Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21922304p&link_type=abstract
American Astronomical Society, AAS Meeting #219, #223.04
Astronomy and Astrophysics
Astronomy
Scientific paper
We present results from ACRES (the Arizona Cluster REdshift Survey), our recently completed wide-field spectroscopic survey of 30 clusters at z 0.2 with Hectospec/MMT. With > 300 redshifts per cluster within 2-3 virial radii and a total of 10,000 cluster galaxy redshifts, we are able to probe the dynamics of the infall regions of a large sample of clusters for the first time. These clusters are selected from the LoCuSS sample, and have a wealth of auxiliary multi-wavelength data. We will introduce the survey and use the rich phase space information to quantify the amount of 3D substructure in our cluster sample, which we then directly compare to estimates of substructure from gravitational lensing and X-ray studies. We discuss the importance of projection effects and the consequent need for multi-wavelength data in order to properly constrain the recent accretion history of each cluster as well as the effect these merger events might have on the cluster galaxy population and ICM.
Egami Eiichi E.
Haines Christopher
Hardegree-Ullman Emily E.
Pereira Maria
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