Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714916k&link_type=abstract
American Astronomical Society, AAS Meeting #217, #149.16; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
As the largest virialised structures in the Universe, galaxy clusters are important tools for constraining cosmological models. In particular, cluster masses can be used to estimate the M/L of the Universe and from that the matter energy density, Omegam. The most frequently used methods for estimating cluster masses are limited in their applicability. We present here a method of cluster mass estimation that is relatively free from these limitations. Originally proposed by Diaferio and Geller (1997), this method uses the amplitude of the caustics formed by galaxies in redshift space to estimate the escape velocity of the cluster gravitational potential and therefore the cluster mass. We estimate the mass within 2Rvir of the rich cluster A370 (at z=0.3745) using this method. We thank the CTIO 2010 REU Program for supporting this work.
Harrison Craig
Kao Melodie
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