Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.3806d&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #38.06; Bulletin of the American Astronomical Society, Vol. 30, p.1302
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
An 8.3 hour observation of the Abell 2256 galaxy cluster using the Rossi X-ray Timing Explorer (RXTE) proportional counter array (PCA) produced a high quality spectrum in the 2 - 30 keV range. Joint fitting with the 0.7 - 11 keV spectrum obtained with the Advanced Satellite for Astrophysics and Cosmology (ASCA) Gas Imaging spectrometer (GIS) gives an upperlimit of ~ 2.3x10(-7) photons cm(-2) sec(-1) keV(-1) for non-thermal emission at 30 keV. This yields a lower limit to the mean magnetic field of 0.36mu G and an upperlimit of 1.8x10(-13) ergs cm(-3) for the cosmic-ray electron energy density. The resulting lower limit to the central magnetic field is ~ 1 - 3 mu G. While a magnetic field of ~ 0.1 - 0.2 mu G can be created by galaxy wakes, a magnetic field of several mu G is usually associated with a cooling flow or, as in the case of the Coma cluster, a subcluster merger. However, for A2256, the evidence for a merger is weak and the main cluster shows no evidence of a cooling flow. Thus, there is presently no satisfactory hypothesis for the origin of an average cluster magnetic field as high as > 0.36 mu G in the A2256 cluster.
Delzer C.
Henriksen Mark
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