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Millihertz Oscillation Frequency Drift Predicts the Occurrence of Type I X-ray Bursts
D. Altamirano, M. van der Klis, R. Wijnands +1
Millihertz quasi-periodic oscillations reported in three neutron-star low mass X-ray binaries have been suggested to be a mode of marginally stable nuclear burning on the neutron s…
Intermittent millisecond X-ray pulsations from the neutron-star X-ray transient SAX J1748.9-2021 in the globular cluster NGC 6440
D. Altamirano, P. Casella, A. Patruno +2
We report on intermittent X-ray pulsations with a frequency of 442.36 Hz from the neutron-star X-ray binary SAX J1748.9--2021 in the globular cluster NGC 6440. The pulsations were…
kHz QPO pairs expose the neutron star of Circinus X-1
S. Boutloukos, M. van der Klis, D. Altamirano +2
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 ~23…