Rosat All Sky Survey
Rosat All Sky Survey . The skyfield_number represents the rass sequence id number of the sky field. (for comparison, the surface of the sun is about 5,000 kelvin.) ROSAT AllSky Survey 3/4 keV from heasarc.gsfc.nasa.gov The sources have a detection likelihood of at least 15 and contain at least 15 source photons. The temperatures of these sources ranged from about 100,000 kelvin to 20 million kelvin! The maps cover approximately 98 % of the sky in the 1/4 kev, 3/4 kev, and 1.5 kev bands, with an angular resolution of about 2 degrees and high sensitivity for low surface brightness extended.