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Photon-dominated Hydrodynamics
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DOI：10.3847/1538-4357/abd093.png)
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Abstract
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Some subtle distinctions between optically thin emission and optically thick emission (with a dynamically passive source of opacity) from an emitting surface are drawn. It is noted that photons may escape a region of high optical depth by dragging the opaque material with them, and that optically thick emission can have a shorter scale of variation than optically thin emission and less light echoing.
Keywords:
Gamma-ray transient sources