The detection of gravitational lenses by radio autocorrelation

Details The detection of gravitational lenses by radio autocorrelation The detection of gravitational lenses by radio autocorrelation

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...403...20s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 403, no. 1, p. 20-25.

Statistics

Computation

4

Autocorrelation, Gravitational Lenses, Point Sources, Radio Astronomy, Computational Astrophysics, Galactic Halos, Radio Sources (Astronomy)

Scientific paper

The specifics of gravitational lensing by point masses are reviewed. The statistical properties of the fluctuations of the observed combined beam from a minilensed source are calculated. The change in the SNR ratio of the autocorrelation as a function of the size of the source is estimated. It is shown that even in the case of an unresolved image of a point source, the time delay between the two beams reveals the composite nature of the image. It is found that, if lenses prove to be common and easily observable, the statistics of the occurrences of events will yield the density and distribution of small objects in intervening galaxies. The distribution of lags in the autocorrelation is related to the mass of the lensed object through the parameter f. With samples of a few lensing events, it is possible to estimate the mass of the lensing objects.

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