Relativistic reflection and reverberation in GX 339-4 with NICER and NuSTAR

Abstract

We analyze seven NICER and NuSTAR epochs of the black hole X-ray binary GX 339-4 in the hard state during its two most recent hard-only outbursts in 2017 and 2019. These observations cover the 1-100 keV unabsorbed luminosities between 0.3% and 2.1% of the Eddington limit. With NICER's negligible pile-up, high count rate and unprecedented time resolution, we perform a spectral-timing analysis and spectral modeling using relativistic and distant reflection models. Our spectral fitting shows that as the inner disk radius moves inwards, the thermal disk emission increases in flux and temperature, the disk becomes more highly ionized and the reflection fraction increases. This coincides with the inner disk increasing its radiative efficiency around ~1% Eddington. We see a hint of hysteresis effect at ~0.3% of Eddington: the inner radius is significantly truncated during the rise ($>49R_g$), while only a mild truncation ($\sim 5R_g$) is found during the decay. At higher frequencies ($2-7$~Hz) in the highest luminosity epoch, a soft lag is present, whose energy dependence reveals a thermal reverberation lag, with an amplitude similar to previous findings for this source. We also discuss the plausibility of the hysteresis effect and the debate of the disk truncation problem in the hard state.

17 pages, 9 figures, accepted for publication in ApJ

References in corpus (18)

• X-ray Properties of Black-Hole Binaries
• Modelling the behaviour of accretion flows in X-ray binaries
• X-ray reverberation around accreting black holes
• The corona contracts in a black-hole transient
• A Long, Hard Look at the Low-Hard State in Accreting Black Holes
• A systematic look at the Very High and Low/Hard state of GX 339-4: Constraining the black hole spin with a new reflection model
• Discovery of multiple Lorentzian components in the X-ray timing properties of the Narrow Line Seyfert 1 Ark 564
• A public relativistic transfer function model for X-ray reverberation mapping of accreting black holes
• The mass function of GX 339-4 from spectroscopic observations of its donor star
• Broadband X-ray Spectra of GX 339-4 and the Geometry of Accreting Black Holes in the Hard State
• High Density Reflection Spectroscopy I. A case study of GX~339-4
• Self-Consistent Black Hole Accretion Spectral Models and the Forgotten Role of Coronal Comptonization of Reflection Emission
• Evolution of the reverberation lag in GX 339-4 at the end of an outburst
• The role of the disk magnetization on the hysteresis behavior of X-ray binaries
• A unified accretion-ejection paradigm for black hole X-ray binaries. IV. Replication of the 2010--2011 activity cycle of GX 339-4
• The 2017 Failed Outburst of GX 339-4: Relativistic X-ray Reflection near the Black Hole Revealed by NuSTAR and Swift Spectroscopy
• An X-ray reverberation mass measurement of Cygnus X-1
• Accretion and ejection in black-hole X-ray transients

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• Evidence of mutually exclusive outflow forms from a black hole X-ray binary
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