"Soft X-ray transient" outbursts which aren't soft

Abstract

We have accumulated multiwavelength (X-ray, optical, radio) lightcurves for the eight black hole X-ray binaries which have been observed to enter a supposed `soft X-ray transient' outburst, but remained in the low/hard state throughout the outburst. Comparison of the lightcurve morphologies, spectral behaviour, properties of the quasi-periodic oscillations and the radio jet provides the first study of such objects as a sub-class of X-ray transients. However rather than assuming that these hard state X-ray transients are different from the `canonical' soft X-ray transient, we prefer to consider the possibility that new analysis of both soft and hard state X-ray transients in a spectral context will provide a model capable of explaining the outburst mechanisms of (almost) all black hole X-ray binaries.

Accepted for publication in New Astronomy

References in corpus (4)

• Radio / X-ray correlation in the low/hard state of GX 339--4
• Large-Scale, Decelerating, Relativistic X-ray Jets from the Microquasar XTE J1550-654
• Exploring the Role of Jets in the Radio/X-ray Correlations of GX339-4
• Correlated X-ray and optical variability in KV UMa

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