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Title: Quasi-periodic oscillations in XTE J0111.2-7317: Highest frequency among the HMXB pulsars
Authors: Kaur, Ramanpreet
Paul, Biswajit
Raichur, Harsha
Sagar, R.
Keywords: Stars: Binaries: General
Stars: Pulsars: Individual: Alphanumeric: XTE J0111.2-7317
Stars: Neutron, X-Rays: Binaries
X-rays: individual (XTE J0111.2-7317)
X-Rays: Stars
Issue Date: 10-May-2007
Publisher: The American Astronomical Society
Citation: Astrophysical Journal, 2007, Vol.660, p1409-1412
Abstract: We report the discovery of quasi-periodic oscillations (QPOs) in the high-mass X-ray binary (HMXB) pulsar XTE J0111.2-7317 during a transient outburst of the source in 1998 December. Using observations made with the Proportional Counter Array of the Rossi X-Ray Timing Explorer during the second peak and the declining phase of the outburst, we have discovered a QPO feature at a frequency of 1.27 Hz. We have ruled out the possibility that the observed feature could instead be from the neighboring bright X-ray pulsar SMC X-1. This is the highest frequency QPO ever detected in an HMXB pulsar. In the absence of a cyclotron absorption feature in the X-ray spectrum, the QPO, along with the pulse period and X-ray flux measurement, helps us to constrain the magnetic field strength of the neutron star.
Description: Restricted Access. An open-access version is available at Articles older than 2 years are open to all at the journal site (alternative location)
ISSN: 0004-637X
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Copyright: 2007 American Astronomical Society
Appears in Collections:Research Papers (A&A)

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