Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100..146t&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 100, July 1990, p. 146-155.
Astronomy and Astrophysics
Astronomy
14
Galactic Nuclei, Gravitational Collapse, Gravitational Lenses, Image Reconstruction, Milky Way Galaxy, Analytic Functions, Astronomical Models, Charge Coupled Devices, Digital Filters, Galactic Bulge, Halos
Scientific paper
If the Galaxy possesses a dark halo of massive objects, they will produce small but potentially detectable distortions in the images of distant, extended objects due to gravitational lensing effects. An illustrative analytic and a more realistic numerical model are presented for calculating the number and angular sizes of these distortions, and a specific example of a digital filter is described which could be used for the identification of such distortions. The sensitivity of possible searches for the effect in the image of M31 and the Galactic Center are discussed in some detail. Simulated images of distortions of various angular sizes in these fields as they would be expected to appear in ground-based and Space Telescope CCD frames are presented. A Galactic halo of black holes such as that proposed by Lacey and Ostriker might well be detectable ina practically realizable experiment.
Schneider Donald P.
Turner Edwin L.
Wardle Mark J.
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