"Hiccup" accretion in the swinging pulsar IGR J18245-2452

Understand

IGR J18245-2452 is the fifteenth discovered accreting millisecond X-ray pulsar and the first source of this class showing direct evidence for transition between accretion and rotational powered emission states.

• These swing provided the strongest confirmation of the pulsar recycling scenario available so far.
• During the two XMM-Newton observations that were carried out while the source was in outburst in April 2013, IGR J18245-2452 displayed a unique and peculiar variability of its X-ray emission.
• In this work, we report on a detailed analysis of the XMM- Newton data and focus in particular on the timing and spectral variability of the source.