Energy dependence of kilohertz quasi-periodic oscillations
Abstract
Kilohertz quasi-periodic oscillations (kHz QPOs) are the fastest variability features from the low mass X-ray binaries (LMXBs) originally discovered in 1996 with Rossi X-ray Timing Explorer (RXTE). Most of the Z sources as well as several atoll sources have shown this timing feature. The physical origin of the kHz QPOs is still unknown, although many theoretical models are available in the literature. The energy dependence of rms amplitude from the kHz QPOs could be a potentially important tool to understand the spectral origin of this timing feature. We have studied this energy dependence in details for a large number kHz QPOs from a neutron star LMXB. We have also done simulations to test basic models. Here we will present the observed results and the simulations as well as the basic implications of the results. We will briefly mention the role of ASTROSAT in this regard.
- Publication:
-
39th COSPAR Scientific Assembly
- Pub Date:
- July 2012
- Bibcode:
- 2012cosp...39.1289M