Study of the intracluster and intergalactic medium in the Sculptor supercluster with Suzaku

Kosuke Sato, Richard L. Kelley, Yoh Takei, Takayuki Tamura, Noriko Y. Yamasaki, Takaya Ohashi, Anjali Gupta, Massimiliano Galeazzi

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

We studied the high-temperature plasma in the direction of the Sculptor supercluster at z = 0.108 with Suzaku. Suzaku carried out four observations in the supercluster: namely, A 2811, A 2811 offset, A 2804, A 2801 regions in 2005 November-December, including the regions beyond the virial radii of these clusters. The spectra taken in regions outside of the virial radii of the member clusters were used as background that included both of the Galactic and Cosmic X-ray Background (CXB) components. Temperature and metal abundance profiles were determined to the virial radii of the member clusters, and we then searched for oxygen line emission in the region outside of the virial radii of the clusters. As a result, the temperature of the clusters decreased toward the virial radii, and the spectral fits for the filament region did not require any extra component other than the Galactic and CXB components. We constrained the intensities of the O VII and O VIII lines to be less than 8.1 and 5.1 × 10-8 photons cm-2 s-1 arcmin-2, respectively, as 2 σ upper limits in the filament region. The intensity of O VII indicates nH < 1.6 × 10-5 cm-3 (Z=0.1Z⊙)-1/2(L=25 Mpc)-1/2, which corresponds to an over density of δ < 60(Z=0.1Z⊙)-1/2(L/25 Mpc) -1/2.

Original languageEnglish (US)
Pages (from-to)1423-1433
Number of pages11
JournalPublications of the Astronomical Society of Japan
Volume62
Issue number6
DOIs
StatePublished - Dec 25 2010

Keywords

  • Galaxies: Clusters: Individual (A 2801, A 2804, and A 2811)
  • Intergalactic medium
  • X-rays: Diffuse background

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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