Modeling Pulsars in dense star clusters

Claire S. Ye*, Kyle Kremer, Sourav Chatterjee, Carl L. Rodriguez, Frederic A. Rasio

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Over a hundred millisecond radio pulsars (MSPs) have been observed in globular clusters (GCs), motivating theoretical studies of the formation and evolution of these sources through stellar evolution coupled to stellar dynamics. Here we study MSPs in GCs using realistic N-body simulations with our Cluster Monte Carlo code. We show that neutron stars (NSs) formed in electron-capture supernovae can be spun up through mass transfer to form MSPs. Both NS formation and spin-up through accretion are greatly enhanced through dynamical interaction processes. We find that our models for average GCs at the present day with masses â 2 × 105M⊠can produce up to 10-20 MSPs, while a very massive GC model with mass â 106M⊠can produce close to 100. We show that the number of MSPs is anti-correlated with the total number of stellar-mass black holes (BHs) retained in the host cluster. As a result, the number of MSPs in a GC could be used to place constraints on its BH population. Some intrinsic properties of MSP systems in our models (such as the magnetic fields and spin periods) are in good overall agreement with observations.

Original languageEnglish (US)
Pages (from-to)549-552
Number of pages4
JournalProceedings of the International Astronomical Union
Volume14
Issue number351
DOIs
StatePublished - Jan 1 2019

Keywords

  • globular clusters: general
  • methods: numerical
  • pulsars: general
  • stars: kinematics and dynamics
  • stars: neutron

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

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