Aquila X-1 from outburst to quiescence: the onset of the propeller effect and signs of an awaken rotation powered pulsar

Details Aquila X-1 from outburst to quiescence: the onset of the propeller effect and signs of an awaken rotation powered pulsar Aquila X-1 from outburst to quiescence: the onset of the propeller effect and signs of an awaken rotation powered pulsar

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nuphs..69..204c&link_type=abstract

Nuclear Physics B Proceedings Supplements, Volume 69, Issue 1-3, p. 204-209.

Physics

Nuclear Physics

Scientific paper

According to current evolutionary scenarios, neutron stars in Low Mass X-Ray Binaries (LMXRBs) are spun-up by accretion torques to limiting periods in the millisecond range and give rise to ``recycled'' millisecond radio pulsars once accretion stops1-3. In addition to persistent sources, the X-ray sky is populated by a number of transient sources. Among them, Soft X-Ray Transients (SXRTs), when in outburst, show properties similar to those of LMXRBs4-6. SXRTs are characterised by luminosities, and therefore mass accretion rates, that vary over many decades: while it is clear that when in outburst their emission is powered by accretion onto the neutron star surface, the origin of the low-level emission detected during quiescence remained uncertain7,8. Here we report on BeppoSAX pointed observations of Aql X-1, the first to follow the decay of a SXRT outburst down to quiescence. The fast X-ray flux decay that leads to quiescence is most readily interpreted in terms of the propeller effect arising from the very fast rotation of the neutron star magnetosphere. The hard X-ray spectrum that characterises the quiescent emission is probably due to shock emission powered by a turned-on radio pulsar.

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