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RXJ 0921+4529: a binary quasar or gravitational lens?

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arxiv 1008.4156 v1 pith:PFH24OYD submitted 2010-08-24 astro-ph.CO

RXJ 0921+4529: a binary quasar or gravitational lens?

L. \v{C}. Popovi\'c , A. V. Moiseev , E. Mediavilla , P. Jovanovi\'c , D. Ili\'c , J. Kova\v{c}evi\'c , J. Mu\~noz This is my paper
classification astro-ph.CO
keywords componentsbinarygravitationallensobservationsobservedquasarspectral
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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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