Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...405l..17c&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 405, no. 1, p. L17-L20.
Astronomy and Astrophysics
Astrophysics
10
Cold Gas, Cooling Flows (Astrophysics), Evaporation, Galactic Clusters, X Ray Spectra, Intergalactic Media, Interstellar Gas, Luminosity, X Ray Sources
Scientific paper
This paper considers the possibility that 'cooling flow' clusters are really 'heating flow' clusters in which cold gas clouds evaporate in the hot intracluster medium. Total X-ray luminosity was calculated as a function of the total evaporation rate. X-ray line emissivity for evaporating clouds was also calculated using a nonequilibrium ionization code. The calculated X-ray luminosity and X-ray line emissivity are approximately 1000 times smaller than for cooling clouds. Other comparisons were made using measured line fluxes for M87 and Perseus cluster. Results indicate that evaporative heating flow models require mass fluxes much greater than cooling flow models to explain the same X-ray emission. This requirement exceeds any plausible mass source. These conclusions are very general and serve to reject all heating flow models as viable alternatives to cooling flows.
Canizares Calude R.
Hughes John Patrick
Markert Thomas H.
Markoff Sera
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