Small-scale clustering of nano-dust grains in supersonic turbulence
2019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 490, no 4, p. 5788-5797Article in journal (Refereed) Published
Abstract [en]
We investigate the clustering and dynamics of nano-sized particles (nano dust) in high-resolution (10243) simulations of compressible isothermal hydrodynamic turbulence. It is well established that large grains will decouple from a turbulent gas flow, while small grains will tend to trace the motion of the gas. We demonstrate that nano-sized grains may cluster in a turbulent flow (fractal small-scale clustering), which increases the local grain density by at least a factor of a few. In combination with the fact that nano-dust grains may be abundant in general, and the increased interaction rate due to turbulent motions, aggregation involving nano dust may have a rather high probability. Small-scale clustering will also affect extinction properties. As an example we present an extinction model based on silicates, graphite, and metallic iron, assuming strong clustering of grain sizes in the nanometre range, could explain the extreme and rapidly varying ultraviolet extinction in the host of GRB 140506A.
Place, publisher, year, edition, pages
Oxford University Press , 2019. Vol. 490, no 4, p. 5788-5797
Keywords [en]
Dust, Extinction, Hydrodynamics, ISM: Clouds, Turbulence
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-301487DOI: 10.1093/mnras/stz2957ISI: 000504000300098Scopus ID: 2-s2.0-85079660266OAI: oai:DiVA.org:kth-301487DiVA, id: diva2:1595565
Note
Export Date: 8 September 2021; Article; CODEN: MNRAA; Funding details: Danmarks Grundforskningsfond, DNRF; Funding details: Vetenskapsrådet, VR, 2015-04505; Funding text 1: This project is supported by the Swedish Research Council (Swedish: Vetenskapsrådet), grant no. 2015-04505. The Cosmic Dawn Center is funded by the DNRF. The anonymous reviewer is thanked for their insightful criticism, which helped to improve the paper. We also wish to thank our colleagues Akshay Bhatnagar and Dhrubaditya Mitra for sharing their simulation data and for all their help and support.
Correction in: Monthly notices of the Royal Astronomical Society, Vol. 492, no 3, p. 4512-4512. DOI: 10.1093/mnras/staa254.
QC 20210920.QC 20210921.
2021-09-202021-09-202024-03-18Bibliographically approved