H_0 from gravitational lenses: recent results
| dc.creator | Schechter, Paul L. | |
| dc.date | 2000-09-04 | |
| dc.date.accessioned | 2026-07-25T17:52:27Z | |
| dc.description | The 0th, 1st and 2nd derivatives of a ``Fermat potential'' give the three D's of gravitational lensing: delay, deflection and distortion. Observations of these delays, deflections and distortions for doubly and quadruply imaged quasars give estimates of Hubble's constant, H_0. The single largest contribution to the uncertainty in H_0 arises from the difficulty in constraining the degree of central concentration of the lensing potential. Fortunately, astronomers have spent a good deal of effort over the past quarter century addressing just this question. If galaxies at z=0.5 are like nearby galaxies, the associated systematic uncertainty in H_0 is less than 10%. The expected lens-to-lens scatter is 20%. Results from three particularly well constrained systems are reported. | |
| dc.description | 10 pages, no figures, uses newpasp.sty, invited review to be published in IAU Symposium No. 201: New Cosmological and the Values of the Fundamental Parameters, eds. A.N. Lasenby and A. Wilkinson | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0009048 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0009048 | |
| dc.identifier.uri | https://dspace.dare.co.zw/handle/123456789/51449 | |
| dc.subject | Astrophysics | |
| dc.title | H_0 from gravitational lenses: recent results | |
| dc.type | text |