The Physical Origin of Intrinsic Scatter in the Cluster X-ray and SZ Scaling Relations

Details The Physical Origin of Intrinsic Scatter in the Cluster X-ray and SZ Scaling Relations The Physical Origin of Intrinsic Scatter in the Cluster X-ray and SZ Scaling Relations

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21710904y&link_type=abstract

American Astronomical Society, AAS Meeting #217, #109.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

Mathematics

Logic

Scientific paper

Clusters of galaxies are invaluable cosmological probes, but systematic biases and the form and evolution of scatter in the mass-observable relations need to be understood to obtain accurate mass estimates. We use N-body plus hydrodynamic simulations including different physical processes to study the impact of halo concentration, dynamical state, radiative cooling and AGN feedback on scatter in the X-ray temperature-mass and the SZ flux-mass (Y-M) scaling relations. We find that the variation in concentration is a significant source of scatter in both relations, which can be used to tighten the relations for better mass estimates. Contrary to intuition, the effect of dynamical state is statistically negligible. Due to the sensitivity of the SZ effect to cluster morphology and projection effect, we find that the Y-M scatter has positive skewness and kurtosis to a degree that can bias cosmological constraints assuming lognormality. Fortunately, because the errors in the SZ and X-ray relations are not correlated, cross-calibrations of cluster masses can be effective in identifying the outliers due to projection errors. The influence of additional gas physics in cluster cores such as radiative cooling and AGN feedback is also discussed.

Affiliated with

Also associated with

No associations

Rating

The Physical Origin of Intrinsic Scatter in the Cluster X-ray and SZ Scaling Relations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Physical Origin of Intrinsic Scatter in the Cluster X-ray and SZ Scaling Relations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Physical Origin of Intrinsic Scatter in the Cluster X-ray and SZ Scaling Relations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1393326