Leahy, D. A.,
Matsuoka, M.,
Kawai, N.,
Makino, F..
言語
English
掲載誌/書名
和文:
英文:
Monthly Notices of the Royal Astronomical Society
巻, 号, ページ
Vol. 237
pp. 269-276
出版年月
1989年3月
出版者
和文:
英文:
会議名称
和文:
英文:
開催地
和文:
英文:
アブストラクト
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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