The X-ray spectra in this figure show evidence for a wind in GRO J1655-40. The dips seen here are produced by absorption from a wide variety of atoms in the gas around the black hole. The blue line shows the Chandra spectrum of J1655 and the yellow line shows a model spectrum. In the model spectrum the absorption dips are plotted at their natural wavelengths, that is their expected location for gas that is not undergoing bulk motion either towards or away from us. Comparing the two spectra shows that the Chandra spectrum is shifted towards shorter wavelengths because of the Doppler effect, giving evidence for a wind blowing towards us. (Credit: NASA/CXC/U.Michigan/J.Miller et al.)
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The X-ray spectra in this figure show evidence for a wind in GRO J1655-40. The dips seen here are produced by absorption from a wide variety of atoms in the gas around the black hole. The blue line shows the Chandra spectrum of J1655 and the yellow line shows a model spectrum. In the model spectrum the absorption dips are plotted at their natural wavelengths, that is their expected location for gas that is not undergoing bulk motion either towards or away from us. Comparing the two spectra shows that the Chandra spectrum is shifted towards shorter wavelengths because of the Doppler effect, giving evidence for a wind blowing towards us. (Credit: NASA/CXC/U.Michigan/J.Miller et al.)
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