Constraining the Temperature Distributions and ICM Velocities in Galaxy Clusters

Details Constraining the Temperature Distributions and ICM Velocities in Galaxy Clusters Constraining the Temperature Distributions and ICM Velocities in Galaxy Clusters

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.3409f&link_type=abstract

American Astronomical Society, HEAD meeting #11, #34.09; Bulletin of the American Astronomical Society, Vol. 41, p.712

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Scientific paper

We use the Smoothed Particle Inference (SPI) method to measure a new parameter for galaxy clusters, the width of the temperature distribution, in addition to measuring median temperature and emission measure. Traditional analyses are unable to measure the temperature width because these methods assume a particular temperature distribution (often isothermal). We avoid such assumptions by modeling the ICM as a collection of X-ray emitting smoothed particles of plasma, each with its own independent set of parameters, including temperature, emission measure, abundance, size, and position. We have used this method on three low temperature clusters, HCG62, Abell 3581, and Abell 262. By including the redshift as one of the particle parameters, we are also able to use this method to put constraints on ICM velocities in the core of Abell 1835.

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