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The Ubiquity of Micrometer-Sized Dust Grains in the Dense Interstellar Medium
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The Ubiquity of Micrometer-Sized Dust Grains in the Dense Interstellar Medium
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Cold molecular clouds are the birthplaces of stars and planets, where dense cores of gas collapse to form protostars. The dust mixed in these clouds is thought to be made of grains of an average size of 0.1 micrometer. We report the widespread detection of the coreshine effect as a direct sign of the existence of grown, micrometer-sized dust grains. This effect is seen in half of the cores we have analyzed in our survey, spanning all Galactic longitudes, and is dominated by changes in the internal properties and local environment of the cores, implying that the coreshine effect can be used to constrain fundamental core properties such as the three-dimensional density structure and ages and also the grain characteristics themselves.
Forward citations
Cited by 3 Pith papers
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Silicate cosmic dust grain collisions in the interstellar medium: A molecular dynamics study
MD simulations of 5-50 Å silicate grains find shattering thresholds of ~6 km/s for both SiO2 and astrodust compositions, twice the canonical 2.7 km/s value, with shattered size distributions inconsistent with prior po...
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CARPP: Parametric Radiative-Transfer Fitting of Molecular Cores from Dust Continuum Data
CARPP recovers seven core parameters from multi-band dust continuum via layered radiative transfer, achieving <20% average relative error under a stated noise-resolution criterion and classifying TMC-1C as near-critic...
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Silicate cosmic dust grain collisions in the interstellar medium: A molecular dynamics study
MD simulations yield silicate grain shattering thresholds of ~6 km/s and post-collision size distributions inconsistent with power-law predictions from Jones et al. (1996) and Hirashita & Kobayashi (2013).
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