L.V.E. Koopmans + the CLASS collaboration, PASA, 18 (2), in press.
Next Section: The Hubble Constant from
The Hubble Constant from (CLASS) Gravitational Lenses
L.V.E. Koopmansa + the CLASS collaboration
aCaltech, mailcode 130-33, Pasadena CA 91125, USA
leon@tapir.caltech.edu
Abstract:
One of the main objectives of the Cosmic Lens All-Sky Survey (CLASS) collaboration has been to find gravitational lens (GL) systems at radio wavelengths that are suitable for the determination of time delays between image pairs. The survey is now near completion and at least 18 GL systems have been found. Here, I will discuss our efforts to measure time delays from several of these systems with the ultimate aim of constraining the Hubble Constant (H0). Thus far three CLASS GL systems (i.e. B0218+357, B1600+434 and B1608+656) have yielded measurements of time delays, from which values of H060-70 kms-1Mpc-1 have been estimated. Although most GL systems give similar values of H0, statistical and systematic uncertainties are still considerable. To reduce these uncertainties, I will shortly mention two monitoring programs that we are undertaking to (re)measure time delays in 14 CLASS GL systems and address several important issues for the near future.
Keywords: Cosmology: cosmological parameters -- gravitational lensing
- The Hubble Constant from Gravitational Lensing
- Time Delays from CLASS Gravitational Lenses
- Estimates of the Hubble Constant
- The Future of H0 from Gravitational Lensing
- Acknowledgements
- References
- PostScript (gzipped, 32.2 kilobytes)
- No PDF file available
© Copyright Astronomical Society of Australia 1997
ASKAP
Public