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Multiple quasar may indicate another gravitational lens

SEP 01, 1980

DOI: 10.1063/1.2914270

Gloria B. Lubkin

Early last year a pair of quasars—0957+561 A and B—was found whose spectra were almost identical. By now it is generally believed that these twin quasars are in fact a single quasar that is multiply imaged by a gravitational lens. Recent observations and model calculations suggest that this gravitational lens effect is produced primarily by the brightest member, G1, of a cluster of galaxies, with the other members collectively producing an important effect.

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© 1980 American Institute of Physics
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This Content Appeared In
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Volume 33, Number 9

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