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Gravitational shear, flexion and strong lensing in Abell 1689
Please use this identifier to cite or link to this item:
http://hdl.handle.net/1860/1920
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| Title: | Gravitational shear, flexion and strong lensing in Abell 1689 |
| Authors: | Leonard, Adrienne
Goldberg, David
Haaga, Jason
Massey, Richard |
| Keywords: | Cosmology: Observations
Galaxies: Clusters: General
Galaxies: Photometry
Gravitational lensing |
| Issue Date: | 7-Jun-2007 |
| Publisher: | American Astronomical Society |
| Citation: | The Astrophysical Journal, 666(1): pp. 51-63. |
| Abstract: | We present a gravitational lensing analysis of the galaxy cluster Abell 1689, incorporating measurements of the weak shear, exion, and strong lensing induced in background galaxies. This is the first
time that a shapelet technique has been used to reconstruct the distribution of mass in this cluster,
and the first time that a exion signal has been measured using cluster members as lenses. From weak
shear measurements alone, we generate a non-parametric mass reconstruction, which shows signifcant
substructure corresponding to groups of galaxies within the cluster. Additionally, our galaxy-galaxy
exion signal demonstrates that the cluster galaxies can be well-t by a singular isothermal sphere
model with a characteristic velocity dispersion of Ov = 295 +/- 40 km=s. We identify a major, distinct
dark matter clump, offset by 40h-1kpc from the central cluster members, which was not apparent from
shear measurements alone. This secondary clump is present in a parametric mass reconstruction using
exion data alone, and its existence is suggested in a non-parametric reconstruction of the cluster using
a combination of strong and weak lensing. As found in previous studies, the mass profile obtained by
combining weak and strong lensing data shows a much steeper profile than that obtained from only weak
lensing data. |
| URI: | http://arxiv.org/abs/astro-ph/0702242
http://hdl.handle.net/1860/1920 |
| Appears in Collections: | Faculty Research and Publications (Physics)
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