skip to main content

Title: Alternating lags of QPO harmonics: A generic model and its application to the 67 mHz QPO of GRS 1915+105

A generic model for alternating lags in quasi-periodic oscillation (QPO) harmonics is presented where variations in the photon spectrum are caused by oscillations in two parameters that characterize the spectrum. It is further assumed that variations in one of the parameters are linearly driven by variations in the other after a time delay t{sub d} . It is shown that alternating lags will be observed for a range of t{sub d} values. A phenomenological model based on this generic one is developed that can explain the amplitude and phase lag variation with energy of the fundamental and the next three harmonics of the 67 mHz QPO observed in GRS 1915+105. The phenomenological model also predicts the variation of the Bicoherence phase with energy, which can be checked by further analysis of the observational data.
Authors:
 [1] ;  [2]
  1. Inter-University Center for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune-411007 (India)
  2. Department of Physics, Taki Government College, Taki, North 24 Parganas-743429, West Bengal (India)
Publication Date:
OSTI Identifier:
22348491
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 779; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; AMPLITUDES; BLACK HOLES; COMPUTERIZED SIMULATION; DATA; HARMONICS; MHZ RANGE; PERIODICITY; PHOTONS; SPECTRA; STARS; TIME DELAY