Auriga (X-ray Colors)
This ROSAT All-Sky Survey image shows a newly discovered supernova remnant (the roughly circular emission near the top of the field) and the supernova remnant HB-9. The star Capella is clearly visible to the left of the image. The extended emission to the lower right from HB-9 is a cluster of galaxies containing a thousand galaxies. This image shows the X-ray hardness of the same field as the image Auriga. In the image, red indicates soft (low energy) (e.g., the general background), blue indicates hard (high energy) (e.g., the cluster of galaxies and a point source to the right between the two SNRs), and yellow indicates intermediate energies.
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