Astronomy and Astrophysics, volume 391, 903-909 (2002/9-1)
High resolution soft X-ray spectroscopy of M 87 with the reflection grating spectrometers on XMM-Newton.
SAKELLIOU I., PETERSON J.R., TAMURA T., PAERELS F.B.S., KAASTRA J.S., BELSOLE E., BOEHRINGER H., BRANDUARDI-RAYMONT G., FERRIGNO C., DEN HERDER J.W., KENNEA J., MUSHOTZKY R.F., VESTRAND W.T. and WORRALL D.M.
Abstract (from CDS):
We present high-resolution X-ray spectroscopic observations of M 87 with the Reflection Grating Spectrometers on XMM-Newton. We detect strong K-shell line emission from N, O, Ne, Mg, some emission from He-like Si, a fully resolved set of Fe L-shell emission spectra, and some emission from C. The angular intensity distributions of the strong emission lines are detectably resolved on scales (15-160)". The gas in the inner arcmin of M 87 has a multi-phase structure, as indicated by the similarity of the emission line profiles of Fe L shell ions with widely separated ionization potentials. The global Fe L spectrum is approximately consistent with an isothermal plasma at kTe∼1.8keV, in addition to a component with a temperature distribution appropriate to an isobaric cooling flow, but with a minimum temperature cutoff of kTmin≃600eV. The behaviour of this cooling-flow component is qualitatively similar to what is seen in other cooling flow clusters. Finally, we do not find any strong evidence for a spatial variation in abundances due to resonance scattering redistribution in the inner arcminute of the core.
galaxies: clusters: general - galaxies: clusters: individual: Virgo - galaxies: individual: M 87 - galaxies: cooling flows - galaxies: abundances - X-rays: galaxies
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