Where have all the lenses gone?

Details Where have all the lenses gone? Where have all the lenses gone?

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99.1700k&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, June 1990, p. 1700-1708. Research supported by NSF.

Mathematics

Probability

26

Extragalactic Radio Sources, Gravitational Lenses, Probability Theory, Radio Emission, Red Shift, Sky Surveys (Astronomy), Very Large Array (Vla)

Scientific paper

The probability that the extended emission of extragalactic radio sources is gravitationally lensed is computed. This leads to the prediction of a new class of lenses - small ring images embedded in much larger regions of radio emission. Three out of every four lenses in the MIT-Green Bank (MG) survey should be of this type. The current lens search based on the MG survey does not find this class because of the effects of resolution and selection criteria. These lenses in principle allow the lens potential to be studied on a wide range of scales, unlike the current radio rings which sample the lens potential only near the critical line. A mixed radio-optical survey is suggested for locating these lenses.

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