Open AccessCHARACTERIZING THE TIME-FREQUENCY PROPERTIES OF THE 4 Hz QUASI-PERIODIC OSCILLATION AROUND THE BLACK HOLE X-ray BINARY XTE J1550-564
Author(s) -
Yi-Hao Su,
Yi Chou,
ChinPing Hu,
Ting-Chang Yang,
Hung-En Hsieh,
Po-Sheng Chuang,
Ching-Ping Lin,
Nai-Hui Liao
Publication year - 2015
Publication title -
publications of the korean astronomical society
Language(s) - English
Resource type - Journals
eISSN - 2287-6936
pISSN - 1225-1534
DOI - 10.5303/pkas.2015.30.2.587
Subject(s) - oscillation (cell signaling) , physics , precession , astrophysics , binary number , spectral line , black hole (networking) , signal (programming language) , quasi periodic , distribution (mathematics) , quantum mechanics , mathematical analysis , mathematics , chemistry , computer network , biochemistry , routing protocol , arithmetic , routing (electronic design automation) , computer science , link state routing protocol , programming language
We present the results from analysis of the Hilbert-Huang transform (HHT) for the 4 Hz quasi-periodic oscillations (QPO) around the black hole X-ray binary XTE J1550-564. The resultant Hilbert spectra demonstrate that the QPO is composed of a series of intermittent signals appearing occasionally. From the analysis of the HHT, we further found the distribution of the lifetimes for the intermittent oscillations and the distribution for the time intervals with no significant signal (the break time). The mean lifetime is 1.45 s and 90% of the oscillation segments have lifetimes less than 3.1 s whereas the mean break time is 0.42 s and 90% of break times are less than 0.73 s. We conclude that the intermittent feature of the QPO could be explained by the Lense-Thirring precession model and rules out interpretations of continual frequency modulation.
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