Loading...
Please wait, while we are loading the content...
Similar Documents
Evidence of a decrease of kHz quasi-periodic oscillation peak separation towards low frequencies in 4 U 1728 – 34 ( GX 354 – 0 )
| Content Provider | Semantic Scholar |
|---|---|
| Author | Migliari, Simone Klis, Michiel Van Der Fender, Robert P. |
| Copyright Year | 2003 |
| Abstract | We have produced the colour–colour diagram of all the observations of 4U 1728–34 available in the Rossi X-ray Timing Explorer public archive (from 1996 to 2002) and found observations filling in a previously reported ‘gap’ between the island and the banana X-ray states. We have made timing analysis of these gap observations and found, in one observation, two simultaneous kHz quasi-periodic oscillations (QPOs). The timing parameters of these kHz QPOs fit in the overall trend of the source. The ‘lower’ kHz QPO has a centroid frequency of ∼308 Hz. This is the lowest ‘lower’ kHz QPO frequency ever observed in 4U 1728–34. The peak frequency separation between the ‘upper’ and the ‘lower’ kHz QPO is ν = 274 ± 11 Hz, significantly smaller than the constant value of ν ∼ 350 Hz found when the ‘lower’ kHz QPO frequency is between ∼500 and 800 Hz. This is the first indication in this source for a significant decrease of kHz QPO peak separation towards low frequencies. We compare the result briefly to theoretical models for kHz QPO production. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://pure.uva.nl/ws/files/3477186/26213_klis23evidence.pdf |
| Alternate Webpage(s) | http://diposit.ub.edu/dspace/bitstream/2445/99391/1/634034.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Archive Diagram Familial Mediterranean Fever Hertz (Hz) Kilohertz Quasiperiodicity Small Static timing analysis |
| Content Type | Text |
| Resource Type | Article |
