Reference : Redshifts and lens profile for the double quasar QJ 0158-4325
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/34475
Redshifts and lens profile for the double quasar QJ 0158-4325
English
Faure, C. [> > > >]
Anguita, T. [> > > >]
Eigenbrod, A. [> > > >]
Kneib, J. P. [> > > >]
Chantry, Virginie [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Alloin, D. [> > > >]
Morgan, N. [> > > >]
Covone, G. [> > > >]
Mar-2009
Astronomy and Astrophysics
EDP Sciences
496
2
361-364
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] Aims. We report on the redshift of the lensing galaxy and of the quasar QJ 0158-4325 and on the lens model of the system. Methods. A deep VLT/FORS2 spectrum and HST/NICMOS-F160W images are deconvolved. From the images we derive the light profile of the lensing galaxy and an accurate relative astrometry for the system. In addition we measure the flux ratio between the quasar images in the Mg II emission line to constrain the mass model. Results. From the spectrum we measure the redshift of the lensing galaxy (z = 0.317 +/- 0.001) and of the quasar (z = 1.294 +/- 0.008). Using the flux ratio in the lens model allows us to discard the SIE as a suitable approximation of the lens potential. On the contrary the truncated-PIEMD gives a good fit to the lens and leads to a time delay of Delta t(A-B) = -14.5 +/- 0.1 days, with H-0 = 73 km s(-1) Mpc(-1). Conclusions. Using the flux ratio to constrain the mass model favors the truncated-PIEMD over the SIE, while ignoring this constraint leaves the choice open.
http://hdl.handle.net/2268/34475
10.1051/0004-6361:200810277
The authors thank EDP Sciences and A&A for their deposit authorization

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