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NuSTAR and Swift observations of Swift J1357.2-0933 during an early phase of its 2017 outburst

Stiele, H. and Kong, A. K. H. (2018) NuSTAR and Swift observations of Swift J1357.2-0933 during an early phase of its 2017 outburst. Astrophysical Journal, 852 (1). Art. No. 34. ISSN 0004-637X. doi:10.3847/1538-4357/aa9d3e.

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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.

Item Type:Article
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URLURL TypeDescription Paper
Kong, A. K. H.0000-0002-5105-344X
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 - .
Funding AgencyGrant Number
Ministry of Science and Technology (Taipei)105-2112-M-007-033-MY2
Ministry of Science and Technology (Taipei)105-2811-M-007-065
Subject Keywords:binaries: close; stars: black holes; X-rays: binaries; X-rays: individual (Swift J1357.2-0933)
Issue or Number:1
Record Number:CaltechAUTHORS:20171211-120811608
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Official Citation:H. Stiele and A. K. H. Kong 2018 ApJ 852 34
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83802
Deposited By: Joy Painter
Deposited On:12 Dec 2017 22:01
Last Modified:15 Nov 2021 20:14

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