The early phase of a H1743-322 outburst observed by INTEGRAL, RXTE, Swift, and XMM/Newton

Abstract

We investigate the early phase of the first state change during the 2008 September-November outburst of H1743-322, first detected by the INTEGRAL satellite. We analyse INTEGRAL, RXTE, Swift, and XMM/Newton observations, which provide coverage of the quiescence to outburst evolution in the 3-200 keV range every few days. The energy spectra are well fitted by a phenomenological model consisting of an exponentially cut-off power law plus a disc component. A more physical model of thermal Comptonisation (and a disc) represents the spectra equally well. In a first phase (up to MJD 54760), the photon index and temperature of the disc do not vary significantly, and have values reminiscent of the Hard State (HS). The timing analysis is also consistent with that of a HS, and shows in particular a rather high degree of variability (~30%), and a strong ~0.5-1 Hz QPO with its first harmonic. The timing and spectral characteristics of H1743-322 are similar to those of the first HS during its 2003 outburst. After MJD 54760, a change to softer spectra and a ~5-6 Hz QPO indicate that the source underwent a state transition into a Hard-Intermediate State (HIMS). We observe in both states a correlation between the QPO frequency and the photon index, which indicates a strong link between the accretion disc, generally understood to determine the QPO frequency, and the corona, which determines the QPO power. The gradual disappearance of the QPO harmonic, and the slowly decreasing hard X-ray flux, imply that the accretion disc gradually moved inwards during the HS.

arXiv comment4 pages, 4 figures, Letter to the Editor accepted for publication in A&A

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• Following the 2008 outburst decay of the black hole candidate H1743-322 in X-ray and radio
• Evolution of the temporal and the spectral properties in 2010 and 2011 outbursts of H 1743-322
• On the outburst evolution of H1743-322: a 2008/2009 comparison
• Relations between X-ray timing features and spectral parameters of Galactic black hole X-ray binaries
• INTEGRAL: science highlights and future prospects
• The INTEGRAL view on Black Hole X-ray Binaries
• The 2018 outburst of BHXB H1743-322 as seen with MeerKAT
• The radio/X-ray correlation in X-ray binaries - Insights from a hard X-ray perspective
• Correlations between radio and bolometric fluxes in GX 339-4 and H1743-322
• Delayed Outburst of H 1743--322 in 2003 and relation with its other outbursts
• Discovery and evolution of the new black hole candidate Swift J1539.2-6227 during its 2008 outburst
• A microquasar classification from a disk instability perspective
• Infrared study of H1743-322 in outburst: a radio-quiet and NIR-dim microquasar
• Phase-resolved spectral analysis of the 11 millihertz quasi-periodic oscillation in the black-hole candidate H1743-322