X-ray spectrum?
Most are fitted by diskbb with
scattering
T Tcol = f Teff where f ~ 1.5 – 3; Tcol ~ 1 keV
Others are
fitted by a simple power-law
Tcol = 1.1 keV, Lx = 2.7 x 1039 erg/s
X-6 in M 81
(Swartz et al 2002)
Some are
³super-soft², T ~ 0.07 keV, Lbol ~ 1039 erg/s
A few can be
identified as SNR