Soft X-ray Diffuse Background: ROSAT 0.75 keV All-Sky Map

3/4 keV diffuse background map from the ROSAT all-sky survey in the same projection as Figure 1. The image shows a radically different structure than the 1/4 keV background of Figure 1. At 3/4 keV, the sky is dominated by the relatively smooth extragalactic background and a limited number of bright extended Galactic objects.

Credit: The Max Planck Institute for Extraterrestrial Physics, Snowden et al. 1995, ApJ, 454, 643