New Tests of the Cluster Entropy Floor Hypothesis

Details New Tests of the Cluster Entropy Floor Hypothesis New Tests of the Cluster Entropy Floor Hypothesis

2002-07-05

arxiv.org/abs/astro-ph/0207147v1

Astronomy and Astrophysics

Astrophysics

2 pages, 2 figures, to appear in `Galaxy Evolution: Theory and Observations', Eds. V. Avila-Reese, C. Firmani, C. Frenk, & C.

Scientific paper

Recent efforts to account for the observed X-ray luminosity - temperature relation of galaxy clusters has led to suggestions that the ICM has an apparent ``entropy floor'' at or above the level of 300 keV cm^2. Here, we propose new tests based on the thermal Sunyaev-Zeldovich effect and on the cluster gas mass - temperature trend (from X-ray data) to probe the level of excess entropy in the ICM. We show that these new tests lend further support to the case for a high entropy floor in massive clusters.

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