Neutron stars and millisecond pulsars in star clusters: implications for the diffuse $\gamma$-radiation from the Galactic Centre

Abstract

Globular clusters (GCs) are the ideal environment for the formation of neutron stars (NSs) and millisecond pulsars (MSPs). NSs origin and evolution provide a useful information on stellar dynamics and evolution in star clusters, and are among the most interesting astrophysical objects, being precursors of several high-energy phenomena such as gravitational waves and gamma-ray bursts. Due to a large velocity kick that they receive at birth, most of the NSs escape the local field, affecting the evolution and dynamics of their parent cluster. In this paper, we study the origin and dynamical evolution of NSs within GCs with different initial masses, metallicities and primordial binary fractions. We find that the radial profile of NSs is shaped by the BH content of the cluster, which partially quenches the NS segregation until most of the BHs are ejected from the system. Independently on the cluster mass and initial configuration, the NSs map the average stellar population, as their average radial distance is $\approx 60-80\%$ of the cluster half-mass radius. Finally, by assuming a recycling fraction of $f_{\mathrm{rec}}=0.1$ and an average MSP gamma-ray emission of $L_{\gamma }=2\times 10^{33}$ erg s${}^{-1}$, we show that the typical gamma-ray emission from our GCs agrees with observations and supports the MSP origin of the gamma-ray excess signal observed by the Fermi-LAT telescope in the Galactic Centre.

9 pages, 4 figures, 2 Tables, accepted by MNRAS

References in corpus (2)

• Hydrodynamical Neutron-star Kicks in Electron-capture Supernovae and Implications for the CRAB Supernova
• Millisecond pulsars and the gamma-ray excess in Andromeda

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• On the Rate of Neutron Star Binary Mergers from Globular Clusters
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• Millisecond Pulsars and Black Holes in Globular Clusters
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• Tidal Disruptions of Stars by Black Hole Remnants in Dense Star Clusters
• Black hole and neutron star mergers in Galactic Nuclei: the role of triples
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• Do star clusters form in a completely mass-segregated way?
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• Demographics of neutron stars in young massive and open clusters
• Demographics of triple systems in dense star clusters
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• Black hole-neutron star mergers from triples II: the role of metallicity and spin-orbit misalignment
• Pevatron at the Galactic Center: Multi-Wavelength Signatures from Millisecond Pulsars
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• Mass segregation and dynamics of primordial binaries in star clusters with a radially anisotropic velocity distribution
• Millisecond pulsars and the gamma-ray excess in Andromeda
• Possible binary neutron star merger history of the primary of GW230529
• Hunting intermediate-mass black holes with LISA binary radial velocity measurements
• Mind the gap: The discrepancy between simulation and reality drives interpretations of the Galactic Center Excess
• Constraining neutron star radii in black hole-neutron star mergers from their electromagnetic counterparts
• A Fermi-LAT Study of Globular Cluster Dynamical Evolution in the Milky Way: Millisecond Pulsars as the Probe
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• Gravitational Microlensing Rates in Milky Way Globular Clusters