Discovery of a new gravitational lens

Details Discovery of a new gravitational lens Discovery of a new gravitational lens

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282l...1d&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 282, July 1, 1984, p. L1-L4.

Other

59

Astronomical Spectroscopy, Gravitational Lenses, Quasars, Astronomical Photography, Charge Coupled Devices, Red Shift

Scientific paper

The faint QSO pair 1635 + 267 A + B, discovered in a slitless spectroscopy survey by Weedman (1982), are found to be at practically the same redshift of 1.961 + or - 0.003. Their redshift difference, determined with a cross-correlation technique, is found to be (3.2 + or - 8.5) x 10 to the -4th, which corresponds to a rest-frame velocity difference of only (33 + or - 86) km/s. This low value and the similarity of the spectra strongly argue that this is another case of a gravitational lens. Deep CCD images do not reveal the presence of a lensing object more than an arcsec away from either QSO image down to a red magnitude of 23.5. An absorption feature in the spectrum of the brighter QSO image may be a signature of the lens galaxy. This line is interpreted as the Mg II 2799 doublet, seen at redshift 1.118.

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