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dc.contributor.authorVandenbroucke, Bert
dc.contributor.authorWood, Kenneth
dc.contributor.authorGirichidis, Philipp
dc.contributor.authorHill, Alex S.
dc.contributor.authorPeters, Thomas
dc.identifier.citationVandenbroucke , B , Wood , K , Girichidis , P , Hill , A S & Peters , T 2018 , ' Radiative transfer calculations of the diffuse ionized gas in disc galaxies with cosmic ray feedback ' , Monthly Notices of the Royal Astronomical Society , vol. 476 , no. 3 , pp. 4032-4044 .
dc.identifier.otherORCID: /0000-0001-7241-1704/work/50167443
dc.descriptionBV and KW acknowledge support from STFC grant ST/M001296/1. PG acknowledges support from the DFG Priority Program 1573 Physics of the Interstellar Medium as well as funding from the European Research Council under ERC-CoG grant CRAGSMAN-646955.en
dc.description.abstractThe large vertical scale heights of the diffuse ionized gas (DIG) in disc galaxies are challenging to model, as hydrodynamical models including only thermal feedback seem to be unable to support gas at these heights. In this paper, we use a three-dimensional Monte Carlo radiation transfer code to post-process disc simulations of the Simulating the Life-Cycle of Molecular Clouds project that include feedback by cosmic rays. We show that the more extended discs in simulations including cosmic ray feedback naturally lead to larger scale heights for the DIG which are more in line with observed scale heights. We also show that including a fiducial cosmic ray heating term in our model can help to increase the temperature as a function of disc scale height, but fails to reproduce observed DIG nitrogen and sulphur forbidden line intensities. We show that, to reproduce these line emissions, we require a heating mechanism that affects gas over a larger density range than is achieved by cosmic ray heating, which can be achieved by fine tuning the total luminosity of ionizing sources to get an appropriate ionizing spectrum as a function of scale height. This result sheds a new light on the relation between forbidden line emissions and temperature profiles for realistic DIG gas distributions.
dc.relation.ispartofMonthly Notices of the Royal Astronomical Societyen
dc.subjectRadiative transferen
dc.subjectMethods: numericalen
dc.subjectCosmic raysen
dc.subjectGalaxies: ISMen
dc.subjectGalaxies: structureen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleRadiative transfer calculations of the diffuse ionized gas in disc galaxies with cosmic ray feedbacken
dc.typeJournal articleen
dc.contributor.sponsorScience & Technology Facilities Councilen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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