Spectroscopy of Cyg X-1 the High State with HETG/Chandra

Details Spectroscopy of Cyg X-1 the High State with HETG/Chandra Spectroscopy of Cyg X-1 the High State with HETG/Chandra

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.5702f&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #57.02; Bulletin of the American Astronomical Society, Vol. 34, p.1206

Astronomy and Astrophysics

Astronomy

Scientific paper

Cyg X-1 was observed in the high state around orbital phase 0 with HETG/Chandra. Significant absorption lines of highly ionized species were detected, such as Fe XXV, Fe XXIV, Fe XXIII, S XIV, S XVI, Ne X, etc. The observed absorption lines are found to be blue-shifted (z ~ -0.002) from those observed in the low and transition states. In the high state each absorption line was composed of a blue-shifted absorption line and a un-shifted absorption line which similar to that observed in the low state. The broad line feature of Fe Kα at 6.4 keV was detected with a significance of Δ χ2 ~ 40, although precise measurements are hindered by uncertainties in the calibration. The implications of these results on the configuration of the accretion flow of Cyg X-1 in the high state are discussed.

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