Abstract
We have obtained a 63?ks Chandra ACIS-I observation of the Wolf-Rayet + black hole binary NGC?300 X-1. We measure rapid low-amplitude variability in the 0.35-8?keV light curve. The power density spectrum has a power-law index ? = 1.02 ? 0.15 consistent with an accreting black hole in a steep power-law state. When compared to previous studies of NGC?300 X-1 performed with XMM-Newton, we find the source at the low end of the previously measured 0.3-10?keV luminosity. The spectrum of NGC?300 X-1 is dominated by a power law (? = 2.0 ? 0.3) with a contribution at low energies by a thermal component. We estimate the 0.3-10?keV luminosity to be 2.6+0.8 ?1.0 ? 1038?erg?s?1. The timing and spectroscopic properties of NGC?300 X-1 are consistent with being in a steep power-law state, similar to earlier observations performed with XMM-Newton. We additionally compare our observations to known high-mass X-ray binaries and ultraluminous X-ray sources, and find the properties of NGC?300 X-1 are most consistent with black hole high-mass X-ray binaries.
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