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Monte Carlo radiative transfer in prestellar cores

Stamatellos, Dimitris and Whitworth, Anthony Peter 2003. Monte Carlo radiative transfer in prestellar cores. Presented at: International Astronomical Union Symposium 221, Sydney, Australia, 22-25 July 2003.

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We will present radiative transfer calculations of non-embedded and embedded prestellar cores performed using our accurate Monte Carlo code. Our results for embedded cores indicate that the temperature profiles inside these cores are less steep than those in non-embedded cores. Deeply embedded cores (ambient cloud with visual extinction larger than 15-25) are almost isothermal at around 7-8 K. The temperature inside cores surrounded by even an ambient cloud of moderate thickness (AV˜ 5) is less than 12 K which is lower than previous studies have assumed. Our study shows that the best wavelength range to observe embedded prestellar cores is 400-500 μm where the core is quite distinct from the background. We also predict that very sensitive observations at 170-200 μm can be used to estimate how deeply a core is embedded in its parent molecular cloud. The upcoming HERSCHEL mission (ESA 2007) will in principle be able to detect these features and test our models. Finally we will present preliminary results from our ongoing study of asymmetric models of prestellar cores (asymmetric cores asymmetric ambient cloud and/or anisotropic external radiation field) and applications to cores and condensations in embedded protoclusters like ρ Oph

Item Type: Conference or Workshop Item (Poster)
Date Type: Completion
Status: Unpublished
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Last Modified: 04 Jun 2017 07:52

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