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ASCA Observation of the Superluminal Jet Source GRO J1655-40 in the 1997 OutburstWe report on the results of an ASCA observation of the Galactic jet source GRO 51655-40 performed from 1997 February 25 to February 28 covering a full orbital period (2.62 d). The averaged 2-10 keV flux was about 1.1 Crab. An absorption line feature centered at 6.8 keV was detected both in the GIS and SIS spectra. We interpret this as a blend of two resonance-absorption K alpha lines from H-like and He-like iron ions. We can consistently explain both the ASCA spectra and the simultaneous RXTE/PCA spectrum by a combination of K-absorption lines and K-absorption edges of iron ions. The fact that the absorption line is stably present over the whole orbital phase implies that the distribution of the highly ionized plasma is not affected by the companion star, which is consistent with its presence around the black hole. A curve of growth analysis shows that the plasma contains velocity dispersion along the line-of-sight larger than 300 km/s attributed to bulk motions. It is probably a part of a geometrically thick accretion flow in turbulent motions with velocities of 500-1600 km/s at an estimated radius of sim 10(exp 10)/cm.
Document ID
20040073167
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Yamaoka, Kazutaka
(Institute of Space and Astronautical Science Sagamihara, Japan)
Ueda, Yoshihiro
(Institute of Space and Astronautical Science Sagamihara, Japan)
Hajime, Inoue
(Institute of Space and Astronautical Science Sagamihara, Japan)
Nagase, Fumiski
(Institute of Space and Astronautical Science Sagamihara, Japan)
Ebisawa, Ken
(Institute of Space and Astronautical Science Sagamihara, Japan)
Kotani, Taro
(Institute of Space and Astronautical Science Sagamihara, Japan)
Tanaka, Yasuo
(Institute of Space and Astronautical Science Sagamihara, Japan)
Zhang, Shang Nan
(Institute of Space and Astronautical Science Sagamihara, Japan)
Date Acquired
August 21, 2013
Publication Date
April 1, 2001
Publication Information
Publication: Publications of the Astronomical Society of Japan
Publisher: Astronomical Society of Japan
Volume: 53
Issue: 2
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: NAG5-7927
Distribution Limits
Public
Copyright
Other

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