Spectral analysis of Rossi X-yay timing explorer observations of A3667

Yoel Rephaeli*, Duane Gruber

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


X-ray emission from the cluster of galaxies A3667 was measured by the Proportional Counter Array and High-Energy X-Ray Timing Experiment experiments on board the Rossi X-Ray Timing Explorer (RXTE) satellite during the period 2001 December-2002 July. Analysis of the ∼141 ks RXTE observation and lower energy ASCA Gas Imaging Spectrometer data yields only marginal evidence for a secondary power-law emission component in the spectrum. The 90% confidence upper limit on nonthermal emission in the 15-35 keV band is determined to be 2.6 × 10-12 ergs cm-2 s-1. When combined with the measured radio flux and spectral index of the dominant region of extended radio emission, this upper limit implies a lower limit of ∼0.4 μG on the mean, volume-averaged, intracluster magnetic field in A3667.

Original languageEnglish
Pages (from-to)825-828
Number of pages4
JournalAstrophysical Journal
Issue number2 I
StatePublished - 10 May 2004


  • Galaxies: clusters: general
  • Galaxies: clusters: individual (A2256)
  • Galaxies: magnetic fields
  • Radiation mechanisms: nonthermal


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