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  Rapid elimination of small dust grains in molecular clouds

Silsbee, K., Ivlev, A. V., Sipilä, O., Caselli, P., & Zhao, B. (2020). Rapid elimination of small dust grains in molecular clouds. Astronomy and Astrophysics, 641: A39. doi:10.1051/0004-6361/202038063.

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Silsbee, Kedron1, Author              
Ivlev, Alexej V.1, Author              
Sipilä, Olli1, Author              
Caselli, Paola1, Author              
Zhao, Bo1, 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 argue that impact velocities between dust grains with sizes of less than ∼0.1 μm in molecular cloud cores are dominated by drift arising from ambipolar diffusion. This effect is due to the size dependence of the dust coupling to the magnetic field and the neutral gas. Assuming perfect sticking in collisions up to ≈50 m s−1, we show that this effect causes rapid depletion of small grains, consistent with starlight extinction and IR and microwave emission measurements, both in the core center (n ∼ 106 cm−3) and envelope (n ∼ 104 cm−3). The upper end of the size distribution does not change significantly if only velocities arising from this effect are considered. We consider the impact of an evolved grain-size distribution on the gas temperature, and argue that if the depletion of small dust grains occurs as expected from our model, then the cosmic ray ionization rate must be well below 10−16 s−1 at a number density of 105 cm−3.

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Language(s): eng - English
 Dates: 2020-09-04
 Publication Status: Published online
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 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361/202038063
Other: LOCALID: 3267199
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 641 Sequence Number: A39 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1