Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-01-18
Phys.Rev.Lett.86:584-587,2001
Astronomy and Astrophysics
Astrophysics
2 figures
Scientific paper
10.1103/PhysRevLett.86.584
Using Very Long Baseline Interferometry we have searched a sample of 300 compact radio sources for examples of multiple imaging produced by gravitational lensing; no multiple images were found with separations in the angular range 1.5--50 milliarcsec. This null result allows us to place a limit on the cosmological abundance of intergalactic supermassive compact objects in the mass range $\sim 10^{6}$ to $\sim 10^{8}$M$_{\odot}$; such objects cannot make up more than $\sim 1%$ of the closure density (95% confidence). A uniformly distributed population of supermassive black holes forming soon after the Big Bang do not, therefore, contribute significantly to the dark matter content of the Universe.
Augusto Pedro
Browne I. W. A.
Henstock D. R.
Pearson Timothy. J.
Polatidis Antonis G.
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