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Non-equilibrium ionization states and cooling rates of the photoionized enriched gas | | Evgenii O. Vasiliev
; | | Date: |
6 Sep 2010 | | Abstract: | Non-equilibrium (time-dependent) cooling rates and ionization state
computations are presented for low-density gas enriched with heavy elements
(metals) and photoionized by external ultraviolet/X-ray radiation. We consider
a wide range of gas densities and metallicities, and two types of external
radiation field: a power-law and the extragalactic background spectra. We have
found that the cooling efficiencies and ionic composition of enriched
photoionized gas significantly depend on the gas metallicity and density as
well as on the flux amplitude and the shape of ionizing radiation spectrum. The
cooling rates and ionic composition of gas in non-equilibrium photoionization
models appear to be close to those in the photoionization equilibrium only for
low metallicity and high ionizing flux, whereas in other conditions the
deviations from the equilibrium can be large and reach several times. We point
to the importance of use of non-equilibrium cooling rates and ionic states for
gas with metallicity close to solar and higher exposed to an arbitrary ionizing
radiation flux. Here we describe the parameter space (temperature, density,
metallicity and ionizing radiation flux), where the non-equilibrium cooling
rates should be used. | | Source: | arXiv, 1009.1026 | | Services: | Forum | Review | PDF | Favorites | |
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