The 2nd PANDA Symposium on Multimessager Astronomy - Jets and Shocks in the Universe

Evolution of characteristic time scales during the outbursts of the black hole transient GX 339-4

25 Apr 2013, 17:35

5m

Xi'an

Poster

Speaker

Mr Sheng-Ming(圣明) Zheng(郑) (Shanghai Astronomical Observatory)

Description

We report the power density spectral evolution of GX 339-4 during the rising phase of four outbursts in 2002-2010. In order to probe the change in accretion geometry, we study the characteristic frequencies in the power spectra. Our results demonstrate quite uniform evolutional pattern for low frequency quasi-periodic oscillations, especially with the fact that the four cases differ great in the outburst magnitude. While for band-limited noises, larger scattering exists. Both sorts of power spectral components show significant relative rate-of-change on the timescale of one day, e.g., as much as 50 percent or more in some cases. We think that these phenomena may reflect properties of non-stationary accretion flow, which does not support either the SSD or the ADAF regime.