Astronomy and Astrophysics, volume 440, 453-471 (2005/9-3)
Weak lensing study of dark matter filaments and application to the binary cluster A 222 and A 223.
DIETRICH J.P., SCHNEIDER P., CLOWE D., ROMANO-DIAZ E. and KERP J.
Abstract (from CDS):
We present a weak lensing analysis of the double cluster system Abell 222 and Abell 223. The lensing reconstruction shows evidence for a possible dark matter filament connecting both clusters. The case for a filamentary connection between A 222/223 is supported by an analysis of the galaxy density and X-ray emission between the clusters. Using the results of N-body simulations, we try to develop a criterion that separates this system into cluster and filament regions. The aim is to find a technique that allows the quantification of the significance of (weak lensing) filament candidates in close pairs of clusters. While this mostly fails, the aperture quadrupole statistics (Schneider & Bartelmann, 1997MNRAS.286..696S
) shows some promise in this area. The cluster masses determined from weak lensing in this system are considerably lower than those previously determined from spectroscopic and X-ray observations (Dietrich et al., 2002A&A...394..395D
; Proust et al., 2000A&A...355..443P
; David et al., 1999ApJ...519..533D
). Additionally, we report the serendipitous weak lensing detection of a previously unknown cluster in the field of this double cluster system.
gravitational lensing - galaxies: clusters: general - galaxies: clusters: individual: A 222 - cosmology: large-scale structure of Universe
Text: [DSC2005] A223-W (Nos S, N). Text: [DSC2005] SE peak N=1. Table A1: [DSC2005] arclet N (Nos 1-2).
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