Evidence for Non-Hydrostatic Gas from the Cluster X-ray to Lensing Mass Ratio

Details Evidence for Non-Hydrostatic Gas from the Cluster X-ray to Lensing Mass Ratio Evidence for Non-Hydrostatic Gas from the Cluster X-ray to Lensing Mass Ratio

2007-10-23

arxiv.org/abs/0710.4132v2

Astronomy and Astrophysics

Astrophysics

8 pages, minor modifications, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2007.12796.x

Using a uniform analysis procedure, we measure spatially resolved weak gravitational lensing and hydrostatic X-ray masses for a sample of 18 clusters of galaxies. We find a radial trend in the X-ray to lensing mass ratio: at r2500 we obtain a ratio MX/ML=1.03+/-0.07 which decreases to MX/ML=0.78+/-0.09 at r500. This difference is significant at 3 sigma once we account for correlations between the measurements. We show that correcting the lensing mass for excess correlated structure outside the virial radius slightly reduces, but does not eliminate this trend. An X-ray mass underestimate, perhaps due to nonthermal pressure support, can explain the residual trend. The trend is not correlated with the presence or absence of a cool core. We also examine the cluster gas fraction and find no correlation with ML, an important result for techniques that aim to determine cosmological parameters using the gas fraction.

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