[en] We describe a new project aiming at measuring time delays for most known lensed quasars, from optical light curves obtained with five (almost) dedicated 1-2 m telescopes in the Northern and Southern hemispheres. The goal is to evaluate the Hubble constant H[SUB]0[/SUB] with a precision below 2%. We present here numerical simulations in order to define the optimal temporal sampling in our observations as a function of typical quasar variations, object visibility, and for a given accuracy on the individual photometric points. It is also emphasized that the ongoing effort to obtain deep imaging using both space and ground based facilities must be continued, as illustrated by the comparison of HST and VLT near-IR images of the `cloverleaf': H 1413+117.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Courbin, F.
Eigenbrod, A.
Vuissoz, C.
Meylan, G.
Magain, Pierre ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Language :
English
Title :
COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses
Publication date :
01 June 2005
Event name :
Gravitational Lensing Impact on Cosmology, IAU Symposium 225
Event organizer :
International Astronomical Union
Event place :
Lausanne, Switzerland
Event date :
19 juillet 2004 au 23 juillet 2004
By request :
Yes
Audience :
International
Main work title :
Gravitational Lensing Impact on Cosmology
Editor :
Mellier, Y.
Meylan, G.
Publisher :
Cambridge University Press, Cambridge, United Kingdom
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