Resolving the Cygnus X-3 iron K line

Details Resolving the Cygnus X-3 iron K line Resolving the Cygnus X-3 iron K line

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46l.105k&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan, vol. 46, no. 3, p. L105-L108

Astronomy and Astrophysics

Astrophysics

22

Emission Spectra, X Ray Binaries, X Ray Sources, X Ray Stars, Infrared Spectroscopy, X Ray Spectra

Scientific paper

An Advanced Satellite for Cosmology and Astrophysics (ASCA) observation of Cygnus X-3 on 1993 June 11, in its X-ray high intensity state, has for the first time resolved the broad iron K line emission into three components: a He-like line at 6.67 +/- 0.01 keV, a H-like line at 6.96 +/- 0.02 keV, and a neutral line at 6.37 +/- 0.03 keV. The line intensities of the 6.67 keV and 6.96 keV lines are modulated with the 4.8 hr orbital period and are maximum when the continuum intensity is minimum. There is a sharp minimum of the line intensity on the rising phase of the continuum intensity. An iron absorption edge is observed at 7.19 +/- 0.02 keV. The optical depth of the absorption edge varies from 0.3 to 0.5 and is in anti-phase with the overall X-ray continuum modulation. The observed complexity of the iron K line region is greater than that had been assumed in previous spectral modeling based on observations with lower resolution detectors.

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