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Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
Abstract:
We present the results of observations aimed at discovering and studying
pulsars in the core-collapsed globular cluster (GC) NGC 6522 performed by the
MeerTIME and TRAPUM Large Survey Project with the MeerKAT telescope. We have
discovered two new isolated pulsars bringing the total number of known pulsars
in the cluster to six. PSR J1803$-$3002E is a mildly recycled pulsar with spin
period of 17.9 ms while pulsar PSR J1803$-$3002F is a slow pulsar with spin
period of 148.1 ms. The presence of isolated and slow pulsars is expected in
NGC 6522 and confirms the predictions of previous theories for clusters at this
stage in evolution. We further present a tentative timing solution for the
millisecond pulsar (MSP) PSR J1803$-$3002C combining older observations taken
with the Parkes 64m radio telescope, Murriyang. This solution implies a
relatively small characteristic age of the pulsar in contrast with the old age
of the GC. The presence of a slow pulsar and an apparently young MSP, both rare
in GCs, suggests that their formation might be linked to the evolutionary stage
of the cluster.
