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What does it mean in astrophysics for X-rays to be reflected?
Various articles about black holes talk about X-rays emitted near the
event horizon 'reflecting off the accretion disc'. What kind of material is it that can *reflect* X-rays? I've worked in X-ray crystallography, and we needed grazing incidence off very precisely figured monocrystalline silicon to get something that reflected X-rays at 12.7keV (selenium K line); astrophysical X-rays seem to be more at iron K which is about half that energy, but still generally-occuring materials either absorb or transmit them. Is this in fact more like the process around a nuclear detonation, where things absorb X-rays and are themselves heated to X-ray-emitting temperatures? Tom [[Mod. note -- Yes, thermal re-emission is one possibility. Compton scattering is another possibility. As you note, coherent reflection seems unlikely. -- jt]] |
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