Article (Scientific journals)
A quadruply imaged quasar with an optical Einstein ring candidate: 1RXS J113155.4-123155
Sluse, Dominique; Surdej, Jean; Claeskens, Jean-François et al.
2003In Astronomy and Astrophysics, 406 (Letters), p. 43-46
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Keywords :
gravitational lens; quasar; cosmology
Abstract :
[en] 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 z= 0.658. Up to now, this object is the closest known gravitationally lensed quasar. The lensing galaxy is clearly detected. Its redshift is measured to be z= 0.295. 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. Based on data collected at the European Southern Observatory, La Silla, Chile.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Sluse, Dominique  ;  Université de Liège - ULiège > Institut d'Astrophysique et de Géophysique ; European Southern Observatory, Alonso de Cordova 3107, Santiago 19, Chile
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Claeskens, Jean-François ;  Université de Liège - ULiège > Institut d'Astrophysique et de Géophysique
Hutsemekers, Damien ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Jean, C.
Courbin, F.;  Université de Liège - ULiège > Institut d'Astrophysique et de Géophysique
Nakos, T.;  Université de Liège - ULiège > Institut d'Astrophysique et de Géophysique ; European Southern Observatory, Alonso de Cordova 3107, Santiago 19, Chile ; Royal Observatory of Belgium, Avenue Circulaire 3, 1180 Bruxelles, Belgium
Billeres, M.;  European Southern Observatory, Alonso de Cordova 3107, Santiago 19, Chile
Khmil, S. V.;  Astronomical Observatory of Shevchenko University, 3 Observatorna st., Kyiv UA-04053, Ukraine
Language :
English
Title :
A quadruply imaged quasar with an optical Einstein ring candidate: 1RXS J113155.4-123155
Publication date :
01 July 2003
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
406
Issue :
Letters
Pages :
43-46
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 17 August 2009

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