Understanding the feeble giant Crater II with tidally stretched wave dark matter
Pozo A. Broadhurst T. Emami R. Smoot G.
1 September 2022Oxford University Press
Monthly Notices of the Royal Astronomical Society
2022#515Issue 22624 - 2632 pp.
The unusually large dwarf galaxy Crater II, with its small velocity dispersion, ≃3 km s-1, defies expectations that low-mass galaxies should be small and dense. We combine the latest stellar and velocity dispersion profiles finding Crater II has a prominent dark core of radius ≃ 0.71+0.09-0.08 kpc, surrounded by a low density halo, with a transition visible between the core and the halo. We show that this profile matches the distinctive core-halo profile predicted by Wave Dark Matter as a Bose-Einstein condensate, ψDM, where the ground state soliton core is surrounded by a tenuous halo of interfering waves, with a marked density transition predicted between the core and halo. Similar core-halo structure is seen in most dwarf spheroidal galaxies (dSphs), but with smaller cores, ≃0.25 kpc and higher velocity dispersions, ≃9 km s-1, and we argue here that Crater II may have been a typical dSph that has lost most of its halo mass to tidal stripping, so its velocity dispersion is lower by a factor of 3 and the soliton is wider by a factor of 3, following the inverse scaling required by the Uncertainty Principle. This tidal solution for Crater II in the context of ψDM is supported by its small pericenter of ≃20 kpc established by Gaia, implying significant tidal stripping of Crater II by the Milky Way is expected.
Dark Matter , Galaxy: kinematics and dynamics
Text of the article Перейти на текст статьи
Department of Physics, University of the Basque Country UPV/EHU, Bilbao, E-48080, Spain
Dipc, Basque Country UPV/EHU, San Sebastian, E-48080, Spain
Ikerbasque, Basque Foundation for Science, Bilbao, E-48011, Spain
Center for Astrophysics
Institute for Advanced Study, Department of Physics, Ias Tt, Wf Chao Foundation Professor, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, 999077, Hong Kong
Energetic Cosmos Laboratory, Nazarbayev University, 53, Kabanbay batyr Ave., Nur-Sultan city, 010000, Kazakhstan
Physics Department, University of California, Emeritus, Berkeley, 94720, CA, United States
Paris Centre for Cosmological Physics, Apc, AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/lrfu, Université Sorbonne Paris Cité, 10, rue Alice Domon et Leonie Duquet, Paris, 75205 CEDEX 13, France
Department of Physics
Dipc
Ikerbasque
Center for Astrophysics
Institute for Advanced Study
Energetic Cosmos Laboratory
Physics Department
Paris Centre for Cosmological Physics
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026