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Suzaku observation of the black hole transient 4U1630–472: discovery of absorption lines

Published online by Cambridge University Press:  01 August 2006

Aya Kubota ,
Tadayasu Dotani ,
Jean Cottam ,
Taro Kotani ,
Chris Done ,
Yoshihiro Ueda ,
Andy C. Fabian ,
Tomonori Yasuda ,
Hiromitsu Takahashi  and
Yasushi Fukazawa
...Show all authors
Aya Kubota
Affiliation:
Inst. of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako, Saitama 351-0198 email: [email protected]
Tadayasu Dotani
Affiliation:
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510
Jean Cottam
Affiliation:
Exploration of the Universe Div., NASA GSFC, Greenbelt, MD 20771, USA
Taro Kotani
Affiliation:
Department of Physics, Tokyo Tech, 2-12-1 O-okayama, Meguro, Tokyo 152-8551, Japan
Chris Done
Affiliation:
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510 Department of Physics, University of Durham, South Road, Durham, DH1 3LE, UK
Yoshihiro Ueda
Affiliation:
Department of Astronomy, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
Andy C. Fabian
Affiliation:
Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
Tomonori Yasuda
Affiliation:
Department of Physics, Hiroshima Univ., Higashi-Hiroshima, Hiroshima 739-8526
Hiromitsu Takahashi
Affiliation:
Department of Physics, Hiroshima Univ., Higashi-Hiroshima, Hiroshima 739-8526
Yasushi Fukazawa
Affiliation:
Department of Physics, Hiroshima Univ., Higashi-Hiroshima, Hiroshima 739-8526
Kazutaka Yamaoka
Affiliation:
Department of Physics, Aoyama Gakuin University, Sagamihara, Kanagawa 229-8558, Japan
Kazuo Makishima
Affiliation:
Inst. of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako, Saitama 351-0198 email: [email protected] Department of Physics, Univ. of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
Shinya Yamada
Affiliation:
Department of Physics, Univ. of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
Takayoshi Kohmura
Affiliation:
Physics Department, Kogakuin University 2665-1, Nakano-cho, Hachioji, Tokyo, 192-0015
Lorella Angelini
Affiliation:
Exploration of the Universe Div., NASA GSFC, Greenbelt, MD 20771, USA
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Abstract

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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.

Keywords

Black hole physics – absorption lines
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S238: Black Holes from Stars to Galaxies – Across the Range of Masses , August 2006 , pp. 23 - 28
Copyright
Copyright © International Astronomical Union 2007

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