Are Low-Mass Galaxy Clusters Overconcentrated?

Details Are Low-Mass Galaxy Clusters Overconcentrated? Are Low-Mass Galaxy Clusters Overconcentrated?

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933805w&link_type=abstract

American Astronomical Society, AAS Meeting #219, #338.05

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Scientific paper

The Sloan Bright Arcs Survey (SBAS) at Fermilab has discovered and confirmed 19 strong-lensing systems in the Sloan Digital Sky Survey. We used the WIYN telescope to take follow-up data on 10 of these systems, studying both the properties of the galaxy clusters and the properties of the strong gravitational lenses. We have found that the majority of our systems are lower-mass clusters, those with mass ≤ 1014 M&sun;. Using this data we have found evidence to support other groups' findings of an overconcentration problem among galaxy clusters, the idea that galaxy clusters are more concentrated than ΛCDM would predict. It has recently been suggested that the overconcentration problem is most significant among low-mass clusters. We present our results for the relation between Einstein radius of the strong lenses and cluster mass (M200). We show that the Einstein radii of the clusters are typically larger than would be expected based on current models, indicating that the clusters are overconcentrated.

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