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 arXiv.org. Articles older than 2 years are open to all at the journal site (alternative location)
URI:	http://hdl.handle.net/2289/2710
ISSN:	0004-637X 1538-4357(Online)
Alternative Location:	http://adsabs.harvard.edu/cgi-bin/bib_query?2007ApJ...660.1409K http://arxiv.org/abs/astro-ph/0703205 http://dx.doi.org/10.1086/513418
Copyright:	2007 American Astronomical Society
Appears in Collections:	Research Papers (A&A)

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