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Optical, ultraviolet and X-ray analysis of the black hole candidate BG Geminorum

Published online by Cambridge University Press:  01 August 2006

P. Elebert ,
P. J. Callanan ,
L. Russell  and
S. E. Shaw
P. Elebert
Affiliation:
Department of Physics, University College Cork, Ireland email: [email protected]
P. J. Callanan
Affiliation:
Department of Physics, University College Cork, Ireland email: [email protected]
L. Russell
Affiliation:
Department of Physics, University College Cork, Ireland email: [email protected]
S. E. Shaw
Affiliation:
School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK
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Abstract

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We present the first high resolution optical spectrum of the black hole candidate BG Geminorum, as well as UV spectroscopy from the Hubble Space Telescope, and X-ray data from INTEGRAL. The UV spectra suggest the presence of material in BG Gem with velocities possibly as high as ∼1000 km s−1, suggesting an origin at a distance of ∼0.7 R⊙ from a 3.5 M⊙ object; if real, this would be strong evidence that the primary in BG Gem is indeed a black hole. In contrast, the upper limit provided by the INTEGRAL data gives a maximum X-ray luminosity of only ∼0.1 of the Eddington luminosity.

Keywords

X-rays: binariesaccretion discsstars: individual (BG Geminorum).
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. 361 - 362
Copyright
Copyright © International Astronomical Union 2007

References

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