The mutual coherence of the images of gravitationally lensed objects

Details The mutual coherence of the images of gravitationally lensed objects The mutual coherence of the images of gravitationally lensed objects

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983liaco..24..131s&link_type=abstract

IN: Quasars and gravitational lenses; Proceedings of the Twenty-fourth Liege International Astrophysical Colloquium, Cointe-Ougr

Statistics

2

Coherence Coefficient, Gravitational Lenses, Image Correlators, Coherent Light, Intergalactic Media, Red Shift, Very Long Base Interferometry

Scientific paper

The mutual coherence gamma(tau) of unresolved images of gravitationally lensed sources depends on: (1) the intensity distribution over the source; (2) the lens properties; and (3) the distance to lens and source. The gravitational lens geometry is equivalent to a VLBI setup with huge (but fixed) baseline. For simple situations, exact results for gamma(tau) are derived and compared to calculations for the VLBI case. Measurements of gamma(tau) could detect lens events caused by stars, and an inhomogeneous component of an intergalactic plasma. Although the amplitude of gamma(tau) is small for likely situations, one can obtain huge quantities of statistics by which detectable results could be yielded.

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