A comparative study of local galaxy clusters - I. Derived X-ray observables

Eduardo Rozo, E. S. Rykoff, J. G. Bartlett, A. Evrard

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

We examine systematic differences in the derived X-ray properties of galaxy clusters as reported by three different groups: Vikhlinin et al., Mantz et al. and Plank Collaboration. The sample overlap between any two pairs of works ranges between 16 to 28 galaxy clusters. We find systematic differences in most reported X-ray properties, including the total cluster mass, M500. The most extreme case is an average 45 ± 5 per cent difference in cluster mass between the Plank Collaboration and Mantz et al., for clusters at z > 0.13 (averaged over 16 clusters). These differences also induce differences in cluster observables defined within an R500 aperture. After accounting for aperture differences, we find very good agreement in gas mass estimates between the different groups. However, the soft-band X-ray luminosity, LX, core-excised spectroscopic temperature, TX, and gas thermal energy, YX = MgasTX display mean differences at the 5-15 per cent level. We also find that the low (z ≤ 0.13) and high (z ≥ 0.13) redshift galaxy cluster samples in Plank Collaboration appear to be systematically different: the YSZ/YX ratio for each of these two sub-samples is ln (YSZ/YX) = -0.06 ± 0.04 and ln (YSZ/YX) = 0.08 ± 0.04, respectively.

Original languageEnglish (US)
Article numberstt2091
Pages (from-to)49-61
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume438
Issue number1
DOIs
StatePublished - Feb 2014
Externally publishedYes

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comparative study
galaxies
x rays
yttria-stabilized zirconia
gas
apertures
energy
temperature
thermal energy
gases
luminosity
estimates

Keywords

  • Galaxies: Clusters: General

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

A comparative study of local galaxy clusters - I. Derived X-ray observables. / Rozo, Eduardo; Rykoff, E. S.; Bartlett, J. G.; Evrard, A.

In: Monthly Notices of the Royal Astronomical Society, Vol. 438, No. 1, stt2091, 02.2014, p. 49-61.

Research output: Contribution to journalArticle

Rozo, Eduardo ; Rykoff, E. S. ; Bartlett, J. G. ; Evrard, A. / A comparative study of local galaxy clusters - I. Derived X-ray observables. In: Monthly Notices of the Royal Astronomical Society. 2014 ; Vol. 438, No. 1. pp. 49-61.
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