Detection of X-ray emission from a bright long-period radio transient.
Nature (2025)
Abstract:
Recently, a class of long-period radio transients (LPTs) has been discovered, exhibiting emission thousands of times longer than radio pulsars1-5. These findings, enabled by advances in wide-field radio surveys, challenge existing models of rotationally powered pulsars. Proposed models include highly magnetized neutron stars6, white-dwarf pulsars7 and white-dwarf binary systems with low-mass companions8. Although some models predict X-ray emission6,9, no LPTs have been detected in X-rays despite extensive searches1-5,10. Here we report the discovery of an extremely bright LPT (10-20 Jy in radio), ASKAP J1832-0911, which has coincident radio and X-ray emission, both with a 44.2-minute period. Its correlated and highly variable X-ray and radio luminosities, combined with other observational properties, are unlike any known Galactic object. The source could be an old magnetar or an ultra-magnetized white dwarf; however, both interpretations present theoretical challenges. This X-ray detection from an LPT reveals that these objects are more energetic than previously thought and establishes a class of hour-scale periodic X-ray transients with a luminosity of about 1033 erg s-1 linked to exceptionally bright coherent radio emission.A Coherent Radio Burst from an X-Ray Neutron Star in the Carina Nebula
The Astrophysical Journal Letters American Astronomical Society 985:1 (2025) L3-L3
Abstract:
Relativistic ejecta from stellar mass black holes: insights from simulations and synthetic radio images
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 540:1 (2025) 1084-1106
The Ejection of Transient Jets in Swift J1727.8−1613 Revealed by Time-dependent Visibility Modeling
The Astrophysical Journal Letters American Astronomical Society 984:2 (2025) l53
The origin of the very-high-energy radiation along the jet of Centaurus A
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 539:4 (2025) 3697-3713