Abstract
We report the new spectroscopic observations of the gravitational lens RXJ 021+4529 with the multi-mode focal reducer SCORPIO of the SAO RAS 6 m telescope. The new spectral observations were compared with the previously observed spectra of components A and B of RXJ 0921+4529, i.e., the same components observed in different epochs. We found a significant difference in the spectrum between the components that cannot be explained with microlensing and/or spectral variation. We conclude that RXJ 0921+4529 is a binary quasar system, where redshifts of quasars A and B are 1.6535 ± 0.0005 and 1.6625 ± 0.0015, respectively. © 2010. The American Astronomical Society. All rights reserved.
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Popović, L. Č., Moiseev, A. V., Mediavilla, E., Jovanović, P., Ilić, D., Kova Čević, J., & Muñoz, J. A. (2010). RXJ 0921+4529: A binary quasar or a gravitational lens? Astrophysical Journal Letters, 721(2 PART 2). https://doi.org/10.1088/2041-8205/721/2/L139
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