Ultra-compact X-ray binaries exhibit similar hard X-ray spectral properties to standard low-mass X-ray binaries, including typical continuum values per state, with higher Comptonisation fractions in soft states and a very cold hard state discovered in 4U 1626-67.
B.3:Left:Spectrum of IGR J16597−3704.Right:Spectrum of 4U 1916−053
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The NuSTAR view of Ultra-Compact X-ray Binaries
Ultra-compact X-ray binaries exhibit similar hard X-ray spectral properties to standard low-mass X-ray binaries, including typical continuum values per state, with higher Comptonisation fractions in soft states and a very cold hard state discovered in 4U 1626-67.