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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
; | | Date: |
18 Dec 2003 | | Subject: | astro-ph | | Affiliation: | SSL/UCB), J. A. Tomsick (CASS/UCSD), R. E. Rothschild (CASS/UCSD), K. Pottschmidt (MPE/ISDC), P. Kaaret (CFA | | 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. | | Source: | arXiv, astro-ph/0312465 | | Services: | Forum | Review | PDF | Favorites | |
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