FNWI --- IMAPP Department of Astrophysics
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news:fast_multi-wavelength_broad-band_and_qpo_variability_in_a_black_hole_x-ray_binary._acrretion_flow_and_or_a_jet_origin [2015/08/26 13:22] (current)
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 +Tuesday 1st September 4:00pm
 +**Fast multi-wavelength broad-band and QPO variability in a black hole X-ray binary: acrretion flow and/or a jet origin?**
 +**Dr. Maithili Kalamkar**, Post doctoral researcher, National Institute for Astrophysics (INAF), Roma Astronomical Observatory,​ Italy.
 +Fast variability in X-ray binaries has been studied for many decades, which is associated with accretion flows (in X-rays) and recently confirmed from jets (at least in the infra-red band). I will present results of observations of a black hole X-ray binary in hard state with simultaneous coverage in X-ray, optical and infra-red bands. A Quasi Periodic Oscillation (QPO) is detected for the first time in the infra-red band. Interestingly,​ the QPO is also detected in optical and the frequency in both these bands is half the frequency of the QPO in X-rays (classified as type-C) in the broad 0.3-60 keV range. The infra-red power spectrum also exhibits broad-band noise similar to the X-ray power spectrum and is correlated. Hence, we see strong correlated variability in the emission from the accretion flow and the jet. With the known origin of X-ray variability in accretion flows, I will discuss if this can manifest itself in jets providing a mechanism for jet variability.