstock
Affiliation:
University of Manchester, NRAL, Jodrell Bank, Macclesfield, Cheshire, SK11 9DL, UK
I.W.A. Browne
Affiliation:
University of Manchester, NRAL, Jodrell Bank, Macclesfield, Cheshire, SK11 9DL, UK
A.C.S. Readhead
Affiliation:
California Institute of Technology, OVRO, Robinson 105-24, Pasadena, CA 91125 USA
G.B. Taylor
Affiliation:
California Institute of Technology, OVRO, Robinson 105-24, Pasadena, CA 91125 USA
R.C. Vermeulen
Affiliation:
California Institute of Technology, OVRO, Robinson 105-24, Pasadena, CA 91125 USA
T.J. Pearson
Affiliation:
California Institute of Technology, OVRO, Robinson 105-24, Pasadena, CA 91125 USA
W. Xu
Affiliation:
California Institute of Technology, OVRO, Robinson 105-24, Pasadena, CA 91125 USA

Abstract

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We have searched for gravitational milli–lens systems by examining VLBI maps of ~ 300 flat–spectrum radio sources. So far we have followed up 7 candidates, with separations in the range 2–20 mas. None have been confirmed as lenses but several of them can not yet be definitively ruled out. If there are no milli-lenses in this sample then uniformly–distributed black holes of 106 to 108 M⊙ cannot contribute more than ~ 1% of the closure density.

Type
Part I: Invited Reviews
Information
Symposium - International Astronomical Union , Volume 168: Examining the Big Bang and the Diffuse Background Radiations , 1996 , pp. 95 - 98
Copyright
Copyright © Kluwer 1996 

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