RXJ 0921+4529: A Binary Quasar or a Gravitational Lens?

Popović, L. Č.; Moiseev, A. V.; Mediavilla, E.; Jovanović, P.; Ilić, D.; Kovačević, J.; Muñoz, J. A.
Bibliographical reference

The Astrophysical Journal Letters, Volume 721, Issue 2, pp. L139-L142 (2010).

Advertised on:
10
2010
Number of authors
7
IAC number of authors
1
Citations
4
Refereed citations
4
Description
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.
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