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The initial conditions of high-mass star formation: radiative transfer models of IRDCs seen in theHerschelHi-GAL survey

Wilcock, Lucy Ann, Kirk, Jason M., Stamatellos, Dimitrios, Ward-Thompson, Derek ORCID:, Whitworth, Anthony Peter ORCID:, Battersby, C., Brunt, C., Fuller, G. A., Griffin, Matthew Joseph ORCID:, Molinari, S., Martin, P., Mottram, J. C., Peretto, Nicolas ORCID:, Plume, R., Smith, H. A. and Thompson, M. A. 2011. The initial conditions of high-mass star formation: radiative transfer models of IRDCs seen in theHerschelHi-GAL survey. Astronomy & Astrophysics 526 , A159. 10.1051/0004-6361/201015488

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The densest infrared dark clouds (IRDCs) may represent the earliest observable stage of high-mass star formation. These clouds are very cold, hence they emit mainly at far-infrared and sub-mm wavelengths. For the first time, Herschel has provided multi-wavelength, spatially resolved observations of cores within IRDCs, which, when combined with radiative transfer modelling, can constrain their properties, such as mass, density profile and dust temperature. We use a 3D, multi-wavelength Monte Carlo radiative transfer code to model in detail the emission from six cores in three typical IRDCs seen in the Hi-GAL survey (G030.50+00.95, G031.03+00.26 and G031.03+00.76), and thereby to determine the properties of these cores and compare them with their low-mass equivalents. We found masses ranging from 90 to 290 M⊙ with temperatures from 8 to 11K at the centre of each core and 18 to 28 K at the surface. The maximum luminosity of an embedded star within each core was calculated, and we rule out the possibility of significant high mass star formation having yet occurred in three of our cores.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Physics and Astronomy
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Uncontrolled Keywords: stars: formation; ISM: clouds; dust, extinction.
Additional Information: 9 pp.
Publisher: EDP Sciences
ISSN: 0004-6361
Last Modified: 11 Oct 2023 22:05

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