Bibcode
Jiménez-Vicente, J.; Mediavilla, E.; Kochanek, C. S.; Muñoz, J. A.
Bibliographical reference
The Astrophysical Journal, Volume 799, Issue 2, article id. 149, 6 pp. (2015).
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2
2015
Journal
Citations
53
Refereed citations
49
Description
We present a joint estimate of the stellar/dark matter mass fraction in
lens galaxies and the average size of the accretion disk of lensed
quasars based on microlensing measurements of 27 quasar image pairs seen
through 19 lens galaxies. The Bayesian estimate for the fraction of the
surface mass density in the form of stars is α = 0.21 ±
0.14 near the Einstein radius of the lenses (~1-2 effective radii). The
estimate for the average accretion disk size is
R1/2=7.9+3.8-2.6\sqrt{M/0.3 M_ȯ }
light days. The fraction of mass in stars at these radii is
significantly larger than previous estimates from microlensing studies
assuming quasars were point-like. The corresponding local dark matter
fraction of 79% is in good agreement with other estimates based on
strong lensing or kinematics. The size of the accretion disk inferred in
the present study is slightly larger than previous estimates.
Related projects
Relativistic and Theoretical Astrophysics
Introduction Gravitational lenses are a powerful tool for Astrophysics and Cosmology. The goals of this project are: i) to obtain a robust determination of the Hubble constant from the time delay measured between the images of a lensed quasar; ii) to study the individual and statistical properties of dark matter condensations in lens galaxies from
Evencio
Mediavilla Gradolph