NuSTAR and Swift observations of Swift J1357.2-0933 during an early phase of its 2017 outburst
- Creators
- Stiele, H.
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Kong, A. K. H.
Abstract
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 ~0.02% of the Eddington luminosity (for a distance of 2.3 kpc and a mass of 4 M_⊙). 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_(in) ~ 0.06 keV in addition to a thermal Comptonization component with a photon index of Γ ~ 1.70. Using a more physical model, which takes strong relativistic effects into account, and assuming a high inclination of 70°, which is motivated by the presence of dips in optical light curves, we find that the accretion disk is truncated within a few R_(ISCO) from the black hole, independent of the spin.
Additional Information
© 2018. The American Astronomical Society. Received 2017 June 29; revised 2017 November 10; accepted 2017 November 23; published 2018 January 3. We thank Fiona Harrison, Brad Cenko, and the schedulers and SOC of Swift and NuSTAR for making these observations possible. This project is supported by the Ministry of Science and Technology of the Republic of China (Taiwan) through grants 105-2112-M-007-033-MY2 and 105-2811-M-007-065. This research has made use of data obtained through the High Energy Astrophysics Science Archive Research Center Online Service, provided by the NASA/Goddard Space Flight Center. Facilities: NuSTAR - The NuSTAR (Nuclear Spectroscopic Telescope Array) mission, Swift - .Attached Files
Submitted - 1712.02804.pdf
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Additional details
- Eprint ID
- 83802
- Resolver ID
- CaltechAUTHORS:20171211-120811608
- 105-2112-M-007-033-MY2
- Ministry of Science and Technology (Taipei)
- 105-2811-M-007-065
- Ministry of Science and Technology (Taipei)
- Created
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2017-12-12Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field
- Caltech groups
- NuSTAR