X-ray observations and mass determinations in the cluster of galaxies C10024+17

G. Soucail, N. Ota, H. Böhringer, O. Czoske, M. Hattori, Y. Mellier

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18 Citations (Scopus)


We present a detailed analysis of the mass distribution in the rich and distant cluster of galaxies C10024+17. X-ray data come from both a deep ROSAT HRI image of the field (Böhringer et al. 2000) and ASCA spectral data. Using a wide field CCD image of the cluster, we optically identify all the faint X-ray sources, whose counts are compatible with deep X-ray number counts. In addition we marginally detect the X-ray counter-part of the gravitational shear perturbation detected by Bonnet et al. (1994) at a 2.5 σ level. A careful spectral analysis of ASCA data is also presented. In particular, we extract a low resolution spectrum of the cluster free from the contamination by a nearby point source located 1.2 arcmin from the center. The X-ray temperature deduced from this analysis is TX = 5.7-2.1+4.9 keV at the 90% confidence level. The comparison between the mass derived from a standard X-ray analysis and from other methods such as the Virial Theorem or the gravitational lensing effect lead to a mass discrepancy of a factor 1.5 to 3. We discuss all the possible sources of uncertainties in each method of mass determination and give some indications on the way to reduce them. A complementary study of optical data is in progress and may solve the X-ray/optical discrepancy through a better understanding of the dynamics of the cluster.

Original languageEnglish
Pages (from-to)433-442
Number of pages10
JournalAstronomy and Astrophysics
Issue number2
Publication statusPublished - 2000


  • Cosmology: dark matter-
  • Cosmology: gravitational lensing
  • Cosmology: observations -
  • Galaxies: clusters: general
  • Galaxies: clusters: individual: C10024+17
  • X-rays: galaxies


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