2002MNRAS.335..865M

We have simultaneously fitted Chandra and RXTE spectra of the Galactic black hole XTE J1118+480 with three models for X-ray reflection. We explored a range of accretion disc ionizations (log ξ= 1-4;ξ=L_X/ nR ² ) and iron abundances (0.10-1.00). Our fits with the constant-density ionized disc models of Ross & Fabian indicate that ≤0.5 per cent (90 per cent confidence upper limit) of the observed flux is reflected. Fits with the pexrav model of Magdziarz & Zdziarski indicate that the two-dimensional solid angle (Ω/2π) subtended by the disc relative to a central source of incident hard X-rays is 0.01 ^+0.06_–0.01. A combination of the high inclination (i = 81°), Comptonization, and bulk velocities may contribute to the low reflection fractions we have measured. The results are also consistent with extended jets being the source of the hard X-ray flux, as the disc would then represent a small solid angle as seen from the emission region.