2009/04/17 by K. Sriram, Kandulapati Sriram, V. K. Agrawal +3 · 1 citation
Physics and Astronomy · #Accretion (finance) #Accretion disc #Active galactic nucleus #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Intermediate polar #Thick disk #Thin disk #astro-ph.GA #astro-ph.HE
paper · pdf · doi:10.1088/1674-4527/9/8/006
12 pages, 6 figures. accepted for the publicatin in RAA
arxiv created 2009/04/17 · openalex publication_date 2009/07/24 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
To investigate the geometry of the accretion disk in the source H1743–322, we have carried out a detailed X-ray temporal and spectral study using RXTE pointed observations. We have selected all data pertaining to the Steep Power Law (SPL) state during the 2003 outburst of this source. We find anti-correlated hard X-ray lags in three of the observations and the changes in the spectral and timing parameters (like the QPO frequency) confirm the idea of a truncated accretion disk in this source. Compiling data from similar observations of other sources, we find a correlation between the fractional change in the QPO frequency and the observed delay. We suggest that these observations indicate a definite size scale in the inner accretion disk (the radius of the truncated disk) and we explain the observed correlation using various disk parameters like Compton cooling time scale, viscous time scale etc.