Transitions of black hole transients to the low/hard state under the microscope

E. Kalemci; J. A. Tomsick; R. E. Rothschild; K. Pottschmidt; P. Kaaret

doi:10.1063/1.1780999

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Transitions of black hole transients to the low/hard state under the microscope

E. Kalemci·J. A. Tomsick·R. E. Rothschild·K. Pottschmidt·P. Kaaret

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Abstract

We characterized the evolution of spectral and temporal properties of several Galactic black hole transients observed between 1996-2001 using the data from well sampled PCA observations close to the transition to the low/hard state. We showed that the changes in temporal properties are much sharper than the changes in the spectral properties, and it is much easier to identify a state transition with the temporal properties. The ratio of the power-law flux to the total flux in the 3-25 keV band increases close to the transition, and the power-law flux shows a sharp increase along with the changes in temporal properties during the transitions. In this work we concentrate on the decay of two recent outbursts, from 4U 1543$-$47, and H1743$-$322 and discuss the state transitions by tracking their daily, and sometimes hourly evolution, and interpret results based on the expectations from our earlier observations.

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E. Kalemci, J. A. Tomsick, R. E. Rothschild, K. Pottschmidt, P. Kaaret. 2003-12-17. Transitions of black hole transients to the low/hard state under the microscope. https://doi.org/10.1063/1.1780999

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