A NuSTAR and Swift view of the hard state of MAXI J1813-095
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY(2022)
Abstract
We present an analysis of the NuSTAR and Swift spectra of the black hole candidate MAXI J1813-095 in a failed-transition outburst in 2018. The NuSTAR observations show evidence of reflected emission from the inner region of the accretion disc. By modelling the reflection component in the spectra, we find a disc inner radius of R-in < 7 r(g). This result suggests that either a slightly truncated disc or a non-truncated disc forms at a few per cent of the Eddington limit in MAXI J1813-095. Our best-fitting reflection models indicate that the geometry of the innermost accretion remains consistent during the period of NuSTAR observations. The spectral variability of MAXI J1813-095 from multi-epoch observations is dominated by the variable photon index of the Comptonization emission.
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Key words
accretion,accretion discs,black hole physics,X-rays: binaries
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