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kHz QPO pairs expose the neutron star of Circinus X-1 | | S. Boutloukos
; M. van der Klis
; D. Altamirano
; M. Klein-Wolt
; R. Wijnands
; | | Date: |
23 Jan 2007 | | Abstract: | We discovered kHz QPOs in 80 archived RXTE observations from the peculiar low mass X-ray binary Circinus X-1. In 11 cases, those appear in pairs and have frequencies of the order of several hundred Hz that vary in frequency over a factor 2. This and the fact that they follow the relation followed by observations from other neutron stars as well as that they appear simultaneously confirm that the central object is a neutron star. These relations are extended to lower frequencies as also is the one of the frequency difference against the frequency of the upper kHz QPO. The monotonic increase of the latter challenges theoretical models of kHz QPOs. | | Source: | arXiv, astro-ph/0701660 | | Services: | Forum | Review | PDF | Favorites | |
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