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29 March 2024
 
  » arxiv » astro-ph/0111027

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Extremely Weak Reflection Features in the X-ray Spectrum of XTE J1118+480: Possible Evidence for X-ray-Emitting Jets?
J. M. Miller ; D. R. Ballantyne ; A. C. Fabian ; W. H. G. Lewin ;
Date 1 Nov 2001
Journal Mon.Not.Roy.Astron.Soc. 335 (2002) 865
Subject astro-ph
AffiliationMIT CSR), D. R. Ballantyne (IoA Cambridge Univ.), A. C. Fabian (IoA Cambridge Univ.), W. H. G. Lewin (MIT CSR
AbstractWe have simultaneously fit 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(xi)=1-4; xi=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 less than 0.5 per cent (90 per cent confidence upper-limit) of the observed flux is reflected. Fits with the "pexrav" of model Magdziarz & Zdziarski indicate that the two-dimensional solid angle (Omega/2pi) 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 degrees), Comptonization, and bulk velocities may each 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.
Source arXiv, astro-ph/0111027
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