Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-12
Astrophys.J.597:L37-L40,2003
Astronomy and Astrophysics
Astrophysics
13 pages, 4 figures, 1 table, accepted for publication in ApJ Letter
Scientific paper
10.1086/379735
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.
Ishida Manabu
Ishisaki Yoshitaka
Kahn Steve M.
Kohmura Takayoshi
Morita Umeyo
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