Three new VLA radio upper limits on Aql X-1 at X-ray luminosities below 3e35 erg/s, combined with archival detections, steepen the inferred radio-X-ray correlation slope to beta = 1.17 (+0.30/-0.21), or imply a radio cutoff near LX = 5e35 erg/s.
A decade of transitional millisecond pulsars
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abstract
Transitional millisecond pulsars (tMSPs), which are systems that harbor a pulsar in the throes of the recycling process, have emerged as a new source class since the discovery of the first such system a decade ago. These systems switch between accretion-powered low-mass X-ray binary (LMXB) and rotation-powered radio millisecond pulsar (RMSP) states, and provide exciting avenues to understand the physical processes that spin-up neutron stars to millisecond periods. During the last decade, three tMSPs, as well as a candidate source, have been extensively probed using systematic, multi-wavelength campaigns. Here we review the observational highlights from these campaigns and our general understanding of tMSPs.
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Quasi-simultaneous radio and X-ray observations of Aql X-1: probing low luminosities
Three new VLA radio upper limits on Aql X-1 at X-ray luminosities below 3e35 erg/s, combined with archival detections, steepen the inferred radio-X-ray correlation slope to beta = 1.17 (+0.30/-0.21), or imply a radio cutoff near LX = 5e35 erg/s.