The gravitational lens effect and pregalactic halo objects

Details The gravitational lens effect and pregalactic halo objects The gravitational lens effect and pregalactic halo objects

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233..402b&link_type=abstract

Astrophysical Journal, Part 1, vol. 233, Oct. 15, 1979, p. 402-410.

Astronomy and Astrophysics

Astronomy

26

Black Holes (Astronomy), Cosmology, Gravitational Effects, Relativity, Astronomical Photography, Extragalactic Radio Sources, H Ii Regions, Halos, Imaging Techniques, Lenses, Quasars, Ray Tracing

Scientific paper

The changes in flux, position, and size of a distant extended (galaxy, etc.) source that result from the gravitational-lens action of a massive opaque object are discussed. The flux increase is described by a single function of two parameters. One of these parameters characterizes the strength of the gravitational lens, the other describes the alignment of source and lens object. This function also describes the relative intensity of the images formed by the lens. The formalism is applied to the problem of the Galactic halo. It appears that a massive (1 trillion solar masses) spherical halo surrounding the visible part of the Galaxy is consistent with the observable properties of extragalactic sources (distant galaxies, H II regions in distant galaxies, quasars).

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