To calculate the ionization and temperature structure in the interstellar gas we used spherically symmetric photoionization models and state-of-the-art three-dimensional (3D) non-LTE radiative transfer simulations, considering hydrogen, helium, and the most abundant metals.
For the ionizing fluxes we computed a grid of stellar spectral energy distributions (SEDs) from detailed, fully non-LTE model atmospheres that include the effects of stellar winds and line blocking and blanketing. We systematically explore a plausible subset of the parameter space involving effective temperatures and metallicities of the ionizing sources, the effects of the hardening of their radiation by surrounding “leaky” H II regions with different escape fractions, as well as different scenarios for the clumpiness of the DIG, and compute the resulting line strength ratios for a number of diagnostic optical emission lines. Key to understanding the ionization mechanisms in the DIG is the line emission by the ionized gas.Īims. Institut für Astronomie und Astrophysik der Ludwig-Maximilians-Universität München,Į-mail: The diffuse ionized gas (DIG) constitutes the largest fraction of the total ionized interstellar matter in star-forming galaxies, but it is still unclear whether the ionization is driven predominantly by the ionizing radiation of hot massive stars, as in H II regions, or whether additional sources of ionization have to be considered.
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To request any other DNS record type, we can provide the type option in the command line: # dig > DiG 9.9.5-9+deb8u5-Debian > global options: +cmd Got answer: ->HEADER<<- opcode: QUERY, status: NOERROR, id: 44321 flags: qr rd ra QUERY: 1, ANSWER: 5, AUTHORITY. Without providing any options besides the domain name, the dig command will only return the A record of a domain. With dig, you can ask the system to process a list of lookup requests from a file. The advantages of dig compared to host are its flexibility and clarity of output. Besides the host command, you can also use the dig command to do DNS interrogation.
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