Last updated on April 16, 2014 at 17:34 EDT
RGS spectrum of HR1099
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RGS spectrum of HR1099

January 24, 2013
RGS spectrum of the star known as HR1099. The spectrum illustrates the way the RGS works; it decomposes X-ray 'light' into its components, like a prism does with visible light. The inserted image shows what is referred to as a 'banana' image. The horizontal axis shows the detected X-ray photons (X-ray light particles) plotted as a function of the position on the detector (strip of nine CCDs) and as a function of the energy of the photons, as determined by the CCDs, along the vertical axis.