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Author
D. Altamirano
A. Ingram
M. van der Klis
R. Wijnands
M. Linares
J. Homan
Year
2012
Title
Low-frequency quasi-periodic oscillation from the 11 Hz accreting pulsar in Terzan 5: not frame dragging
Journal
Astrophysical Journal Letters
Volume | Issue number
759 | 1
Pages (from-to)
L20
Number of pages
5
Document type
Article
Faculty
Faculty of Science (FNWI)
Institute
Anton Pannekoek Institute for Astronomy (API)
Abstract
We report on six RXTE observations taken during the 2010 outburst of the 11 Hz accreting pulsar IGR J17480-2446 located in the globular cluster Terzan 5. During these observations we find power spectra which resemble those seen in Z-type high-luminosity neutron star low-mass X-ray binaries, with a quasi-periodic oscillation (QPO) in the 35-50 Hz range simultaneous with a kHz QPO and broadband noise. Using well-known frequency-frequency correlations, we identify the 35-50 Hz QPOs as the horizontal branch oscillations, which were previously suggested to be due to Lense-Thirring (LT) precession. As IGR J17480-2446 spins more than an order of magnitude more slowly than any of the other neutron stars where these QPOs were found, this QPO cannot be explained by frame dragging. By extension, this casts doubt on the LT precession model for other low-frequency QPOs in neutron stars and perhaps even black hole systems.
URL
go to publisher's site
Language
English
Permalink
http://hdl.handle.net/11245/1.381891

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