Kremer, Kyle and Piro, Anthony L. and Li, Dongzi (2021) Dynamical Formation Channels for Fast Radio Bursts in Globular Clusters. The Astrophysical Journal Letters, 917 (1). L11. ISSN 2041-8205
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Abstract
The repeating fast radio burst (FRB) localized to a globular cluster (GC) in M81 challenges our understanding of FRB models. In this Letter, we explore dynamical formation scenarios for objects in old GCs that may plausibly power FRBs. Using N-body simulations, we demonstrate that young neutron stars (NSs) may form in GCs at a rate of up to ∼50 Gpc−3 yr−1 through a combination of binary white dwarf (WD) mergers, WD–NS mergers, binary NS mergers, and accretion-induced collapse of massive WDs in binary systems. We consider two FRB emission mechanisms: First, we show that a magnetically powered source (e.g., a magnetar with field strength ≳1014 G) is viable for radio emission efficiencies ≳10−4. This would require magnetic activity lifetimes longer than the associated spin-down timescales and longer than empirically constrained lifetimes of Galactic magnetars. Alternatively, if these dynamical formation channels produce young rotation-powered NSs with spin periods of ∼10 ms and magnetic fields of ∼1011 G (corresponding to spin-down lifetimes of ≳105 yr), the inferred event rate and energetics can be reasonably reproduced for order unity duty cycles. Additionally, we show that recycled millisecond pulsars or low-mass X-ray binaries similar to those well-observed in Galactic GCs may also be plausible channels, but only if their duty cycle for producing bursts similar to the M81 FRB is small.
Item Type: | Article |
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Subjects: | South Asian Library > Physics and Astronomy |
Depositing User: | Unnamed user with email support@southasianlibrary.com |
Date Deposited: | 09 May 2023 07:02 |
Last Modified: | 14 Jun 2024 08:07 |
URI: | http://journal.repositoryarticle.com/id/eprint/744 |