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http://hdl.handle.net/2445/99391
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DC Field | Value | Language |
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dc.contributor.author | Migliari, Simone | - |
dc.contributor.author | Van der Klis, M. | - |
dc.contributor.author | Fender, R. P. | - |
dc.date.accessioned | 2016-06-09T13:30:37Z | - |
dc.date.available | 2016-06-09T13:30:37Z | - |
dc.date.issued | 2003-11 | - |
dc.identifier.issn | 0035-8711 | - |
dc.identifier.uri | http://hdl.handle.net/2445/99391 | - |
dc.description.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 Δν= 274 +/- 11 Hz, significantly smaller than the constant value of Δν~ 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. | - |
dc.format.extent | 1 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Royal Astronomical Society | - |
dc.relation.isformatof | Reproducció del document publicat a: http://dx.doi.org/10.1046/j.1365-8711.2003.07186.x | - |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society, 2003, vol. 345, num. 3, p. L35-L39 | - |
dc.relation.uri | http://dx.doi.org/10.1046/j.1365-8711.2003.07186.x | - |
dc.rights | (c) Migliari, Simone et al., 2003 | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Estels de neutrons | - |
dc.subject.classification | Estels | - |
dc.subject.classification | Astronomia de raigs X | - |
dc.subject.other | Neutron stars | - |
dc.subject.other | Stars | - |
dc.subject.other | X-ray astronomy | - |
dc.title | Evidence of a decrease of kHz quasi-periodic oscillation peak separation towards low frequencies in 4U 1728-34 (GX 354-0) | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 634034 | - |
dc.date.updated | 2016-06-09T13:30:42Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
Files in This Item:
File | Description | Size | Format | |
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634034.pdf | 297.7 kB | Adobe PDF | View/Open |
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