0957 + 561 A, B - Twin quasistellar objects or gravitational lens

Details 0957 + 561 A, B - Twin quasistellar objects or gravitational lens 0957 + 561 A, B - Twin quasistellar objects or gravitational lens

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.279..381w&link_type=abstract

Nature, vol. 279, May 31, 1979, p. 381-384. Research supported by the Science Research Council

Physics

507

Emission Spectra, Gravitational Lenses, Quasars, Stellar Spectra, Absorption Spectra, Radio Spectroscopy, Spectrum Analysis

Scientific paper

Within the field of the source 0957 + 561 is a close pair of blue stellar objects of magnitude 17 with a separation of 5.7 arc sec at redshift 1.405. The two sources show great similarity in their spectral characteristics. A conventional interpretation could regard as coincidence the similarity of emission spectra, or assume that the initial conditions, age and environment of the two quasars are practically identical. A less conventional view would find the quasars to be two images of the same object produced by a gravitational lens.

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