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Quasi-periodic oscillations in XTE J1550−564: the rms-flux relation.
- Source :
- Monthly Notices of the Royal Astronomical Society: Letters; Feb2011, Vol. 411 Issue 1, pL66-L70, 5p, 3 Graphs
- Publication Year :
- 2011
-
Abstract
- We present an analysis of the short time-scale variations in the properties of the strong (type 'C') quasi-periodic oscillation (QPO) observed in XTE J1550−564 during its 1998 outburst. In particular, the QPO shows a correlation between absolute rms amplitude and mean source flux over time-scales shorter than ks. A linear rms-flux relation has been observed to be a common property of broad-band noise, but here we report the first detection of rms-flux dependence in a QPO. The gradient of the rms-flux relation is correlated with the QPO peak frequency: from a strong positive correlation when the QPO peak frequency is below Hz, through no correlation, to a strong negative correlation when the peak frequency is above Hz. This is the first time a negative short term rms-flux relation has been observed in any component of the power spectrum. Previous work on both the broad-band noise and QPOs in a range of sources have suggested the presence of a filter reducing the amplitude of QPOs with increasing frequency. We attempt to remove the possible effects of this filter and find that the previously negative rms-flux relations above Hz become constant. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 17453925
- Volume :
- 411
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Monthly Notices of the Royal Astronomical Society: Letters
- Publication Type :
- Academic Journal
- Accession number :
- 57367603
- Full Text :
- https://doi.org/10.1111/j.1745-3933.2010.00997.x