SIMBAD references

2007A&A...474L..37A - Astronomy and Astrophysics, volume 474, L37-40 (2007/11-2)

Calibration of the galaxy cluster M500-YX relation with XMM-Newton.


Abstract (from CDS):

The quantity YX, the product of the X-ray temperature TX and gas mass Mg, 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 YX range of 1013-1015MkeV, we investigate the M500-YX relation. The M500-YX data exhibit a power law relation with slope α=0.548±0.027, close to the self-similar value (3/5) and independent of the mass range considered. However, the normalisation is ∼20% below the prediction from numerical simulations including cooling and galaxy feedback. We discuss two effects that could contribute to the normalisation offset: an underestimate of the true mass due to the hydrostatic equilibrium assumption used in X-ray mass estimates, and an underestimate of the hot gas mass fraction in the simulations. A comparison of the functional form and scatter of the relations between various observables and the mass suggest that YX may indeed be a better mass proxy than TX or Mg,500.

Abstract Copyright:

Journal keyword(s): cosmology: observations - cosmology: dark matter - galaxies: clusters: general - galaxies: intergalactic medium - X-rays: galaxies: clusters

Simbad objects: 11

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