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

  • A. Kubota (a1), K. Makishima (a1), T. Dotani (a2), H. Inoue (a2), K. Mitsuda (a2), F. Nagase (a2), H. Negoro (a2), Y. Ueda (a2), K. Ebisawa (a3), S. Kitamoto (a4) and Y. Tanaka (a5)...

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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.

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References

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Dotani, et al. ApJL Vol. 485 in press
Oda, M. 1977, Space Sci. Rev. 20, 757
Liang, E. P. and Nolan, P. L. 1984, Space Sci. Rev. 38, 353
Herrero, A., Kudritzki, R. P., Gabler, R., Vilchez, J. M., Gabler, A. 1995, AAP 297, 556
Kalogera, V. and Baym, G. 1996, ApJL 470, L61
Tanaka, Y., and Lewin, W. H. G. 1995, X-Ray Binaries , eds. Lewin, W. H. G., van Paradijs, J. & van den Heuvel, W. P. J., (Cambridge University Press), 126
Makishima, K., Maejima, Y., Mitsuda, K. et al. 1986, PASJ 308, 635
Mitsuda, K., Inoue, H., Koyama, K. et al. 1984, PASJ 36, 741
Hanawa, T. 1989, ApJ 341, 948
Ebisawa, K., Mitsuda, K., Hanawa, T. 1991, ApJ 367, 213

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

  • A. Kubota (a1), K. Makishima (a1), T. Dotani (a2), H. Inoue (a2), K. Mitsuda (a2), F. Nagase (a2), H. Negoro (a2), Y. Ueda (a2), K. Ebisawa (a3), S. Kitamoto (a4) and Y. Tanaka (a5)...

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