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  Gas and dust temperature in prestellar cores revisited: New limits on cosmic-ray ionization rate

Ivlev, A. V., Silsbee, K., Sipilä, O., & Caselli, P. (2019). Gas and dust temperature in prestellar cores revisited: New limits on cosmic-ray ionization rate. The Astrophysical Journal, 884(2): 176. doi:10.3847/1538-4357/ab4252.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-85FB-A Version Permalink: http://hdl.handle.net/21.11116/0000-0005-85FC-9
Genre: Journal Article

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Gas and Dust Temperature in Prestellar Cores Revisited New Limits on Cosmic-Ray Ionization Rate.pdf (Any fulltext), 459KB
 
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Gas and Dust Temperature in Prestellar Cores Revisited New Limits on Cosmic-Ray Ionization Rate.pdf
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 Creators:
Ivlev, Alexej V.1, Author              
Silsbee, Kedron1, Author              
Sipilä, Olli1, Author              
Caselli, Paola1, Author              
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1Center for Astrochemical Studies at MPE, MPI for Extraterrestrial Physics, Max Planck Society, ou_1950287              

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 Abstract: We develop a self-consistent model for the equilibrium gas temperature and size-dependent dust temperature in cold, dense, prestellar cores, assuming an arbitrary power-law size distribution of dust grains. Compact analytical expressions applicable to a broad range of physical parameters are derived and compared with predictions of the commonly used standard model. It is suggested that combining the theoretical results with observations should allow us to constrain the degree of dust evolution and the cosmic-ray ionization rate in dense cores, and to help with discriminating between different regimes of cosmic-ray transport in molecular clouds. In particular, assuming a canonical MRN distribution of grain sizes, our theory demonstrates that the gas-temperature measurements in the prestellar core L1544 are consistent with an ionization rate as high as ~10−16 s−1, an order of magnitude higher than previously thought.

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 Dates: 2019-10-23
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab4252
Other: LOCALID: 3188318
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 884 (2) Sequence Number: 176 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3