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The Galactic Black Hole Transient H1743-322 During Outburst Decay Connections Between Timing Noise, State Transitions, And Radio EmissionMultiwavelength observations of Galactic black hole transients during outburst decay are instrumental for our understanding of the accretion geometry and the formation of outflows around black hole systems. H1743-322, a black hole transient observed intensely in X-rays and also covered in the radio band during its 2003 decay, provides clues about the changes in accretion geometry during state transitions and also the general properties of X-ray emission during the intermediate and low-hard states. In this work, we report on the evolution of spectral and temporal properties in X-rays and the flux in the radio band, with the goal of understanding the nature of state transitions observed in this source. We concentrate on the transition from the thermal dominant state to the intermediate state that occurs on a timescale of 1 day. We show that the state transition is associated with a sudden increase in power-law flux. We determine that the ratio of the power-law flux to the overall flux in the 3-25 keV band must exceed 0.6 for us to observe strong timing noise. Even after the state transition, once this ratio was below 0.6, the system transited back to the thermal dominant state for 1 day. We show that the emission from the compact radio core does not turn on during the transition from the thermal dominant state to the intermediate state but does turn on when the source reaches the low-hard state, as seen in 4U 1543-47 and GX 339-4. We find that the photon index correlates strongly with the QPO frequency and anticorrelates with the rms amplitude of variability. We also show that the variability is more likely to be associated with the power-law emission than the disk emission.
Document ID
20060022515
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Kalemci, E.
(California Univ. Berkeley, CA, United States)
Tomsick, J. A.
(California Univ., San Diego La Jolla, CA, United States)
Corbel
(Centre National de la Recherche Scientifique Gif-sur-Yvette, France)
Kaaret, P.
(Iowa Univ. Iowa City, IA, United States)
Rothschild, R. E.
(California Univ., San Diego La Jolla, CA, United States)
Pottschmidt, K.
(California Univ., San Diego La Jolla, CA, United States)
Date Acquired
August 23, 2013
Publication Date
March 1, 2006
Publication Information
Publication: The Astrophysical Journal
Volume: 639
Subject Category
Astrophysics
Funding Number(s)
CONTRACT_GRANT: NNG04GB19B
CONTRACT_GRANT: NAG5-13142
CONTRACT_GRANT: NAS5-30720
Distribution Limits
Public
Copyright
Other

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