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KiloHertz Quasi-Periodic Oscillations in the Z sources GX 340+0, Cygnus X-2, GX 17+2, GX 5-1, and Scorpius X-1 | | Rudy Wijnands & Michiel van der Klis
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15 Dec 1997 | | Subject: | astro-ph | | Abstract: | We have discovered kiloHertz quasi-periodic oscillations (kHz QPOs) in five Z sources: GX 340+0, Cygnus X-2, GX 17+2, GX 5-1, and Scorpius X-1. In all sources the properties of these kHz QPOs are very similar and closely related to the position of the sources on the Z track traced out in the X-ray color-color diagram and the hardness-intensity diagram. The frequencies of the kHz QPOs increase when the sources move from the left end of the horizontal branch to horizontal/normal branch vertex, thus with inferred mass accretion rate. Only for Scorpius X-1 the kHz QPOs have been observed down the normal branch unto the flaring branch. The strength and the FWHM of the higher-frequency kHz QPOs decrease with mass accretion rate, but when the lower-frequency kHz QPOs are detected the strength and the FWHM of this QPO stay approximately constant with mass accretion rate. In Scorpius X-1 the frequency separation between the kHz QPOs decreases with mass accretion rate, but in the other Z sources the separation remains approximately constant, although a similar decrease in peak separation as found in Scorpius X-1 can not be excluded. | | Source: | arXiv, astro-ph/9712186 | | Services: | Forum | Review | PDF | Favorites | |
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