A Deep Chandra Observation of the Wolf-Rayet + Black Hole Binary NGC 300 X-1

Details A Deep Chandra Observation of the Wolf-Rayet + Black Hole Binary NGC 300 X-1 A Deep Chandra Observation of the Wolf-Rayet + Black Hole Binary NGC 300 X-1

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...742..128b&link_type=abstract

The Astrophysical Journal, Volume 742, Issue 2, article id. 128 (2011).

Astronomy and Astrophysics

Astronomy

Accretion, Accretion Disks, Stars: Wolf-Rayet, X-Rays: Binaries

Scientific paper

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 γ = 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 (Γ = 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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