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Monte Carlo radiative transfer in SPH density fields

Stamatellos, Dimitrios and Whitworth, Anthony Peter 2005. Monte Carlo radiative transfer in SPH density fields. Astronomy and Astrophysics 439 (1) , pp. 153-158. 10.1051/0004-6361:20052951

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Abstract

We combine a Monte Carlo radiative transfer code with an SPH code, so that - assuming thermal equilibrium - we can calculate dust-temperature fields, spectral energy distributions, and isophotal maps, for the individual time-frames generated by an SPH simulation. On large scales, the radiative transfer cells (RT cells) are borrowed from the tree structure built by the SPH code, and are chosen so that their size - and hence the resolution of the calculated temperature field - is comparable with the resolution of the density field. We refer collectively to these cubic RT cells as the global grid. The code is tested and found to treat externally illuminated dust configurations very well. However, when there are embedded discrete sources, i.e. stars, these produce very steep local temperature gradients which can only be modelled properly if - in the immediate vicinity of, and centred on, each embedded star - we supplement the global grid with a star grid of closely spaced concentric RT cells.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: ISM: clouds; ISM: structure; ISM: dust, extinction; methods: numerical; radiative transfer; hydrodynamics
Additional Information: Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0004-6361/ (accessed 17/04/2014)
Publisher: edp sciences
ISSN: 0004-6361
Date of First Compliant Deposit: 30 March 2016
Last Modified: 04 Jun 2017 04:56
URI: http://orca.cf.ac.uk/id/eprint/46579

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