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      Radiative cooling rates, ion fractions, molecule abundances and line emissivities including self-shielding and both local and metagalactic radiation fields

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          Abstract

          We use the spectral synthesis code \textsc{cloudy} to tabulate the properties of gas for an extensive range in redshift (z=0 to 9), temperature (log T [K] = 1 to 9.5), metallicity (log Z/\(\mathrm{Z}_{\odot}\) = -4 to +0.5, Z=0), and density (log \(n_{\mathrm{H}}\) [\(\mathrm{cm}^{-3}\)] = -8 to +6). This therefore includes gas with properties characteristic of the interstellar, circumgalactic and intergalactic media. The gas is exposed to a redshift-dependent UV/X-ray background, while for the self-shielded lower-temperature gas (i.e. ISM gas) an interstellar radiation field and cosmic rays are added. The radiation field is attenuated by a density- and temperature-dependent column of gas and dust. Motivated by the observed star formation law, this gas column density also determines the intensity of the interstellar radiation field and the cosmic ray density. The ionization balance, molecule fractions, cooling rates, line emissivities, and equilibrium temperatures are calculated self-consistently. We include dust, cosmic rays, and the interstellar radiation field step-by-step to study their relative impact. These publicly available tables are ideal for hydrodynamical simulations. They can be used stand alone or coupled to a non-equilibrium network for a subset of elements. The release includes a C routine to read in and interpolate the tables, as well as an easy to use python graphical user interface to explore the tables.

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          Author and article information

          Journal
          25 June 2020
          Article
          2006.14322
          b0a57568-8abe-48d0-a6a5-23c46242c619

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Submitted to MNRAS, comments welcome; 29 pages, 24 figures; for data files and more info see: https://www.sylviaploeckinger.com/radcool
          astro-ph.GA

          Galaxy astrophysics
          Galaxy astrophysics

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