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- W2904338035 abstract "We present a high resolution X-ray spectrum of the accreting X-ray pulsar, OAO 1657--415 with HETG+ACIS-S onboard emph{Chandra},revealing the presence of a broad line component around $sim$ 6.3 keV associated with the neutral iron K$_alpha$ line at 6.4 rm{keV}. This is interpreted as Compton shoulder arising from the Compton scattering of the 6.4 rm{keV} fluorescence photons making OAO 1657--415 the second accreting neutron star where such a feature is detected. A Compton shoulder reveals the presence of dense matter surrounding the X-ray source. We did not detect any periodicity in the lightcurve and obtained an upper limit of $sim$ 2% for the pulse fraction during this observation. This could be due to the smearing of the pulses when X-ray photons are scattered from a large region around the neutron star. In addition to the Fe K$_alpha$, Fe $K_beta$ and Ni $K_alpha$ lines already reported for this source, we also report for the first time, the presence of He-like and H-like iron emission lines at 6.7 and 6.97 rm{keV} in the first order HETG spectrum. The detection of such ionized lines, indicative of a highly ionized surrounding medium, is rare in X-ray binaries." @default.
- W2904338035 created "2018-12-22" @default.
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- W2904338035 date "2019-01-15" @default.
- W2904338035 modified "2023-09-24" @default.
- W2904338035 title "Multitude of iron lines including a Compton-scattered component in OAO 1657 – 415 detected with<i>Chandra</i>" @default.
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- W2904338035 doi "https://doi.org/10.1093/mnras/sty3441" @default.
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