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X-Ray Determination of the Black-Hole Mass in Cygnus X-1

Published online by Cambridge University Press:  25 May 2016

A. Kubota ,
K. Makishima ,
T. Dotani ,
H. Inoue ,
K. Mitsuda ,
F. Nagase ,
H. Negoro ,
Y. Ueda ,
K. Ebisawa  and
S. Kitamoto
...Show all authors
A. Kubota
Affiliation:
Department of Physics, University of Tokyo 7-3-1, Hongo, Bunkyo-ku, Tokyo 113 JAPAN
K. Makishima
Affiliation:
Department of Physics, University of Tokyo 7-3-1, Hongo, Bunkyo-ku, Tokyo 113 JAPAN
T. Dotani
Affiliation:
Institute of Space and Astronautical Science, Sagamihara, Kanagawa 229, JAPAN
H. Inoue
Affiliation:
Institute of Space and Astronautical Science, Sagamihara, Kanagawa 229, JAPAN
K. Mitsuda
Affiliation:
Institute of Space and Astronautical Science, Sagamihara, Kanagawa 229, JAPAN
F. Nagase
Affiliation:
Institute of Space and Astronautical Science, Sagamihara, Kanagawa 229, JAPAN
H. Negoro
Affiliation:
Institute of Space and Astronautical Science, Sagamihara, Kanagawa 229, JAPAN
Y. Ueda
Affiliation:
Institute of Space and Astronautical Science, Sagamihara, Kanagawa 229, JAPAN
K. Ebisawa
Affiliation:
Universities Space Research Association, NASA/GSFC
S. Kitamoto
Affiliation:
Department of Earth and Space Science, Osaka Univ. Osaka 560, JAPAN
Y. Tanaka
Affiliation:
SRON-Utrecht, Sorbonnelaan 2, 3584 CA Utrecht, the Netherlands

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About 10 X-ray binaries in our Galaxy and LMC/SMC are considered to contain black hole candidates (BHCs). Among these objects, Cyg X-1 was identified as the first BHC, and it has led BHCs for more than 25 years(Oda 1977, Liang and Nolan 1984). It is a binary system composed of normal blue supergiant star and the X-ray emitting compact object. The orbital kinematics derived from optical observations indicates that the compact object is heavier than ~ 4.8 M⊙ (Herrero 1995), which well exceeds the upper limit mass for a neutron star(Kalogora 1996), where we assume the system consists of only two bodies. This has been the basis for BHC of Cyg X-1.

Type
Session 3: Diagnostics of High Gravity Objects with X- and Gamma Rays
Information
Symposium - International Astronomical Union , Volume 188: The Hot Universe , 1998 , pp. 388 - 389
Copyright
Copyright © Kluwer 1998 

References

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