model+comparison

Model Comparison of X-ray Masses using models by Vikhlinin et al. (2006) and Bulbul et al. (2010)
We have analyzed 33 clusters using //Chandra// X-ray data and obtained mass measurements using the Vikhlinin et al. (2006) and Bulbul et al. (2010) (Poly) model. Below are plots showing the model comparison between the Vikhlinin model and the Poly model for rdelta, Mgas, Mtotal, and fgas. Cluster measurements were made at r2500 and r500 for a total of 33 clusters (two clusters remain and are still being analyzed). The Poly model is on the x-axis and the Vikhlinin model is on the y-axis (the red line is y=x). Note: The biggest discrepancy comes from A520, which is clearly not spherical (see the image at the bottom of the page).

r2500:



r500:



Mgas(r2500):



Mgas(r500):



Mtot(r2500):



Mtot(r500):



fgas(r2500):



fgas(r500):



The average value of fgas(r500) for the 33 clusters shown in the plots above is reported below.

Weighted Average: Poly fgas(r500): 0.137 +- 0.002 Vikh fgas(r500): 0.136 +- 0.003

Linear Average: Poly fgas(r500): 0.146 Vikh fgas(r500): 0.149

Chandra X-ray image of A520: