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
TL;DR
This study presents spectroscopic evidence that RXJ 0921+4529 is a binary quasar system, not a gravitational lens, based on spectral differences observed over multiple epochs.
Contribution
The paper provides new spectroscopic data and analysis confirming RXJ 0921+4529 as a binary quasar rather than a gravitational lens, clarifying its nature.
Findings
Spectral differences between components A and B cannot be explained by microlensing.
Redshifts of quasars A and B are 1.6535 and 1.6625, respectively.
Spectroscopic observations over different epochs support the binary quasar interpretation.
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.
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