Article (Scientific journals)
HST and ground-based observations of the gravitational lens system Q1009-0252 A & B
Claeskens, Jean-François; Khmil, S. V.; Lee, Dong Wook et al.
2001In Astronomy and Astrophysics, 367, p. 748-758
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Keywords :
GRAVITATIONAL LENSING; QUASARS: INDIVIDUAL: Q1009-0252 A & B; QUASARS: GENERAL
Abstract :
[en] In this paper, we propose a critical study of direct images and spectra obtained for the doubly imaged QSO Q1009-0252 A & B (=LBQS1009-0252 A & B). First, we report new observations with the WFPC2 onboard the Hubble Space Telescope (HST), in which the lensing galaxy is very clearly detected. We combine these with existing NICMOS observations in order to characterize the nature and redshift of the lens. Our HST observations are also fitted with simple analytical lens models; estimates expected for the time delay and M/L of the lensing galaxy are derived. Secondly, new and existing ground-based observations are used in order to establish the first multicolour lightcurves of the lensed components. Although the time resolution is low, flux variability is detected for both components. Finally, ground-based spectroscopic observations published by Surdej et al. (1993) are re-processed with a new method designed to extract spectra with small angular separations. The final spectra are analysed on the basis of a simple model including macrolensing and microlensing amplifications and dust extinction. Based on observations collected at the European Southern Observatory (La Silla, Chile) and with the Hubble Space Telescope.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Claeskens, Jean-François ;  Institut d'Astrophysique et de Géophysique, Université de Liège, Avenue de Cointe 5, 4000 Liège, Belgium
Khmil, S. V.;  Institut d'Astrophysique et de Géophysique, Université de Liège, Avenue de Cointe 5, 4000 Liège, Belgium ; Astronomical Observatory of Kyiv University, Observatorna St. 3, UKR-04053 Kyiv, Ukraine
Lee, Dong Wook;  Institut d'Astrophysique et de Géophysique, Université de Liège, Avenue de Cointe 5, 4000 Liège, Belgium
Sluse, Dominique  ;  Institut d'Astrophysique et de Géophysique, Université de Liège, Avenue de Cointe 5, 4000 Liège, Belgium
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Language :
English
Title :
HST and ground-based observations of the gravitational lens system Q1009-0252 A & B
Publication date :
2001
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
367
Pages :
748-758
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 13 July 2009

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