التفاصيل البيبلوغرافية
| العنوان: |
Suzaku Discovery of Absorption Lines from the Black Hole Transient 4U1630-472 |
| المؤلفون: |
Kubota, Aya, Dotani, Tadayasu, Cottam, Jean, Kotani, Taro, Done, Chris, Ueda, Yoshihiro, Fabian, Andy C., Yasuda, Tomonori, Takahashi, Hiromitsu, Fukazawa, Yasushi, Yamaoka, Kazutaka, Makishima, Kazuo, Yamada, Shinya, Kohmura, Takayoshi, Angelini, Lorella, Team, the Suzaku |
| المصدر: |
Progress of Theoretical Physics Supplement; 20130517, Vol. 169 Issue: 0 p225-225, 1p |
| مستخلص: |
We present the results of six Suzaku observations of the recurrent black hole transient 4U 1630-472 during its decline from its most recent outburst in 2006. All observations show the typical high/soft state spectral shape in the 2–50 keV band, roughly described by an optically thick disk spectrum in the soft energy band plus a weak power-law tail. The disk temperature decreases from 1.4 keV to 1.2 keV as the flux decreases by a factor 2, consistent with a constant radius as expected for disk-dominated spectra. All the observations reveal significant absorption lines from highly ionized (H-like and He-like) iron Kα at 7.0 keV and 6.7 keV. The energies of these absorption lines suggest a blue shift with an outflow velocity of ∼1000 km s−1. The H-like iron Kα equivalent width remains approximately constant at ∼30 eV over all the observations, while that of the He-like Kα line increases from 7 eV to 20 eV. Thus the ionization state of the material decreases, as expected from the decline in flux. The data constrain the velocity dispersion of the absorber to 200–2000 km s−1, and the size of the plasma as ∼1010 cm assuming a source distance of 10 kpc. |
| قاعدة البيانات: |
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