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Date and Time of the Query: 2019-04-22 T14:24:03 PDT
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For refcode 2018ApJ...863...37F:
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2018ApJ...863...37F A New Interpretation of the Mass-Temperature Relation and Mass Calibration of Galaxy Clusters Based on the Fundamental Plane Fujita, Yutaka; Umetsu, Keiichi; Ettori, Stefano; Rasia, Elena; Okabe, Nobuhiro; Meneghetti, Massimo Abstract. Observations and numerical simulations have shown that the relation between the mass scaled with the critical density of the universe and the X-ray temperature of galaxy clusters is approximately represented by {M}_{{Delta_}} is proportional to {T}_X_^3/2^ (e.g., {{Delta}}=500). This relation is often interpreted as evidence that clusters are in virial equilibrium. However, the recently discovered fundamental plane (FP) of clusters indicates that the temperature of clusters primarily depends on a combination of the characteristic mass M_ s_ and radius r_ s_ of the Navarro-Frenk-White profile rather than M_Delta_. Moreover, the angle of the FP revealed that clusters are not in virial equilibrium because of continuous mass accretion from the surrounding matter. By considering both the FP and the mass dependence of the cluster concentration parameter, we show that this paradox can be solved and the relation {M}_{{Delta_}} is proportional to {T}_X_^3/2^ actually reflects the central structure of clusters. We also find that the intrinsic scatter in the halo concentration-mass relation can largely account for the spread of clusters on the FP. We also show that X-ray data alone form the FP and the angle and the position are consistent with those of the FP constructed from gravitational lensing data. We demonstrate that a possible shift between the two FPs can be used to calibrate cluster masses obtained via X-ray observations. Key words: cosmology: theory, dark matter, galaxies: clusters: general, large-scale structure of universe
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