https://scholars.lib.ntu.edu.tw/handle/123456789/606844
標題: | On the Random Motion of Nuclear Objects in a Fuzzy Dark Matter Halo | 作者: | Dutta Chowdhury D Van Den Bosch F.C Robles V.H Van Dokkum P Schive H.-Y TZI-HONG CHIUEH Broadhurst T. HSI-YU SCHIVE |
公開日期: | 2021 | 卷: | 916 | 期: | 1 | 來源出版物: | Astrophysical Journal | 摘要: | Fuzzy dark matter (FDM), consisting of ultralight bosons, is an intriguing alternative to cold dark matter. Numerical simulations that solve the Schr?dinger-Poisson (SP) equation show that FDM halos consist of a central solitonic core, which is the ground state of the SP equation, surrounded by an envelope of interfering excited states. These excited states also interfere with the soliton, causing it to oscillate and execute a confined random walk with respect to the halo center of mass. Using high-resolution numerical simulations of a FDM halo with in isolation, we demonstrate that the wobbling, oscillating soliton gravitationally perturbs nuclear objects, such as supermassive black holes or dense star clusters, causing them to diffuse outwards. In particular, we show that, on average, objects with mass ?0.3% of the soliton mass are expelled from the soliton in ?3, after which they continue their outward diffusion due to gravitational interactions with the soliton and the halo granules. More massive objects (?), while executing a random walk, remain largely confined to the soliton due to dynamical friction. We also present an effective treatment of the diffusion, based on kinetic theory, that accurately reproduces the outward motion of low-mass objects and briefly discuss how the observed displacements of star clusters and active galactic nuclei from the centers of their host galaxies can be used to constrain FDM. ? 2021. The American Astronomical Society. All rights reserved.. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85112654983&doi=10.3847%2f1538-4357%2fac043f&partnerID=40&md5=94876abc392ef9591de2e5a1d64a060a https://scholars.lib.ntu.edu.tw/handle/123456789/606844 |
ISSN: | 0004637X | DOI: | 10.3847/1538-4357/ac043f |
顯示於: | 天文物理研究所 |
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