NuSTAR and Swift Observations of Swift J1357.2–0933 During an Early Phase of Its 2017 Outburst
2018
We present a detailed spectral analysis of Swift and NuSTAR observations of
the very faint X-ray transient and black hole system Swift J1357.2-0933 during
an early low hard state of its 2017 outburst. Swift J1357.2-0933 was observed
at $\sim$0.02% of the Eddington luminosity (for a distance of 2.3 kpc and a
mass of 4 M$_{\odot}$). Despite the low luminosity, the broadband X-ray
spectrum between 0.3 and 78 keV requires the presence of a disk blackbody
component with an inner disk temperature of T$_{\mathrm{in}}$ $\sim$ 0.06 keV
in addition to a thermal Comptonization component with a photon index of
{\Gamma} $\sim$ 1.70. Using a more physical model, which takes strong
relativistic effects into account, and assuming a high inclination of
70$^\circ$, which is motivated by the presence of dips in optical light curves,
we find that the accretion disk is truncated within a few RISCO from the black
hole, independent of the spin.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
61
References
3
Citations
NaN
KQI