Figure 7 - uploaded by Arka Chatterjee
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A comparative diagram of time lag and QPO frequency correlation is drawn for three sources during the rising phases of the outbursts. Each of the sources follows a particular trend. Interestingly, GX 339-4 and XTE J1550-564 followed similar patterns where the time lag decreased with increasing QPO frequency. On the contrary, the time lag initially decreased for XTE J1650-500 up to ν c ∼ 3.0 Hz and afterwards increased with increasing QPO frequency.
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Evolution of variability properties of Galactic transient sources is a diagnostic tool to understand various regimes of the accretion flow and its dynamics close to the central black hole. In this paper, we concentrate on the variability properties of the X-ray transient XTE J1650-500 and investigate the evolution of viscous delay, time lag, QPO fr...
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Context 1
... to the size of the Compton cloud. Thus, the increment in QPO frequency is always expected when the Compton cloud's size is reduced as the object evolves to a softer state. The shrinking in Compton cloud reduces the delay due to Compton scattering (see Miyamoto et al. (1988)). This is what we observe in the case of GX 339-4 and XTE J1550-564 (see Fig. 7). Monte-Carlo simulations ( Chatterjee et al. 2017b) in the presence of Comptonization (Pozdnyakov, Sobol & Sunyaev 1983), disc reflection and gravitational bending of photons (Chatterjee, Chakrabarti & Ghosh 2017a;Chatterjee et al. 2018) showed a direct anti-correlation with the size of the Compton cloud as seen in case of GX ...
Context 2
... to the size of the Compton cloud. Thus, the increment in QPO frequency is always expected when the Compton cloud's size is reduced as the object evolves to a softer state. The shrinking in Compton cloud reduces the delay due to Compton scattering (see Miyamoto et al. (1988)). This is what we observe in the case of GX 339-4 and XTE J1550-564 (see Fig. 7). Monte-Carlo simulations ( Chatterjee et al. 2017b) in the presence of Comptonization (Pozdnyakov, Sobol & Sunyaev 1983), disk reflection and gravitational bending of photons (Chatterjee, Chakrabarti & Ghosh 2017a;Chatterjee et al. 2018) showed a direct anti-correlation with the size of the Compton cloud as seen in case of GX ...
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