A Study of Gravitational Lens Chromaticity with the Hubble Space Telescope

Muñoz, J. A.; Mediavilla, E.; Kochanek, C. S.; Falco, E. E.; Mosquera, A. M.
Bibliographical reference

The Astrophysical Journal, Volume 742, Issue 2, article id. 67 (2011).

Advertised on:
12
2011
Number of authors
5
IAC number of authors
1
Citations
36
Refereed citations
33
Description
We report Hubble Space Telescope observations of six gravitational lenses with the Advanced Camera for Surveys. We measured the flux ratios between the lensed images in seven filters from 8140 Å to 2200 Å. In three of the systems, HE0512-3329, B1600+434, and H1413+117, we were able to construct UV extinction curves partially overlapping the 2175 Å feature and characterize the properties of the dust relative to the Galaxy and the Magellanic Clouds. In HE1104-1804, we detect chromatic microlensing and use it to study the physical properties of the quasar accretion disk. For a Gaussian model of the disk exp (- r 2/2r 2 s ), scaling with wavelength as rs vpropλ p , we estimate rs (λ3363) = 4+4 - 2 (7 ± 4) light days and p = 1.1 ± 0.6 (1.0 ± 0.6) for a logarithmic (linear) prior on rs . The remaining two systems, FBQ0951+2635 and SBS1520+530, yielded no useful estimates of extinction or chromatic microlensing. Based on observations made with the NASA/ESA Hubble Space Telescope. The Space Telescope Science Institute is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.
Related projects
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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
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Mediavilla Gradolph