Hostname: page-component-848d4c4894-pjpqr Total loading time: 0 Render date: 2024-06-19T15:31:03.854Z Has data issue: false hasContentIssue false
  • English
  • Français

The Hubble Constant from (CLASS) Gravitational Lenses

Published online by Cambridge University Press:  05 March 2013

L. V. E. Koopmans  and
The CLASS Collaboration
L. V. E. Koopmans
Affiliation:
Caltech, mailcode 130-33, Pasadena CA 91125, USA; leon@tapir.caltech.edu
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 (B0218+357, B1600+434 and B1608+656) have yielded measurements of time delays, from which values of H0 ≈ 60–70 km s−1 Mpc−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 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

cosmological parametersgravitationallensing
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 18 , Issue 2 , 2001 , pp. 179 - 181
Copyright
Copyright © Astronomical Society of Australia 2001

References

Biggs, A. D., Browne, I. W. A., Helbig, P., Koopmans, L. V. E., Wilkinson, P. N., & Perley, R. A. 1999, MNRAS, 304, 349 CrossRefGoogle Scholar
Biggs, A. D., Xanthopoulos, E., Browne, I. W. A., Koopmans, L. V. E., & Fassnacht, C. D. 2000, MNRAS, 318, 73 CrossRefGoogle Scholar
Browne, I. W. A., & Myers, S. T. 2000, IAU Symposium, 201, E47 Google Scholar
Burud, I., et al. 2000, ApJ, 544, 117 CrossRefGoogle Scholar
Cohen, A. S., Hewitt, J. N., Moore, C. B., & Haarsma, D. B. 2001, ApJ, in press, astro-ph/0010049Google Scholar
Cohn, J. D., Kochanek, C. S., McLeod, B. A., & Keeton, C. R. 2000, submitted, astro-ph/0008390Google Scholar
Corbett, E. A., Browne, I. W. A., & Wilkinson, P. N. 1996, IAU Symp. 173: Astrophysical Applications of Gravitational Lensing, 173, 37 Google Scholar
Fassnacht, C. D., Pearson, T. J., Readhead, A. C. S., Browne, I. W. A., Koopmans, L. V. E., Myers, S. T., & Wilkinson, P. N. 1999, ApJ, 527, 498 CrossRefGoogle Scholar
Fassnacht, C. D., Xanthopoulos, E., Koopmans, L. V. E., Pearson, T. J., Readhead, A. C. S., & Myers, S. T. 2001, in Gravitational Lensing: Recent Progress and Future Goals, ed. T. G. Brainerd, & C. S. Kochanek, astro-ph/9909410Google Scholar
Freedman, W. L., et al. 2001, ApJ, in press, astro-ph/0012376Google Scholar
Jackson, N., et al. 1995, MNRAS, 274, L25 CrossRefGoogle Scholar
Jackson, N., Helbig, P., Browne, I., Fassnacht, C. D., Koopmans, L., Marlow, D., & Wilkinson, P. N. 1998, A&A, 334, L33 Google Scholar
Jaunsen, A. O., & Hjorth, J. 1997, A&A, 317, L39 Google Scholar
Koopmans, L. V. E., de Bruyn, A. G., & Jackson, N. 1998, MNRAS, 295, 534 CrossRefGoogle Scholar
Koopmans, L. V. E., & Fassnacht, C. D. 1999, ApJ, 527, 513 CrossRefGoogle Scholar
Koopmans, L. V. E., de Bruyn, A. G., Xanthopoulos, E., & Fassnacht, C. D. 2000, A&A, 356, 391 Google Scholar
Kundic, T., et al. 1997, ApJ, 482, 75 CrossRefGoogle Scholar
Lehár, J., et al. 2000, ApJ, 536, 584 CrossRefGoogle Scholar
Maller, A. H., Simard, L., Guhathakurta, P., Hjorth, J., Jaunsen, A. O., Flores, R. A., & Primack, J. R. 2000, ApJ, 533, 194 CrossRefGoogle Scholar
Myers, S. T., et al. 1995, ApJL, 447, L5 CrossRefGoogle Scholar
Nair, S. 1998, MNRAS, 301, 315 CrossRefGoogle Scholar
Patnaik, A. R., Browne, I. W. A., King, L. J., Muxlow, T. W. B., Walsh, D., & Wilkinson, P. N. 1993, MNRAS, 261, 435 CrossRefGoogle Scholar
Refsdal, S. 1964, MNRAS, 128, 307 CrossRefGoogle Scholar
Schechter, P. 2000, astro-ph/0009048, to be published in IAU Symposium No. 201: New Cosmological and the Values of the Fundamental Parameters, ed. A. N. Lasenby & A. WilkinsonGoogle Scholar
Sykes, C. M., et al. 1998, MNRAS, 301, 310 CrossRefGoogle Scholar
Walsh, D., Carswell, R. F., & Weymann, R. J. 1979, Nature, 279, 381 CrossRefGoogle Scholar