X-Ray and Near-Infrared Observations of GX 339-4 in the Low/Hard State with Suzaku and IRSF

Abstract

X-ray and near-infrared ($J$-$H$-$K_{\mathrm{s}}$) observations of the Galactic black hole binary GX 339--4 in the low/hard state were performed with Suzaku and IRSF in 2009 March. The spectrum in the 0.5--300 keV band is dominated by thermal Comptonization of multicolor disk photons, with a small contribution from a direct disk component, indicating that the inner disk is almost fully covered by hot corona with an electron temperature of $\approx$175 keV. The Comptonizing corona has at least two optical depths, $\tau \approx 1,0.4$. Analysis of the iron-K line profile yields an inner disk radius of $(13.3_{-6.0}^{+6.4})R_{\mathrm{g}}$ ($R_{\mathrm{g}}$ represents the gravitational radius $GM/c^2$), with the best-fit inclination angle of $\approx 50^{\circ }$. This radius is consistent with that estimated from the continuum fit by assuming the conservation of photon numbers in Comptonization. Our results suggest that the standard disk of GX 339--4 is likely truncated before reaching the innermost stable circular orbit (for a non rotating black hole) in the low/hard state at $\sim$1% of the Eddington luminosity. The one-day averaged near-infrared light curves are found to be correlated with hard X-ray flux with $F_{\mathrm{Ks}}\propto F_{\mathrm{X}}^{0.45}$. The flatter near infrared $\nu F_{\nu }$ spectrum than the radio one suggests that the optically thin synchrotron radiation from the compact jets dominates the near-infrared flux. Based on a simple analysis, we estimate the magnetic field and size of the jet base to be $5\times 10^4$ G and $6\times 10^8$ cm, respectively. The synchrotron self Compton component is estimated to be approximately 0.4% of the total X-ray flux.

arXiv comment17pages, 15 figures, accepted for publication in PASJ (Suzaku and MAXI Special Issue)

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