Proposal code
v022
Proposal title
Investigation of three gravitational milli-lens candidates
The |
Investigators and their |
Affiliations |
| P.I. |
Peter Wilkinson |
Univ. Manchester, Jodrell Bank, UK |
| |
David Henstock |
Univ. Manchester, Jodrell Bank, UK |
Proposal Abstract
This is a proposal to examine three of the best gravitational
milli-lens candidates amongst 329 flat-spectrum sources examined
mainly during the CJ VLBI surveys. After systematic follow--up
observations with the VLBA there are relatively few surviving
candidates. We propose to observe the best three of these with VSOP at
5 GHz. We desire the maximum resolution in order to match that of
ground--based observations at 22 GHz. Two of the three candidates
require the Effelsberg and/or the phased VLA to be sure of good SNR to
VSOP. If there are no milli-lensed systems amongst the 329 sources then
uniformly distributed compact objects in the mass range
10^{6}--10^{9}M_{sun} cannot make a significant contribution
to the closure density of the Universe.
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may therefore have changed.