0957+561 A, B: twin quasistellar objects or gravitational lens?
Abstract
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.
- Publication:
-
Nature
- Pub Date:
- May 1979
- DOI:
- 10.1038/279381a0
- Bibcode:
- 1979Natur.279..381W
- Keywords:
-
- Emission Spectra;
- Gravitational Lenses;
- Quasars;
- Stellar Spectra;
- Absorption Spectra;
- Radio Spectroscopy;
- Spectrum Analysis;
- Astrophysics;
- EMISSION SPECTRA;
- GRAVITATIONAL LENSES;
- QUASARS;
- STELLAR SPECTRA;
- ABSORPTION SPECTRA;
- RADIO SPECTROSCOPY;
- SPECTRUM ANALYSIS