Issue |
A&A
Volume 406, Number 2, August I 2003
|
|
---|---|---|
Page(s) | L43 - L46 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:20030904 | |
Published online | 17 November 2003 |
Letter to the Editor
A quadruply imaged quasar with an optical Einstein ring candidate: 1RXS J113155.4–123155*
1
Institut d'Astrophysique et de Géophysique, ULg, Allée du 6 Août 17, B5C, 4000 Sart Tilman (Liège), Belgium
2
European Southern Observatory, Alonso de Cordova 3107, Santiago 19, Chile
3
Royal Observatory of Belgium, Avenue Circulaire 3, 1180 Bruxelles, Belgium
4
Astronomical Observatory of Shevchenko University, 3 Observatorna st., Kyiv UA-04053, Ukraine
Corresponding author: D. Sluse, sluse@astro.ulg.ac.be
Received:
16
April
2003
Accepted:
14
June
2003
We report the discovery of a new quadruply imaged quasar
surrounded by an optical Einstein ring candidate. Spectra of the
different components of 1RXS J113155.4-123155 reveal a source at . Up to now, this object is the closest known
gravitationally lensed quasar. The lensing galaxy is clearly
detected. Its redshift is measured to be
. Additionally, the
total V magnitude of the system has varied by 0.3 mag between two epochs separated by 33 weeks. The measured relative astrometry of the
lensed images is best fitted with an SIS model plus shear. This
modeling suggests very high magnification of the source (up to 50 for
the total magnification) and predicts flux ratios between the lensed
images significantly different from what is actually observed. This
suggests that the lensed images may be affected by a combination of
micro or milli-lensing and dust extinction
effects.
Key words: gravitational lens / quasar / cosmology
© ESO, 2003
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