Quasi periodic oscillations in XTE J0111.2--7317, highest frequency among the HMXB pulsars

Abstract

We report here discovery of Quasi Periodic Oscillations (QPOs) in the High Mass X-ray Binary (HMXB) Pulsar XTE J0111.20-7317 during a transient outburst in this source in December 1998. Using observations made with the proportional counter array of the Rossi X-ray Timing Explorer during the second peak and the declining phase of this outburst we have discovered a QPO feature at a frequency of 1.27 Hz. We have ruled out the possibility that the observed QPOs can instead be from the neighbouring bright X-ray pulsar SMC X-1. This is the highest frequency QPO feature ever detected in any HMXB pulsar. In the absence of a cyclotron absorption feature in the X-ray spectrum, the QPO feature, along with the pulse period and X-ray flux measurement measurement helps us to constrain the magnetic field strength of the neutron star.

Accepted for publication in The Astrophysical Journal

References in corpus (2)

• BeppoSAX observations of the accretion-powered X-ray pulsar SMC X-1
• Variable Quasi Periodic Oscillations during an outburst of the transient X-ray pulsar XTE J1858+034

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