GRO J1655-40: Early Stages of the 2005 Outburst

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dc.creatorShaposhnikov, N.
dc.creatorSwank, J.
dc.creatorShrader, C. R.
dc.creatorRupen, M.
dc.creatorBeckmann, V.
dc.creatorMarkwardt, C. B.
dc.creatorSmith, D. A.
dc.date2006-09-27
dc.date.accessioned2026-07-07T10:40:17Z
dc.date.available2026-07-07T10:40:17Z
dc.descriptionThe black-hole X-ray binary transient GRO J1655-40 underwent an outburst beginning in early 2005. We present the results of our multi-wavelength observational campaign to study the early outburst spectral and temporal evolution, which combines data from X-ray (RXTE, INTEGRAL), radio (VLA) and optical (ROTSE, SMARTS) instruments. During the reported period the source left quiescence and went through four major accreting black hole states: low-hard, hard intermediate, soft intermediate and high-soft. We investigated dipping behavior in the RXTE band and compare our results to the 1996-1997 case, when the source was predominantly in the high-soft state, finding significant differences. We consider the evolution of the low frequency quasi-periodic oscillations and find that the frequency strongly correlates with the spectral characteristics, before shutting off prior to the transition to the high-soft state. We model the broad-band high-energy spectrum in the context of empirical models, as well as more physically motivated thermal and bulk-motion Comptonization and Compton reflection models. RXTE and INTEGRAL data together support a statistically significant high energy cut-off in the energy spectrum at 100~200 keV during the low-hard state. The RXTE data alone also show it very significantly during the transition, but cannot see one in the high-soft state spectra. We consider radio, optical and X-ray connections in the context of possible synchrotron and synchrotron self-Compton origins of X-ray emission in low-hard and intermediate states. In this outburst of GRO J1655-40, the radio flux does not rise strongly with the X-ray flux.
dc.description23 pages, 16 figures, accepted for publication in ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/0609757
dc.identifierhttp://arxiv.org/abs/astro-ph/0609757
dc.identifierAstrophys.J.655:434-446,2007
dc.identifierdoi:10.1086/509755
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181295
dc.subjectAstrophysics
dc.titleGRO J1655-40: Early Stages of the 2005 Outburst
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