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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/221156
The influence of black holes on the binary population of the globular cluster Palomar 5
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The discovery of stellar-mass black holes (BHs) in globular clusters (GCs) raises the possibility of long-term retention of BHs within GCs. These BHs influence various astrophysical processes, including merger-driven gravitational waves and the formation of X-ray binaries. They also impact cluster dynamics by heating and creating low-density cores. Previous N-body models suggested that Palomar 5, a low-density GC with long tidal tails, may contain more than 100 BHs. To test this scenario, we conduct N-body simulations of Palomar 5 with primordial binaries to explore the influence of BHs on binary populations and the stellar mass function. Our results show that primordial binaries have minimal effect on the long-term evolution. In dense clusters with BHs, the fraction of wide binaries with periods >105 d decreases, and the disruption rate is independent of the initial period distribution. Multi-epoch spectroscopic observations of line-of-sight velocity changes can detect most bright binaries with periods below 104 d, significantly improving velocity dispersion measurements. Four BH-MS binaries in the model with BHs suggests their possible detection through the same observation method. Including primordial binaries leads to a flatter inferred mass function because of spatially unresolved binaries, leading to a better match of the observations than models without binaries, particularly in Palomar 5’s inner region. Future observations should focus on the cluster velocity dispersion and binaries with periods of 104–105 d in Palomar 5’s inner and tail regions to constrain BH existence
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WANG, Luojuon, GIELES, Mark, BAUMGARDT, Holger, LI, Chengyuan, PANG, Xiaoying, TANG, Baitian. The influence of black holes on the binary population of the globular cluster Palomar 5. _Monthly Notices of the Royal Astronomical Society_. 2023. Vol. 527, núm. 3, pàgs. 7495-7514. [consulta: 23 de gener de 2026]. ISSN: 0035-8711. [Disponible a: https://hdl.handle.net/2445/221156]