Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358....5n&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 358, July 20, 1990, p. 5-17.
Astronomy and Astrophysics
Astronomy
9
Black Holes (Astronomy), Cosmology, Gravitational Lenses, Quasars, Red Shift, Telescopes, Very Long Base Interferometry
Scientific paper
The limits that gravitational lensing can place on a critical universe completely filled with randomly distributed black holes (BHs) and 1/10 filled with BHs are investigated. Specifically, the fraction of QSOs split is calculated, such that two distinct images would be observable to modern telescopes. It is found that lens search programs at dim surface brightnesses or high QSO redshift would find a large fraction of lens-induced image pairs to have one image significantly dimmer than the other: 5 mag or more. Nondetection of QSO pairs or counterimages with modern optical telescopes can rule out cosmological BHs of M greater than 10 to the 12th solar masses. It is predicted that the Hubble Space Telescope will either reduce this upper bound significantly or discover a significant number of dim QSO lens induced counterimages with separations between 0.1 arcsec and 1 arcsec. Similarly, very long baseline interferometry measurements have the capability of reducing the upper bound still further, down to 100,000 solar masses, or discovering a significant number of dim counterimages at an angular distance greater than 0.001 arcsec from bright, distant quasars.
Bistolas Vassilios G.
Nemiroff Robert J.
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