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Astronomy Reports

, Volume 58, Issue 9, pp 587–610 | Cite as

Chandra X-ray galaxy clusters at z < 1.4: Constraints on the inner slope of the density profiles

  • Yu. V. BabykEmail author
  • A. Del Popolo
  • I. B. Vavilova
Article
First Online:

Abstract

A reconstruction of the total mass (the fraction of dark matter, intercluster gas, and the brightest galaxy of the cluster) of 128 X-ray galaxy clusters at redshifts 0.01–1.4 based on Chandra observations is presented. The total mass M 200 and the baryonic mass M b have been measured for all the sample objects, as well as the concentration parameter c 200, which characterizes the size of the dark matter halo. The existence of a tight correlation between c 200 and M 200 is confirmed, c ∝ M vir a /(1 + z) b with a = −0.56 ± 0.15 and b = 0.80 ± 0.25 (95% confidence level), in good agreement with the predictions of numerical simulations and previous observations. Fitting the inner dark-matter density slope α with a generalized NFW model yields α = 1.10 ± 0.48 at the 2σ confidence level, combining the results for the entire sample, for which the model gives a good description of the data. There is also a tight correlation between the inner slope of the dark-matter density profile α and the baryonic mass contentM b for massive galaxy clusters, namely, α decreases with increasing baryonic mass content. A simple power-law model is used to fit the α − M b distributions, yielding the break point for the inner slope of the dark-matter density profile b = 1.72 ± 0.37 (68% confidence level).

Keywords

Dark Matter Astronomy Report Galaxy Cluster Dwarf Galaxy Stellar Mass 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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© Pleiades Publishing, Ltd. 2014

Authors and Affiliations

  • Yu. V. Babyk
    • 1
    Email author
  • A. Del Popolo
    • 2
    • 3
  • I. B. Vavilova
    • 1
  1. 1.Main Astronomical ObservatoryNational Academy of Sciences of UkraineKyivUkraine
  2. 2.Università di CataniaCataniaItaly
  3. 3.Universidade de São PauloSão PauloBrazil

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