The IR spectrum of the double QSO

Details The IR spectrum of the double QSO The IR spectrum of the double QSO

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.285..385l&link_type=abstract

Nature, vol. 285, June 5, 1980, p. 385, 386. NSF-supported research.

Astronomy and Astrophysics

Astronomy

11

Binary Stars, Infrared Astronomy, Quasars, Stellar Spectra, A Stars, B Stars, Elliptical Galaxies, Gravitational Effects, Infrared Spectra, Stellar Spectrophotometry

Scientific paper

The hypothesis that the double quasar 0957 + 561A,B (separation 6 arcsec and z = 1.4) is formed by a gravitational lens has found strong support from observations suggesting the presence of an intervening giant elliptical galaxy with z equal to approximately 0.4, separated from component B by less than 1 arcsec. According to the lens hypothesis the flux ratio of the two quasars should be the same at all wavelengths. Any difference observed should be due only to superposition on component B of emission from the lens galaxy, which is expected to be predominantly in the IR. New photometry at 1.25, 1.6 and 2.2 microns is here reported which strengthens the case for lens action and confirms that the lens galaxy is a giant elliptical.

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