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

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 $\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 Γ $\sim$ 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.

arXiv comment11 pages, 5 figures, accepted for publication in ApJ

References in corpus (40)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• On the Absorption of X-rays in the Interstellar Medium
• The Swift X-ray Telescope
• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• The Swift Ultra-Violet/Optical Telescope
• Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
• Methods and results of an automatic analysis of a complete sample of Swift-XRT observations of GRBs
• Advection-Dominated Accretion: Underfed Black Holes and Neutron Stars
• The Burst Alert Telescope (BAT) on the Swift MIDEX Mission
• Advection-Dominated Accretion and the Spectral States of Black Hole X-Ray Binaries: Application to Nova Muscae 1991
• Broad-band gamma-ray and X-ray spectra of NGC 4151 and their implications for physical processes and geometry
• Improved Reflection Models of Black-Hole Accretion Disks: Treating the Angular Distribution of X-rays
• The May 1989 outburst of the Soft X-ray Transient GS 2023+338 (V404 Cyg)
• The evolution of the timing properties of the black-hole transient GX 339-4 during its 2002/2003 outburst
• The role of the reflection fraction in constraining black hole spin
• A New Model for Black Hole Soft X-ray Transients in Quiescence
• A Long, Hard Look at the Low-Hard State in Accreting Black Holes
• Iron fluorescence from within the innermost stable orbit of black hole accretion disks
• Modeling the Low State Spectrum of the X-Ray Nova XTE J1118+480
• X-ray irradiation in XTE J1817-330 and the inner radius of the truncated disc in the hard state
• Reprocessing of X-rays in the outer accretion disc of the black hole binary XTE J1817--330
• Complete and Simultaneous Spectral Observations of the Black-Hole X-ray Nova XTE J1118+480
• Truncation of the Inner Accretion Disk around a Black Hole at Low Luminosity
• The XMM-Newton/Chandra monitoring campaign of the Galactic center region: Description of the program and preliminary results
• No Time for Dead Time: Timing analysis of bright black hole binaries with NuSTAR
• Multiwavelength Spectrum of the Black Hole XTE J1118+480 in Quiescence
• A re--analysis of the iron line in the XMM-Newton data from the low/hard state in GX339--4
• A Black Hole Nova Obscured by an Inner Disk Torus
• Broadband X-ray Spectra of GX 339-4 and the Geometry of Accreting Black Holes in the Hard State
• Evidence for quiescent synchrotron emission in the black hole X-ray transient Swift J1357.2-0933
• Spectral analysis of the XMM-Newton data of GX 339-4 in the low/hard state: disc truncation and reflection
• Monitoring Chandra observations of the quasi-persistent neutron-star X-ray transient MXB 1659-29 in quiescence: the cooling curve of the heated neutron-star crust
• Multiwavelength spectral evolution during the 2011 outburst of the very faint X-ray transient Swift J1357.2-0933
• Swift J1357.2-0933: a massive black hole in the Galactic thick disc
• The return to the hard state of GX 339-4 as seen by Suzaku
• An X-ray view of the very faint black hole X-ray transient Swift J1357.2-0933 during its 2011 outburst
• A Clean Sightline to Quiescence: Multiwavelength Observations of the High Galactic Latitude Black Hole X-ray Binary Swift J1357.2-0933
• VLT spectroscopy of the Black Hole Candidate Swift J1357.2-0933 in Quiescence
• NuSTAR and XMM-Newton observations of the 2015 outburst decay of GX 339-4
• GRS 1739-278 observed at very low luminosity with XMM-Newton and NuSTAR

Cited by in corpus (4)

• The black hole X-ray transient Swift J1357.2-0933 as seen with Swift and NuSTAR during its 2017 outburst
• Puzzling Blue Dips in the Black Hole Candidate Swift J1357.2-0933, from ULTRACAM, SALT, ATCA, Swift and NuSTAR
• Implications on accretion flow dynamics from spectral study of Swift~J1357.2-0933
• Global Accretion Properties of Black Hole X-Ray Binaries: A Phenomenological Perspective