منابع مشابه
Optical , UV , and X - Ray Scattering by Interstellar Dust Grains
Scattering and absorption properties at optical, ultraviolet, and X-ray wavelengths are calculated for an interstellar dust model consisting of carbonaceous grains and amorphous silicate grains. The widely-used Henyey-Greenstein phase function provides a good approximation for the scattering phase function at wavelengths between ∼0.4 and 1µm, but fails to fit the calculated phase functions at s...
متن کاملDust Scattering X-ray Expanding Rings around Gamma-ray Bursts
— Scattering by dust grains in our Galaxy can produce X–ray halos, visible as expanding rings, around GRBs. This has been observed in three GRBs to date, allowing to derive accurate distances for the dust clouds as well as some constraints on the prompt GRB X–ray emission that was not directly observed. We developed a new analysis method to study dust scattering expanding rings and have applied...
متن کاملBehaviors of X-ray Dust-Scattering and Implications for X-ray Afterglows of Gamma-Ray Bursts
The afterglows of gamma-ray bursts (GRBs) have been commonly assumed to be due to shocks sweeping up circum-stellar medium. However, most of them have been found to be hosting in dense star-forming regions where a significant fraction of the prompt X-ray emission can be scattered by dust grains. Here we revisit the behaviors of X-ray dust-scattering in GRBs. We find that the features of some X-...
متن کاملBehavior of X-Ray Dust Scattering and Implications for X-Ray Afterglows of Gamma-Ray Bursts
The afterglows of gamma-ray bursts (GRBs) have commonly been assumed to be due to shocks sweeping up the circum-stellar medium. However, most GRBs have been found in dense star-forming regions where a significant fraction of the prompt X-ray emission can be scattered by dust grains. Here we revisit the behavior of dust scattering of X-rays in GRBs. We find that the features of some X-ray afterg...
متن کاملSoft X-ray Scattering and Halos from Dust
Small angle scatterings of X-rays by interstellar dust particles create halos around x-ray sources. The halo intensity and its projected radial distribution around a source can provide important information on the spatial distribution of the dust along the line of sight to the source, and on the physical properties of the scattering dust particles. Halos around x-ray point sources have been use...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1985
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/213.1.1p