Detection of a Fully-resolved Compton Shoulder of the Iron K-alpha Line in the Chandra X-ray Spectrum of GX 301-2

2); 2) ((1) ISAS; (2) University of Tokyo; (3) Caltech; 4); (4) Chandra Postdoctoral Fellow; (5) Tokyo Metropolitan University; (6) Stanford University; (7) Kogakuin University; (8) Columbia University)

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Detection of a Fully-resolved Compton Shoulder of the Iron K-alpha Line in the Chandra X-ray Spectrum of GX 301-2

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arxiv astro-ph/0309344 v1 pith:U6HOHF53 submitted 2003-09-12 astro-ph

Shin Watanabe (1 , 2) , Masao Sako (3 , 4) , Manabu Ishida (5) , Yoshitaka Ishisaki (5) , Steve M. Kahn (6) , Takayoshi Kohmura (7)

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Umeyo Morita (5) Fumiaki Nagase (1) Frederik Paerels (8) Tadayuki Takahashi (1 2) ((1) ISAS (2) University of Tokyo (3) Caltech (4) Chandra Postdoctoral Fellow (5) Tokyo Metropolitan University (6) Stanford University (7) Kogakuin University (8) Columbia University)

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We report the detection of a fully-resolved, Compton-scattered emission line in the X-ray spectrum of the massive binary GX 301-2 obtained with the High Energy Transmission Grating Spectrometer onboard the Chandra X-ray Observatory. The iron K-alpha fluorescence line complex observed in this system consists of an intense narrow component centered at an energy of E = 6.40 keV and a redward shoulder that extends down to ~6.24 keV, which corresponds to an energy shift of a Compton back-scattered iron K-alpha photon. From detailed Monte Carlo simulations and comparisons with the observed spectra, we are able to directly constrain the physical properties of the scattering medium, including the electron temperature and column density, as well as an estimate for the metal abundance.

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