Mutual coherence of gravitationally lensed images

Details Mutual coherence of gravitationally lensed images Mutual coherence of gravitationally lensed images

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...148..369s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 148, no. 2, July 1985, p. 369-378.

Astronomy and Astrophysics

Astrophysics

22

Coherent Electromagnetic Radiation, Cosmology, Gravitational Lenses, Intergalactic Media, Quasars, Very Long Base Interferometry, Astronomical Models, Cross Correlation, Missing Mass (Astrophysics), Schwarzschild Metric, Stellar Mass

Scientific paper

The mutual coherence of two images of a distant source, both focussed into a telescope by an intervening gravitational lens, is investigated for the case of stellar-mass lenses. The degree of coherence is given as a function of the source's physical parameters (extent and shape, intensity distribution over surface, sharpness of edge) and its detectability is discussed. The lensing configuration is likened to a VLBI experiment of extremely long baseline. Effects of inhomogeneous intergalactic plasma on coherence, and of lensing amplification on source counts are studied. It is stressed that a measurement of the mutual coherence could prove the existence of dark stellar mass objects (missing mass problem) and of an inhomogeneous intergalactic matter.

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