The discovery of low-level iron line emission from CYG X-1

Details The discovery of low-level iron line emission from CYG X-1 The discovery of low-level iron line emission from CYG X-1

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ssrv...40..383b&link_type=abstract

(ESA, ESLAB Symposium on X-Ray Astronomy in the EXOSAT Era, 18th, The Hague, Netherlands, Nov. 5-9, 1984) Space Science Reviews

Astronomy and Astrophysics

Astronomy

1

Astronomical Spectroscopy, Emission Spectra, Iron, Line Spectra, X Ray Binaries, Exosat Satellite, Fluorescence, Spectrum Analysis

Scientific paper

Exosat GSPC measurements of the 2-24 keV spectrum of Cyg X-1 are reported which reveal the presence of an iron emission feature in its spectrum. The iron line is broader (FWHM 1.3 keV) than the detector resolution (0.7 keV). There is some evidence for variability in the line (between 0.7 and 2.1 keV) and equivalent width, (88 to 145 eV), at the 3-sigma level, while the line strength varies between 4.3 x 10 to the -3rd and 1.2 x 10 to the -2nd photons per sq cm s. However, there is no dependence of these parameters on the phase of the 5.6-day period. The energy of the line centroid is effectively constant at 6.5 keV.

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