Query : 2001A&A...379..384C

2001A&A...379..384C - Astronomy and Astrophysics, volume 379, 384-392 (2001/11-4)

Wide field weak lensing observations of A1689.


Abstract (from CDS):

We present a mass profile for A1689 from 0.13h–1Mpc<r<2h–1Mpc from a weak lensing analysis of a 34'x34' R-band image from the ESO/MPG Wide Field Imager. We detect the gravitational shearing of a 23<R<25.5 background galaxy population even at the edge of the image with a 4σ significance, and find a two-dimensional mass reconstruction has a 13.4σ significance mass peak centered on the brightest cluster galaxy. This peak is well fit by both a 1028±35km/s singular isothermal sphere and a r200=1.28Mpc, c=6 ``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 23<R<25.5 object catalog than is seen in other fields.

Abstract Copyright:

Journal keyword(s): gravitational lensing - galaxies: clusters: individual: A1689 - dark matter

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 454 0
2 ClG 1137+66 ClG 11 40 23.0 +66 08 16     21.0     ~ 138 0
3 ACO 1689 ClG 13 11 29.5 -01 20 28           ~ 1109 0
4 ClG J1716+6708 ClG 17 16 49.6 +67 08 30           ~ 134 0
5 NAME HDF-S reg 22 32 56 -60 33.0           ~ 566 0

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