1998 • In Müller, Volker; Gottlöber, , Stefan; Mücket, Jan Peteret al. (Eds.) Large Scale Structure: Tracks and Traces : Proceedings of the 12th Potsdam Cosmology Workshop : Potsdam, Germany, 15-19 September 1997
[en] Recently, it was noted by Park \& Gott (1997) that there is a statistically significant, strong, negative correlation between the image separation $\Delta\theta$ and source redshift $z_{\mathrm{s}}$ for gravitational lenses. This is somewhat puzzling if one believes in a flat ($k=0$) universe, since in this case the typical image separation is expected to be independent of the source redshift, while one expects a negative correlation in a $k=-1$ universe and a positive one in a $k=+1$ universe. Park \& Gott explored several effects which could cause the observed correlation, but no combination of these can explain the observations with a realistic scenario. Here, I explore this test further in three ways. First, I show that in an inhomogeneous universe a negative correlation is expected regardless of the value of $k$. Second, I test whether the $\Delta\theta$-$z_{\mathrm{s}}$ relation can be used as a test to determine $\lambda_{0}$ and $\Omega_{0}$, rather than just the sign of $k$. Third, I compare the results of the test from the Park \& Gott sample to those using other samples of gravitational lenses, which can illuminate (unknown) selection effects and probe the usefulness of the $\Delta\theta$-$z_{\mathrm{s}}$ relation as a cosmological test.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Helbig, Phillip ; NRAL Jodrell Bank, Macclesfield, Cheshire SK11 9DL England
Language :
English
Title :
The Delta theta-z$_{s}$ Relation as a Cosmological Test
Alternative titles :
[en] The image separation source redshift relation for gravitational lenses
Publication date :
August 1998
Event name :
Large Scale Structure: Tracks and Traces: 12th Potsdam Cosmology Workshop : Potsdam, Germany, 15-19 September 1997
Event organizer :
AIP Potsdam
Event place :
Potsdam, Germany
Event date :
from 15-09-1997 to 19-09-1997
Audience :
International
Main work title :
Large Scale Structure: Tracks and Traces : Proceedings of the 12th Potsdam Cosmology Workshop : Potsdam, Germany, 15-19 September 1997
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