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2007

Calibration of the galaxy cluster M_500-Y_X relation with XMM-Newton

Arnaud, M., Pointecouteau, E., Pratt, G. W.

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The quantity Y_ X, the product of the X-ray temperature T_ X and gas mass M_ g, has recently been proposed as a robust low-scatter mass indicator for galaxy clusters.

Using precise measurements from XMM-Newton data of a sample of 10 relaxed nearby clusters, spanning a Y_ X range of 10^13 -10^15 M_sun keV, we investigate the M_500-Y_ X relation.
The M_500 - Y_ X data exhibit a power law relation with slope alpha=0.548 \pm 0.027, close to the self-similar value (3/5) and independent of the mass range considered.
However, the normalisation is \sim 20% below the prediction from numerical simulations including cooling and galaxy feedback.

Calibration of the galaxy cluster M_500-Y_X relation with XMM-Newton · Around

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Then

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Nagai, D., Vikhlinin, A. & Kravtsov, A. 2007a, ApJ, 655, 98

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Nagai, D., Kravtsov, A. & Vikhlinin, A. 2007b, ApJ, submitted, astro-ph/0703661

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