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Hysteresis of spectral evolution in the soft state of black-hole binary LMC X-3
David M. Smith, David M. Dawson, Jean H. Swank
We report the discovery of hysteresis between the x-ray spectrum and luminosity of black-hole binary LMC X-3. Our observations, with the Proportional Counter Array on the Rossi X-r…
XTE J1739-302 as a Supergiant Fast X-ray Transient
D. M. Smith, W. A. Heindl, C. B. Markwardt +4
XTE J1739-302 is a transient X-ray source with unusually short outbursts, lasting on the order of hours. Here we give a summary of X-ray observations we have made of this object in…
An exceptionally bright flare from SGR1806-20 and the origins of short-duration gamma-ray bursts
K. Hurley, S. E. Boggs, D. M. Smith +17
Soft-gamma-ray repeaters (SGRs) are galactic X-ray stars that emit numerous short-duration (about 0.1 s) bursts of hard X-rays during sporadic active periods. They are thought to b…