| Mass-detection of a matter concentration projected near the cluster Abell 1942: Dark clump or highredshift cluster? (2007) | |||||||||||||
Abstract | |||||||||||||
| A weak-lensing analysis of a wide-field V -band image centered on the cluster Abell 1942 has uncovered the presence of a mass concentration projected 7 arcminutes South of the cluster center. From an additional wide-field image, taken with a different camera in the I-band, the presence of this mass concentration is confirmed. A statistical analysis, using the aperture mass technique, shows that the probability of finding such a mass concentration from a random alignment of background galaxies is 10 \Gamma6 and 4 \Theta 10 \Gamma4 for the V - and I-band image, respectively. No obvious strong concentration of bright galaxies is seen at the position of the mass concentration, but a slight galaxy number overdensity is present about 1 0 away from its center. Archival ROSAT-HRI data show the presence of a weak extended X-ray source near to the mass concentration, but also displaced by about 1 0 from its center, and very close to the center of the slight galaxy number concentration. ... | |||||||||||||
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