Issue |
A&A
Volume 379, Number 2, November IV 2001
|
|
---|---|---|
Page(s) | 384 - 392 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20011310 | |
Published online | 15 November 2001 |
Wide field weak lensing observations of A1689
1
Institut für Astrophysik und Extraterrestrische Forschung der Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
2
Max-Planck-Institut für Astrophysik, Karl Schwarzschild Str. 1, 85741 Garching, Germany
Corresponding author: D. Clowe, clowe@astro.uni-bonn.de
Received:
11
June
2001
Accepted:
10
September
2001
We present a mass profile for A1689 from from a weak lensing analysis of a
R-band image from the
ESO/MPG Wide Field Imager. We detect the gravitational shearing of a
background galaxy population even at the edge of the image with a
significance, and find a two-dimensional mass reconstruction has
a
significance mass peak centered on the brightest cluster
galaxy. This peak is well fit by both a
km s-1 singular isothermal
sphere and a
"universal" CDM profile, although
the "universal" CDM profile provides a better fit with 95.5% confidence.
These mass measurements are lower than most of those derived by other means
and we discuss possible reasons for weak lensing providing an underestimate
of the true mass of the cluster. We find that the correction factors needed
to reconcile the weak lensing mass models with the strong lensing Einstein
radius would result is a much larger fraction of faint stars and foreground
and cluster dwarf galaxies in the
object catalog than is seen in
other fields.
Key words: gravitational lensing / galaxies: clusters: individual: A1689 / dark matter
© ESO, 2001
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