kHz QPO pairs expose the neutron star of Circinus X-1

Details kHz QPO pairs expose the neutron star of Circinus X-1 kHz QPO pairs expose the neutron star of Circinus X-1

2007-01-23

arxiv.org/abs/astro-ph/0701660v2

Astronomy and Astrophysics

Astrophysics

3 pages, 2 figures - one from astro-ph/0608089 (ApJ 653, 1435, 2006) in corrected form, to appear in the proceedings of the 11

Scientific paper

We discovered kHz QPOs in 80 archived RXTE observations from the peculiar low-mass X-ray binary (LMXB) Circinus X-1. In 11 cases these appear in pairs in the frequency range of ~230 Hz to ~500 Hz for the upper kHz QPO and ~56 Hz to ~225 Hz for the lower kHz QPO. Their correlation with each other, which is similar to that of frequencies of kHz QPO pairs in other LMXBs containing a neutron star, and their variation by a factor two confirm that the central object is a neutron star. These are the lowest frequencies of kHz QPO pairs discovered so far and extend the above correlation over a frequency range of factor four. In this new frequency range the frequency difference of the two kHz QPOs increases monotonically by more than ~170 Hz with increasing kHz QPO frequency, challenging theoretical models.

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