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Black hole transients during outburst decays, compact jets and X-ray timing

Event Details

Event Dates: 

Friday, October 31, 2014 - 12:00pm

Seminar Location: 

  • CASA Conference Room C324

Speaker Name(s): 

Emrah Kalemci

Speaker Affiliation(s): 

Sabanci University
Seminar Type/Subject

Scientific Seminar Type: 

  • Astrophysics Lunch Seminar

Event Details & Abstract: 

Our group characterizes the multiwavelength evolution of Galactic black hole transients during their outburst decays using simultaneous X-ray (RXTE, Swift, and INTEGRAL), optical/infrared (SMARTS) and radio (VLA, ATCA, VLBI). By characterizing the X-ray spectral and timing evolution of these systems, and merging this information with the evolution in the near-infrared and radio, we obtain the conditions necessary to launch stable compact jets, and how jets can be influencing and/or influenced by X-ray timing and spectral properties of these systems. A couple of highlights from this study are the strict threshold for the accretion disk luminosity to launch a compact jet, jet launch timescales much larger than numerical studies anticipate and a relation between the strength of X-ray timing and the position of the source in the radio-X-ray luminosity relation tracks. We explain jet formation timescales through magnetic field transport timescales in a thick disk, and our results support (at least partially) findings of Malzac 2014 that relates short term variability induced internal shocks powering the radio to infrared emission coming from the compact jet.

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