TENMA observations of iron line emission from GX301-2

Details TENMA observations of iron line emission from GX301-2 TENMA observations of iron line emission from GX301-2

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.237..269l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 237, March 15, 1989, p. 269-276. Research supported by

Astronomy and Astrophysics

Astronomy

18

Emission Spectra, Iron, Line Spectra, X Ray Binaries, Curve Fitting, Pulsars, Spectrum Analysis, X Ray Fluorescence, X Ray Spectra

Scientific paper

X-ray observations of GX301-2 with Tenma are reported. The spectrum shows a strong fluorescent iron line and a strong absorption feature at the iron K-edge energy. The average energy of the iron line and of the K-edge are 6.46 (0.05 error) and 7.36 (0.05) keV. The equivalent width of the iron line varies from 200 eV to 1.8 keV, while the column density varies from 2 x 10 to the 23rd to 1.8 x 10 to the 24th/sq cm. Two effects are discovered which have never been detected before in X-ray binaries: (1) the iron line and K-edge energies correspond to different ionization states, and (2) the energy of the iron line depends on the column density to the neutron star. The first implies that the gas along the line-of-sight is cooler than the bulk of the X-ray irradiated gas; the second indicates that density is the controlling factor of ionization.

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