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.
Referencia bibliográfica

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

Fecha de publicación:
12
2011
Número de autores
5
Número de autores del IAC
1
Número de citas
36
Número de citas referidas
33
Descripción
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.
Proyectos relacionados
Imagen del Proyecto
Astrofísica Relativista y Teórica
El estudio de las lentes gravitatorias proporciona poderosas herramientas en Astrofísica y Cosmología. Las principales aplicaciones de las lentes gravitatorias en las que se centra este proyecto son las siguientes: (i) estudiar la presencia de subestructura de materia obscura en las galaxias lente a partir de las anomalías en la magnificación de
Evencio
Mediavilla Gradolph