Luminous Supersoft X-ray Sources
Luminous super soft X-ray sources have a characteristic blackbody temperature of a few tens of eV (~20-100 eV) and a bolometric luminosity of ~1038 erg/s (below ~ 3 x 1038 erg/s).
Apparently, luminous SSSs can have equivalent blackbody temperatures as low as ~15 eV and luminosities ranging from 1036 to 1038 erg/s. The numbers of luminous SSSs in the disks of ordinary spiral galaxies such as the MW and M31 are estimated to be on the order of 103.
Read more about this topic: Super Soft X-ray Source
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