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H0 from Gravitational Lenses: Recent Results

Published online by Cambridge University Press:  26 May 2016

Paul L. Schechter
Paul L. Schechter*
Affiliation:
Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139-4307, USA

Abstract

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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, H0. The single largest contribution to the uncertainty in H0 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 H0 is less than 10%. The expected lens-to-lens scatter is 20%. Results from three particularly well constrained systems are reported.

Type
Part VI: Determination of H0
Information
Symposium - International Astronomical Union , Volume 201: New Cosmological Data and the Values of the Fundamental Parameters , 2005 , pp. 209 - 218
Copyright
Copyright © Astronomical Society of the Pacific 2005 

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