Abstract Details
| Name: Sagnick Mukherjee Affiliation: Presidency University, Kolkata Conference ID: ASI2019_66 Title : THE ACCRETION DISK-JET CONNECTION IN BLAZARS Authors and Co-Authors : Sagnick Mukherjee (Presidency University, Kolkata), Kaustav Mitra (Presidency University, Kolkata), Dr. Ritaban Chatterjee (Presidency University, Kolkata). Abstract Type : Oral Abstract Category : Extragalactic Astronomy Abstract : The power spectral density (PSD) of the X-ray emission variability from the accretion disk-corona region of black hole X-ray binaries and active galactic nuclei has a broken power-law shape with a characteristic break timescale. If the disk and the jet are connected, the jet variability may also contain a characteristic timescale related to that of the disk-corona. Recent observations of the blazar Mrk 421 have confirmed the broken power-law shape of the PSD of its jet X-ray variability. We model the time variability of a blazar, in which emitting particles are assumed to be accelerated by successive shock waves flowing down the jet with a varying inter-shock timescale. We find that the PSD of the variability has a characteristic timescale connected to the average inter-shock timescale. We investigate the possible relation between the break timescale in the disk and jet variability based on the above model, along with mathematically and physically simulated disk variability. We simulate disk light curves based on a broken power-law shaped PSD and use its dips as times of shock launching down the jet. We show that the break timescale of the jet PSD is independent of the break timescale of the disk PSD. We conclude that both the PSD of the jet and that of the disk variability may have a broken power-law shape but the break timescales are not related. The break in the jet and disk PSD are connected to the interval between large amplitude outbursts in the jet and to the viscous timescale in the disk, respectively. In frequency bands where multiple emission processes are involved or emission is from lower energy particles, the break in the PSD may not be prominent enough for detection. This work has been submitted to MNRAS and is undergoing the refereeing process now. |