[en] The gravitational lens phenomenon is briefly introduced. When several images of the same variable quasar are observed, a determination of the time delay, i.e. the difference in light travel time between these different images can lead to a determination of distances between the source, the lens and the observer and, thus, of the Hubble constant. These determinations are compared to the more classical ones based on standard candles (Cepheids and Type Ia Supernovae).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Magain, Pierre ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Language :
English
Title :
Time Delay in Gravitational Lenses: an Alternative Route to the Hubble Constant
Publication date :
01 July 2005
Event name :
The Light-Time Effect in Astrophysics: Causes and cures of the O-C diagram
Event place :
Brussels, Belgium
Event date :
du 19 jui!let 2004 au 22 juillet 2004
By request :
Yes
Audience :
International
Main work title :
The Light-Time Effect in Astrophysics: Causes and cures of the O-C diagram
Editor :
Sterken, C.
Publisher :
Astronomical Society of the Pacific, San Francisco, United States - California
