Modeling of Interstellar Dust Grains
نویسندگان
چکیده
منابع مشابه
Interstellar Dust Grains
This review surveys the observed properties of interstellar dust grains: the wavelength-dependent extinction of starlight, including absorption features, from UV to infrared; optical luminescence; infrared emission; microwave emission; optical, UV, and X-ray scattering by dust; and polarization of starlight and of infrared emission. The relationship between presolar grains in meteorites and the...
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The temperatures of interstellar dust grains are analyzed using stochastic simulations, taking into account the grain composition and size and the discreteness of the photon flux. Grains of radii smaller than about 0.02 μm are found to exhibit large temperature fluctuations with narrow spikes following the absorption of UV photons. The temperatures of such grains may rise by a few × 10 K for ve...
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We present theoretical calculations of the X-ray scattering properties of porous grain aggregates with olivine monomers. The small and large angle scattering properties of these aggregates are governed by the global structure and substructure of the grain, respectively. We construct two diagnostics, RX and TX, based on the optical and X-ray properties of the aggregates, and apply them to a Chan...
متن کاملInterstellar Extinction by Spheroidal Dust Grains
Observations of interstellar extinction and polarization indicate that the interstellar medium consists of aligned non-spherical dust grains which show variation in the interstellar extinction curve for wavelengths ranging from NIR to UV. To model the extinction and polarization, one cannot use the conventional Mie theory which assumes the grains as solid spheres. We have used a T-matrix based ...
متن کاملExclusion of Tiny Interstellar Dust Grains From the Heliosphere
The distribution of interstellar dust grains (ISDG) observed in the Solar System depends on the nature of the interstellar medium-solar wind interaction. The charge of the grains couples them to the interstellar magnetic field (ISMF) resulting in some fraction of grains being excluded from the heliosphere while grains on the larger end of the size distribution, with gyroradii comparable to the ...
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ژورنال
عنوان ژورنال: Mapana - Journal of Sciences
سال: 2008
ISSN: 0975-3303,0975-3303
DOI: 10.12723/mjs.13.8