High-frequency oscillations from Cir X-1
Open Access
- 1 June 1987
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 226 (4) , 971-978
- https://doi.org/10.1093/mnras/226.4.971
Abstract
We report results from an EXOSAT observation of Cir X-1 during which strong, low-frequency (5–20 Hz) quasi-periodic oscillations (QPO) were detected. QPO were also detected at much higher frequencies (100–200 Hz). These high frequencies are consistent with rotation periods in the inner accretion disc region. High-frequency QPO lend weight to the idea that the low-frequency QPO peak is due to a beating between a pulsar and disc rotation frequencies. Coherent pulsations from the neutron star have not been observed.Keywords
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