Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338l..49f&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 338, March 15, 1989, p. L49-L52. Research supported by the Univer
Astronomy and Astrophysics
Astrophysics
25
Galactic Nuclei, Gravitational Lenses, Quasars, Red Shift, Spiral Galaxies, Charge Coupled Devices, Interstellar Extinction, Stellar Spectra
Scientific paper
The results of long-slit near-IR CCD spectroscopy of the gravitationally lensed QSO 2237 + 0305 are reported. The findings confirm that at least three of the four starlike images in the central region of the z = 0.0394 galaxy are QSOs with redshift 1.696 + or - 0.001. A relative velocity definitely smaller than 150 km/s and possibly less than about 50 km/s is found for the components A and B. Evidence is found for slight differences in the profiles of Mg II 2798 A in these components. The intrinsic variability timescale of typical QSOs is much longer than the maximum relative time delay between A and B. Hence, the most likely explanation is that the two images sample different portions of the QSO's broad-line region.
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