中国科学院大学学报2024，Vol.41Issue(3)：306-311,6.DOI:10.7523/j.ucas.2022.076
Geminga TeV晕周围星际介质的湍动特性
Turbulence properties in interstellar medium around Geminga TeV halo
摘要
Abstract
Space power spectrum analysis is a common method to study the turbulence property of interstellar medium.In this paper,we applied this method to analyze a neutral hydrogen cloud near Geminga with data from the GALFA(galactic Arecibo L-band feed array)HI survey.The spatial power spectrum of the cloud can be well described by a power-law with an index of-4.0±0.1 which is steeper than the turbulent power spectrum of local galactic interstellar medium(the spectral index is larger than-3.0).We considered several physical conditions that may lead to the steeper spectrum and found none of the thin HI slice along the line of sight direction,highly ordered magnetic field perpendicular to line of sight direction or energy loss during the energy cascade be responsible for the steeper spectrum.This indicates that the turbulence property around Geminga is very different to the local galactic interstellar medium which may account for the abnormally low diffusion coefficient in Gemninga TeV halo.关键词
星际介质/湍动/Geminga/空间功率谱分析Key words
interstellar medium/turbulence/Geminga/space power spectrum analysis分类
天文与地球科学引用本文复制引用
程皓麟,朱辉,陈天禄,田文武,崔晓红,吴丹,高启..Geminga TeV晕周围星际介质的湍动特性[J].中国科学院大学学报,2024,41(3):306-311,6.基金项目
国家重点研发计划项目(2018YFA0404202,2018YFA0404203,2018YFA0404603)和国家自然科学基金(12147218,U1938112,12073039)资助 （2018YFA0404202,2018YFA0404203,2018YFA0404603）
