科研之友
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摘要
Aims. We present a search for gravitational arcs in a unique sample of X-ray luminous, medium redshift clusters of galaxies.
Methods. The sample of clusters is called ARCRAIDER, is based on the ROSAT Bright Survey (RBS) and fulfils the following criteria: (a) X-ray luminosity >= 0.5 x 10(45) erg/ s (0.5-2 keV band), (b) redshift range 0.1 <= z <= 0.52, (c) classified as clusters in the ;RBS, (d) not a member of the Abell catalogue and, finally, (e) visible from the ESO sites La Silla/Paranal (declination delta <= 20 degrees).
Results. In total we found more than 35 (giant) arc/arclet candidates, including a possible radial arc, one galaxy-galaxy lensing event and a possible quasar triple image in 14 of the 21 clusters of galaxies. Hence 66% of the sample members are possible lenses.
- 出版日期2010-4
