2007年1月
Suzaku discovery of iron absorption lines in outburst spectra of the X-ray transient 4U 1630-472
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
- 巻
- 59
- 号
- 開始ページ
- S185
- 終了ページ
- S198
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1093/pasj/59.sp1.S185
- 出版者・発行元
- OXFORD UNIV PRESS
We present the results of six Suzaku observations of the recurrent black hole transient 4U 1630-472 during its decline from outburst from February 8 to March 23 in 2006. All observations show the typical high/soft state spectral shape in the 2-50keV band, roughly described by an optically thick-disk spectrum in the soft energy band plus a weak power-law tail that becomes dominant only above similar to 20 keV. The disk temperature decreases from 1.4 keV to 1.2 keV as the flux decreases by a factor of 2, consistent with a constant radius, as expected for disk-dominated spectra. All of the observations reveal significant absorption lines from highly ionized (H-like and He-like) iron K alpha's at 7.0 keV and 6.7 keV. The energies of these absorption lines suggest a blue shift with an outflow velocity of similar to 1000 km s(-1). The H-like iron K alpha equivalent width remains approximately constant at similar to 30 eV over all of the observations, while that of the He-like Ka line increases from 7 eV to 20 eV. Thus, the ionization state of the material decreases, as expected from the decline in flux. By fitting the profile with Voigt functions (curve of growth) together with detailed photo-ionization calculations, the total absorbing column, and the ionization parameter were estimated to be (1.0-0.7) x 10(23) cm(-2) and (6-4) x 10(4), respectively, for a velocity dispersion of 500 km s(-1). This in turn constrains the size of the plasma to be similar to 10(10) cm, assuming a source distance of 10 kpc.
- リンク情報
- ID情報
-
- DOI : 10.1093/pasj/59.sp1.S185
- ISSN : 0004-6264
- eISSN : 2053-051X
- Web of Science ID : WOS:000244441700014