Perseus (X-ray Colors)
Image credit: Max-Planck-Institut für extraterrestrische Physik (MPE)
This shows the X-ray hardness of the same field as the PSPC image of Perseus. Here red is for soft x-rays (ie. the general background), blue is for hard x-ray energies (ie. the cluster of galaxies at the bottom center), and yellow for intermediate energies (ie. the star Algol to the left bottom.
Please use the Feedback link if you have questions on ROSAT.