Spectral Index Distribution of Various Scale Components in Supernova Remnant Cassiopeia A

被引：0

作者：

Lei, Xianhuan ^{[1
,2
]}

Zhu, Hui ^{[1
]}

Yin, Zongyao ^{[3
]}

Zhang, Haiyan ^{[1
,2
]}

Tian, Wenwu ^{[1
,2
]}

Yu, Xianchuan ^{[3
]}

机构：

[1] Chinese Acad Sci, Key Lab Radio Astron & Technol, Natl Astron Observ, Beijing 100101, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 101408, Peoples R China

[3] Beijing Normal Univ, Sch Artificial Intelligence, Beijing 100875, Peoples R China

来源：

RESEARCH IN ASTRONOMY AND ASTROPHYSICS | 2024年 / 24卷 / 05期

基金：

中国国家自然科学基金;

关键词：

ISM: supernova remnants; (ISM:) cosmic rays; radio continuum: ISM; PARTICLE-ACCELERATION; A SUPERNOVA; ABSOLUTE SPECTRUM; RADIO; EMISSION; DENSITY; EJECTA; SHOCKS; SITES; RAYS;

D O I：

10.1088/1674-4527/ad3dc4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Cassiopeia A (Cas A) is a well-known candidate for studying cosmic-ray acceleration, in which compact features of various scales have attracted much attention. Based on observations by the Very Large Array of Cas A at 6 cm and 21 cm, we measure the spectral index distribution of various scale components using the observation of the 1998 epoch. We decompose its total density image into nine scale components, and map the temperature spectral index distribution of each component, which ranges from -2.48 +/- 0.01 to -2.91 +/- 0.05. We find that the spectral indices increase from the small scale to large scale components. A damped post-shock magnetic field model with a strength larger than similar to 200 mu G and a damping length scale less than similar to 10% of the remnant radius can account for the spectral index variation naturally.

引用

页数：7

共 43 条

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