The diversity of core-halo structure in the fuzzy dark matter model

Hei Yin Jowett Chan, Elisa G.M. Ferreira, Simon May, Kohei Hayashi, Masashi Chiba

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


In the fuzzy dark matter (FDM) model, gravitationally collapsed objects always consist of a solitonic core located within a virialized halo. Although various numerical simulations have confirmed that the collapsed structure can be described by a cored Navarro-Frenk-White-like density profile, there is still disagreement about the relation between the core mass and the halo mass. To fully understand this relation, we have assembled a large sample of cored haloes based on both idealized soliton mergers and cosmological simulations with various box sizes. We find that there exists a sizeable dispersion in the core-halo mass relation that increases with halo mass, indicating that the FDM model allows cores and haloes to coexist in diverse configurations. We provide a new empirical equation for a core-halo mass relation with uncertainties that can encompass all previously found relations in the dispersion, and emphasize that any observational constraints on the particle mass m using a tight one-to-one core-halo mass relation should suffer from an additional uncertainty of the order of 50 per cent for halo masses ≳ 109 [8× 10-23eV/(mc2)]3/2M⊙. We suggest that tidal stripping may be one of the effects contributing to the scatter in the relation.

Original languageEnglish
Pages (from-to)943-952
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Publication statusPublished - 2022 Mar 1


  • cosmology: theory
  • dark matter
  • galaxies: haloes
  • methods: numerical
  • software: simulations

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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