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The dark matter content of lensing galaxies at 1.5 Re

Published online by Cambridge University Press:  26 May 2016

Paul L. Schechter  and
Joachim Wambsganss
Paul L. Schechter
Affiliation:
Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge MA 02139, USA
Joachim Wambsganss
Affiliation:
Universität Potsdam, Institut für Physik, Am Neuen Palais 10, 14469 Potsdam, Germany

Abstract

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Many quasars that are gravitationally lensed exhibit flux ratio “anomalies” that cannot be explained under the hypothesis that the lensing potential is smooth on scales smaller than 1 kpc. Micro-lensing by stars is a natural source of granularity in the lens potential. the character of the expected fluctuations due to Micro-lensing depends sensitively on the relative surface densities of micro-lenses (stars) and smoothly distributed (dark) matter. Observations of flux ratios may therefore be used to infer the ratio of stellar to dark matter along the line of sight – typically at impact parameters 1.5 times the half light radius. Several recently discovered systems have anomalies that would seem to be explained by Micro-lensing only by demanding that 70-90% of the matter along the line of sight be smoothly distributed.

Type
Part 4: Lensing
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 103 - 108
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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