Limits on the cosmological abundance of supermassive compact objects from a search for multiple imaging in compact radio sources

Abstract

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.

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References in corpus (1)

• Limits on the cosmological abundance of supermassive compact objects from a millilensing search in gamma-ray burst data

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