重力彈射對星系中心之冷暗物質密度分佈的影響

Impact of Gravitational Slingshot of Dark Matter on Galactic Halo Profiles

林曜宇(Yao-Yu Lin)

指導教授 ： 陳丕燊

國立臺灣大學/理學院/物理研究所/碩士(2015年)

https://doi.org/10.6342/NTU.2015.02416

並列摘要

We study the impact of gravitational slingshot effect from massive astrophysical bodies on the distribution of cold dark matter in ultra-faint dwarf galaxies. Such massive astrophysical bodies are intermediate massive black
hole from the remnant of Pop III stars. Multiple gravitational encounters of a lower mass dark matter particle with massive astrophysical bodies would lead to an average energy gain for the dark matter, similar to second order Fermi acceleration. We calculate the average energy gain and model the integrated
effect on the dark matter profile. We find that such slingshot effect due to the remnant of first generation stars were significant in certain cases, which changes the dark matter distribution at the galactic center and flattened it from
an initial cusp profile.

並列關鍵字

cosmology ； dark matter ； cusp-core problem ； gravitational slingshot

參考文獻

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[42] Dykla, John J., Robert Cacioppo, and Asim Gangopadhyaya. ”Gravitational slingshot.” American Journal of Physics 72.5 (2004): 619-621.

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