Lai, Paul Chong Wa; Agostini, Matteo; Oikonomou, Foteini; Crudele, Beatrice; Owen, Ellis R; Wu, Kinwah; (2023) Neutrino imaging of the Galactic Centre and Millisecond Pulsar Population. In: Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023). (pp. pp. 1-8). ICRC

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Abstract

Despite the potentially large population of millisecond pulsars in the Galactic Centre, direct detection of them is almost impossible using the current radio telescopes, due to severe pulse broadening caused by radiation scattering. We propose that imaging the Galactic Centre using neutrinos provides us a way to constrain the millisecond pulsar population. Millisecond pulsars are proposed cosmic-ray accelerators. The high-energy protons they produce will collide with the baryonic matter in the central molecular zone, which creates charged and neutral pions that decay into neutrinos and γ rays, respectively. The specific fluxes of neutrino and γ -ray emission for the case with CS emission as the baryon tracer in the Central Molecular Zone that we computed, subjected to γ -ray observation by H.E.S.S., set a conservative upper limit of NMSP<10,000 for the Galactic Centre millisecond pulsar population, with an injecting proton energy spectral index Γ=−1 and an efficiency of fp=1% converting the pulsar's rotational power to cosmic-ray power. This population of millisecond pulsars could explain the GeV γ -ray excess in the Galactic Centre.

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