Spectral differences in the QSO pairs Q1634 + 267A,B and Q2345 + 007A,B and the gravitational lens interpretation

Details Spectral differences in the QSO pairs Q1634 + 267A,B and Q2345 + 007A,B and the gravitational lens interpretation Spectral differences in the QSO pairs Q1634 + 267A,B and Q2345 + 007A,B and the gravitational lens interpretation

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102.1610s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, Nov. 1991, p. 1610-1626.

Astronomy and Astrophysics

Astronomy

33

Emission Spectra, Gravitational Lenses, Quasars, Astronomical Spectroscopy, Binary Stars, Intergalactic Media, Lyman Alpha Radiation

Scientific paper

High S/N spectra of two candidate gravitational lens pairs, over the wavelength range 3150-7000 A at 4-6 A resolution are obtained in order to compare the emission line, continuum, and absorption line properties. The continuum shapes of Q1634 + 267A,B over the observed wavelength range agree remarkably well, and a constant multiplicative factor of 3.28 is found for the ratio A/B over the whole observed wavelength range. In agreement with previous investigations, it is found that the redshifts of the C III 1909 emission line are consistent with zero relative velocity shift and that the line profiles in the two images are identical. The continua of Q2345 + 007A and B match fairly well over the whole observed wavelength range if a constant scaling factor of 2.51 is used. Scaled difference spectra show that the Ly-alpha, NV, CIII, and Fe II emission lines are stronger relative to the continuum in Q2345 + 007B than in A. It is concluded that the pairs of images constituting Q1634 + 267A and B and Q2345 + 007A and B both result from gravitatinal lensing.

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