Pulsars in Globular Clusters With the SKAO

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Pulsars in Globular Clusters With the SKAO

Authors

M. Bagchi, F. Abbate, V. Balakrishnan, M. C. i Bernadich, B. Bhattacharyya, A. Dutta, P. C. C. Freire, K. Halley, J. W. T. Hessels, S. Kumari, D. R. Lorimer, A. Possenti, R. Nag, S. M. Ransom, A. Ridolfi, V. Venkatraman Krishnan, W. W. Zhu

Abstract

Globular clusters (GCs) are highly efficient factories of radio pulsars: per unit of stellar mass, they contain about 1000 times more pulsars than in the Galactic field. Thus far, 345 radio pulsars have been found in GCs. These can be used as precision probes of the structure, gas content, magnetic field, and dynamic history of their host clusters; some of them are also highly interesting in their own right because they probe exotic stellar evolution scenarios, the physics of dense matter, accretion, gravity, etc. One of them (PSR~J0514$-$4002E) might even be the first pulsar - black hole system known. Deep searches with SKA telescopes will only require one to a few tied-array beams, and can be done during early commissioning of the telescopes, before an all-sky pulsar survey using hundreds to thousands of tied-array beams is feasible. Even a conservative approach predicts discoveries only with the core of SKA-MID AA*. Eventually, SKA-MID AA4 is expected to increase the number of discoveries even more, leading to more than doubling the current known population. Thus, a dedicated search for pulsars in GCs will fully utilise the best possible natural laboratories to study various branches of physics and astrophysics, including the properties of dense matter, stellar evolution, and the dynamical history of these GCs.

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