Dr. Emrah Kalemci (Sabanci)

University of Florida Astronomy Colloquium - Feb. 4th, 2015

Galactic black hole transients during outburst decays; formation of compact jets and jet / X-ray timing relation

Our group characterizes multiwavelength evolution of Galactic black hole transients during their outburst decays using simultaneous X-ray (RXTE, Swift, and INTEGRAL), optical/infrared (SMARTS, Faulkes) 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. Moreover, we also investigate 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 flux generation and 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.