The low cosmic-ray density in the Polaris Flare

被引：0
作者：
Cui, Zhi-Wei [1 ,2 ]
Yang, Rui-Zhi [1 ,2 ]
Liu, Bing [1 ,2 ,3 ]
机构：
[1] Univ Sci & Technol China, Sch Phys Sci, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Peoples R China
[2] Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China
[3] Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Peoples R China
来源：
RESEARCH IN ASTRONOMY AND ASTROPHYSICS | 2021年 / 21卷 / 10期
关键词：
cosmic rays; gamma rays; ISM; clouds; DARK GAS; PROPAGATION; CLOUDS;
D O I：
10.1088/1674-4527/21/10/246
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We reported the gamma-ray observation towards the giant molecular cloud Polaris Flare. Together with the dust column density map, we derived the cosmic ray (CR) density and spectrum in this cloud. Compared with the CR measured locally, the CR density in the Polaris Flare is significantly lower and the spectrum is softer. Such a different CR spectrum reveals either a rather large gradient of CR distribution in the direction perpendicular to the Galactic plane or a suppression of CR inside molecular clouds.
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