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2009MNRAS.392.1475F - Mon. Not. R. Astron. Soc., 392, 1475-1502 (2009/February-1)
Collisional heating as the origin of filament emission in galaxy clusters.
FERLAND G.J., FABIAN A.C., HATCH N.A., JOHNSTONE R.M., PORTER R.L., VAN HOOF P.A.M. and WILLIAMS R.J.R.
Abstract (from CDS):
We calculate the chemistry, ionization, temperature, gas pressure and emission-line spectrum for a wide range of gas densities and collisional heating rates. We assume that the filaments are magnetically confined. The gas is free to move along field lines so that the gas pressure is equal to that of the surrounding hot gas. A mix of clouds, some being dense and cold and others hot and tenuous, can exist. The observed spectrum will be the integrated emission from clouds with different densities and temperatures but the same pressure P/k = nT. We assume that the gas filling factor is given by a power law in density. The power-law index, the only free parameter in this theory, is set by matching the observed intensities of infrared H2 lines relative to optical Hi lines. We conclude that the filaments are heated by ionizing particles, either conducted in from surrounding regions or produced in situ by processes related to MHD waves.
Abstract Copyright: © 2008 The Authors and British Crown Copyright 2008/MOD. Journal compilation © 2008 RAS
Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: NGC 1275 - galaxies: clusters: individual: NGC 4696 - intergalactic medium - infrared: galaxies
Simbad objects: 5
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