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1999MNRAS.310..483B - Mon. Not. R. Astron. Soc., 310, 483-510 (1999/December-1)
X-ray emission lines and multiphase gas in elliptical galaxies and galaxy clusters.
BUOTE D.A., CANIZARES C.R. and FABIAN A.C.
Abstract (from CDS):
We re-analyse the ASCA spectra of three of the brightest galaxy clusters to assess the evidence for multiphase gas in their cores: M87 (Virgo), the Centaurus cluster and the Perseus cluster. Kα emission-line blends of Si, S, Ar, Ca and Fe are detected in each system, as is significant Fe Kβ emission. The Fe Kβ/Kα ratios are consistent with optically thin plasma models and do not suggest resonance scattering in these systems. Consideration of both the ratios of H-like to He-like Kα lines and the local continuum temperatures clearly rules out isothermal gas in each case. To obtain more detailed constraints, we fitted plasma models over 1.6-9keV where the emission is dominated by these K shell lines and by continuum. In each case the ASCA spectra cannot determine whether the gas emits at only two temperatures or over a continuous range of temperatures as expected for a cooling flow. The metal abundances are near-solar for all of the multiphase models. We discuss the implications of these results and examine the prospects for determining the temperature structure in these systems with upcoming X-ray missions.
Abstract Copyright: 1999, Royal Astronomical Society
Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: clusters: general - galaxies: evolution - galaxies: general - X-rays: galaxies
Simbad objects: 11
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