LOW-FREQUENCY QUASI-PERIODIC OSCILLATION FROM THE 11 Hz ACCRETING PULSAR IN TERZAN 5: NOT FRAME DRAGGING
Author(s)
Altamirano, D.; Ingram, A.; van der Klis, M.; Wijnands, R.; Linares Alegret, Manuel; Homan, Jeroen; ... Show more Show less
DownloadAltamirano-2012-LOW-FREQUENCY QUASI-.pdf (1.997Mb)
PUBLISHER_POLICY
Publisher Policy
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Terms of use
Metadata
Show full item recordAbstract
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.
Date issued
2012-10Department
MIT Kavli Institute for Astrophysics and Space ResearchJournal
Astrophysical Journal. Letters
Publisher
IOP Publishing
Citation
Altamirano, D., A. Ingram, M. van der Klis, R. Wijnands, M. Linares, and J. Homan. “LOW-FREQUENCY QUASI-PERIODIC OSCILLATION FROM THE 11 Hz ACCRETING PULSAR IN TERZAN 5: NOT FRAME DRAGGING.” The Astrophysical Journal 759, no. 1 (October 16, 2012): L20. © 2012 The American Astronomical Society
Version: Final published version
ISSN
2041-8205
2041-8213