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06 December 2021
 
  » arxiv » 1009.1026

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Non-equilibrium ionization states and cooling rates of the photoionized enriched gas
Evgenii O. Vasiliev ;
Date 6 Sep 2010
AbstractNon-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
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