Letter to the editor (Scientific journals)
High-Resolution Optical and Near-Infrared Imaging of the Quadruple Quasar RX J0911.4+0551
Burud, I.; Courbin, F.; Lidman, C. et al.
1998In Astrophysical Journal, 501, p. 5-L10
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Keywords :
GALAXIES: CLUSTERS: GENERAL; GALAXIES: QUASARS: INDIVIDUAL ALPHANUMERIC: RX J0911.4+0551; COSMOLOGY: GRAVITATIONAL LENSING
Abstract :
[en] We report the detection of four images in the recently discovered lensed QSO RX J0911.4+0551. With a maximum angular separation of 3."1, it is the quadruply imaged QSO with the widest known angular separation. Raw and deconvolved data reveal an elongated lens galaxy. The observed reddening in at least two of the four QSO images suggests differential extinction by this lensing galaxy. We show that both an ellipticity of the galaxy ( epsilon _{{min}}=0.075 ) and an external shear ( gamma _{{min}}=0.15 ) from a nearby mass have to be included in the lensing potential in order to reproduce the complex geometry observed in RX J0911.4+0551. A possible galaxy cluster is detected about 38" from RX J0911.4+0551 and could contribute to the X-ray emission observed by ROSAT in this field. The color of these galaxies indicates a plausible redshift in the range of 0.6-0.8.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Burud, I.
Courbin, F.
Lidman, C.
Jaunsen, A. O.
Hjorth, J.
Ostensen, R.
Andersen, M. I.
Clasen, J. W.
Wucknitz, O.
Meylan, G.
Magain, Pierre  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Stabell, R.
Refsdal, S.
More authors (3 more) Less
Language :
English
Title :
High-Resolution Optical and Near-Infrared Imaging of the Quadruple Quasar RX J0911.4+0551
Publication date :
01 July 1998
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
University of Chicago Press, Chicago, United States - Illinois
Volume :
501
Pages :
L5-L10
Peer reviewed :
Peer Reviewed verified by ORBi
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