ASCA Observations of the Iron Line Structure in Cygnus X-1

Details ASCA Observations of the Iron Line Structure in Cygnus X-1 ASCA Observations of the Iron Line Structure in Cygnus X-1

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...467..419e&link_type=abstract

Astrophysical Journal v.467, p.419

Astronomy and Astrophysics

Astronomy

125

Accretion, Accretion Disks, Stars: Individual Constellation Name: Cygnus X-1, Stars: Emission-Line, Be, X-Rays: Stars

Scientific paper

The black hole candidate Cyg X-1 was observed with the ASCA satellite on multiple occasions in 1993 and 1994 for a total exposure of about 7 days. The energy resolution of the ASCA SIS (ΔE/E ≍ 2% at 6 keV) allows the spectral structure in the iron K band to be studied in greater detail than before. We detected an iron emission line at 6.4 keV in almost all the data with an intrinsic line width of ≤ 0.2 keV (1 σ) and an equivalent width of 10-30 eV. The line parameters show no clear orbital phase dependence. A broad edge feature was observed at E ≥ 7 keV in all the spectra. Both the narrow iron emission-line and broad edge features are consistent with disk reflection from the outer parts of an ionized accretion disk where the most populous iron ion species is Fe XI.

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