SIMBAD references

2002ApJ...567..762M - Astrophys. J., 567, 762-771 (2002/March-2)

Nonthermal X-ray emission: an alternative to cluster cooling flows.


Abstract (from CDS):

We report the results of experiments aimed at reducing the major problem with cooling flow models of rich cluster X-ray sources, i.e., the fact that most of the cooled gas or its products have not been found. Here we show that much of the X-ray emission usually attributed to cooling flows can, in fact, be modeled by a power-law component which is indicative of a source(s) other than thermal bremsstrahlung from the intracluster medium. We find that adequate simultaneous fits to ROSAT PSPC and ASCA GIS/SIS spectra of the central regions of 10 clusters are obtained for two-component models that include a thermal plasma component that is attributable to hot intracluster gas and a power-law component that is likely generated by compact sources and/or extended nonthermal emission. For five of the clusters that purportedly have massive cooling flows, the best-fit models have power-law components that contribute ∼30% of the total flux (0.14-10.0 keV) within the central 3'. Because cooling flow mass deposition rates are inferred from X-ray fluxes, our finding opens the possibility of significantly reducing cooling rates.

Abstract Copyright:

Journal keyword(s): Galaxies: Cooling Flows - X-Rays: Galaxies - X-Rays: Galaxies: Clusters

Simbad objects: 20

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