Statistics – Computation
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...297..476b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 297, Oct. 15, 1985, p. 476-491.
Statistics
Computation
233
Astronomical Models, Emission Spectra, Galactic Nuclei, Interstellar Gas, Shock Wave Propagation, Thermal Instability, Computational Astrophysics, Extreme Ultraviolet Radiation, Photoionization, Plasma Cooling, Radiative Transfer, Recombination Reactions, X Ray Sources
Scientific paper
The ionization structure and emission spectrum (optical and infrared) produced by low-density plasma cooling from initial temperatures as high as 10 exp 7.2 K are investigated. For initial temperatures higher than 10 exp 5.4 K, the optical spectra are dominated by emission from the low-temperature (about 10,000 K) photoionized regions that result from reabsorption of EUV ionizing flux emitted in the high-temperature zones. The predicted line intensities compare favorably with the emission filaments observed in M87 and NGC 1275, which are here assumed to result from cooling of an intracluster X-ray-emitting hot gas. A certain ambiguity makes it difficult in practice to choose between the latter models and pure photoionization models.
Binette Luc
Dopita Mike A.
Tuohy Ian R.
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