First radio detection of PSR J2238+5903 yields DM = 247.5 ± 3.0 pc cm^{-3} and a model distance of 7.4 ± 3.9 kpc that anchors the physical scale and TeV efficiency of candidate halo 1LHAASO J2238+5900.
A pulsar escaping an ancient open cluster via tidal stripping
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abstract
Open clusters are the primary birthplaces of stars in the Milky Way disk, yet their neutron star progeny are rarely found within them, presumably due to supernova-induced kicks that eject them at birth. Here we report the arcsec-level localization of the pulsar PSR J1921+3745 to the tidal tail of NGC 6791, one of the oldest and most massive open clusters. Our N-body simulation shows that more than 95% of neutron stars formed in such clusters have been ejected. This pulsar's location in the tidal tail indicates it was retained for billions of years before being stripped by Galactic tides. This long-term retention requires low natal kicks, consistent with formation via electron-capture supernova. Our findings capture a rare snapshot of a neutron star transitioning into the Galactic field, identifying tidal stripping of ancient clusters as a verified source of the Galactic neutron star population.
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FAST Discovery of $\mu$Jy Radio Pulsations from PSR J2238+5903, Providing a DM Distance Anchor for the Candidate TeV Halo 1LHAASO J2238+5900
First radio detection of PSR J2238+5903 yields DM = 247.5 ± 3.0 pc cm^{-3} and a model distance of 7.4 ± 3.9 kpc that anchors the physical scale and TeV efficiency of candidate halo 1LHAASO J2238+5900.