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GRO J1655-40: Early Stages of the 2005 Outburst

hal.structure.identifierNASA Goddard Space Flight Center [GSFC]
dc.contributor.authorSHAPOSHNIKOV, N.
hal.structure.identifierNASA Goddard Space Flight Center [GSFC]
dc.contributor.authorSWANK, J.
hal.structure.identifierNASA Goddard Space Flight Center [GSFC]
dc.contributor.authorSHRADER, C. R.
hal.structure.identifierNational Optical Astronomy Observatory [NOAO]
dc.contributor.authorRUPEN, M.
hal.structure.identifierNASA Goddard Space Flight Center [GSFC]
dc.contributor.authorBECKMANN, V.
hal.structure.identifierNASA Goddard Space Flight Center [GSFC]
dc.contributor.authorMARKWARDT, C. B.
hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorSMITH, D. A.
dc.date.issued2007-01
dc.identifier.issn0004-637X
dc.description.abstractEnThe black hole X-ray binary transient GRO J1655-40 underwent an outburst beginning in early 2005. We present the results of our multiwavelength observational campaign to study the early outburst spectral and temporal evolution, which combines data from X-ray (RXTE and INTEGRAL), radio (VLA), and optical (ROTSE and 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 broadband 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 cutoff 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 not 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.language.isoen
dc.publisherAmerican Astronomical Society
dc.subject.enAccretion
dc.subject.enAccretion Disks
dc.subject.enBlack Hole Physics
dc.subject.enGamma Rays: Observations
dc.subject.enStars: Individual: Alphanumeric: GRO J1655-40
dc.title.enGRO J1655-40: Early Stages of the 2005 Outburst
dc.typeArticle de revue
dc.identifier.doi10.1086/509755
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Phénomènes cosmiques de haute energie [astro-ph.HE]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Phénomènes cosmiques de haute energie [astro-ph.HE]
dc.identifier.arxivastro-ph/0609757
bordeaux.journalThe Astrophysical Journal
bordeaux.page434-446
bordeaux.volume655
bordeaux.peerReviewedoui
hal.identifierhal-00728383
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00728383v1
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