Abstract
We present observations of the 1997 outburst of the X-ray transient GS 1354-64 (BW Cir) at X-ray, optical and, for the first time, radio wavelengths. The X-ray outburst was unusual in that the source remained in the low/hard X-ray state throughout; the X-ray peak was also preceded by at least one optical outburst, suggesting that it was an ‘outside-in’ outburst — similar to those observed in dwarf novae systems, although possibly taking place on a viscous timescale in this case. It therefore indicates that the optical emission was not dominated by the reprocessing of X-rays but that instead we see the instability directly. While the radio source was too faint to detect any extended structure, spectral analysis of the radio data and a comparison with other similar systems suggests that mass ejections, probably in the form of a jet, took place and that the emitted synchrotron spectrum may have extended as far as infrared wavelengths. Finally, we compare this 1997 outburst of GS 1354-64 with possible previous outbursts and also with other hard state objects, both transient and persistent. It appears that a set of characteristics — such as a weak, flat spectrum radio jet, a mHz QPO increasing in frequency, a surprisingly high optical:X-ray luminosity ratio and the observed optical peak preceding the X-ray peak — may be common to all hard state X-ray transients.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Brocksopp, C., Jonker, P.G., Fender, R.P., Groot, P.J., Van der Klis, M. and Tingay, S.J.: 2000, Mon. Not. R. Astron. Soc, in press.
Charles, P.A.: 1998, in: M. Abramowicz, G. Bjornsson and J. Pringle (eds.), Theory of Black Hole Accretion Disks, Cambridge University Press.
Kitamoto, S., Tsunemi, H., Pedersen, H., Ilovaisky, S.A., Van der Klis, M.: 1990, Astrophys. J. 361, 590.
Tanaka, Y. and Lewin, W.H.G.: 1995, in: W.H.G. Lewin, J. Van Paradijs and E. van den Heuvel (eds.), X-ray Binaries, Cambridge University Press, p. 126.
Van der Klis, M.: 1994, Astron. Astrophys. 283, 469.
Van der Klis, M.: 1995, in: W.H.G. Lewin, J. Van Paradijs and E. van den Heuvel, E. (eds.), X-Ray Binaries, Cambridge University Press, p. 252.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2001 Springer Science+Business Media New York
About this paper
Cite this paper
Brocksopp, C., Jonker, P., Fender, R., Van Der Klis, M., Groot, P., Tingay, S. (2001). The 1997 Hard State Outburst of the X-Ray Transient GS 1354-64/BW Cir. In: Castro-Tirado, A.J., Greiner, J., Paredes, J.M. (eds) Microquasars. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0700-9_30
Download citation
DOI: https://doi.org/10.1007/978-94-010-0700-9_30
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-3828-7
Online ISBN: 978-94-010-0700-9
eBook Packages: Springer Book Archive