view Abstract Citations (27) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Evidence for MG II lambda 2798 Profile Differences in the Gravitationally Lensed QSO 2237+0305A, B Filippenko, Alexei V. Abstract Long-slit near-infrared CCD spectra of the gravitational lens system 2237+0305 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+/-0.001. The high-quality Mg II λ2798 data for components A and B yield a relative velocity definitely smaller than 150 km s^-1^, and possibly <~ 50 km s^-1^. There are, however, slight differences in the Mg II profiles of A and B. The intrinsic variability time scale 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. Publication: The Astrophysical Journal Pub Date: March 1989 DOI: 10.1086/185398 Bibcode: 1989ApJ...338L..49F Keywords: Galactic Nuclei; Gravitational Lenses; Quasars; Red Shift; Spiral Galaxies; Charge Coupled Devices; Interstellar Extinction; Stellar Spectra; Astrophysics; GRAVITATIONAL LENSES; QUASARS full text sources ADS | data products SIMBAD (3) NED (2)
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