Abstract Details
| Name: Mubashir Hamid Mir Affiliation: University of Kashmir Conference ID: ASI2016_693 Title : Model for the enigmatic energy-dependent time lags and rms of the heartbeat oscillations in GRS 1915-105 Authors and Co-Authors : Ranjeev Misra (IUCAA, PUne), Mayukh Pahari (IUCAA, Pune) , Naseer Iqbal (K.U, Srinagar), Naveel A. Wani (K.U, Srinagar) Abstract Type : Poster Abstract Category : Extragalactic astronomy Abstract : We report the discovery and modeling of enigmatic energy-dependent time lags of the order of few sec in the heartbeat state of GRS 1915-105. The lags for the fundamental show turn around ~10 keV while for harmonic they keep rising to at leat 10 keV. We have proposed the model based on the delayed response of the inner disk (DRIOD) radius to the accretion rate. The fluctuating accretion rate drives the oscillations of the inner disk after a time delay while the power-law respond immediately. We show that in this combined (diskbb+powerlaw) model based on the (DRIOD), a pure sinusoidal oscillation of the accretion rate explains not only the energy dependent rms and time-lag spectra of fundamental but also that for next harmonic with just four free parameters. Thus the lags of few secs which cannot be attributed to time travel effects or Comptonization delays can be explained by delays in the spectral components. |