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

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

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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～200 μG and a damping length scale less than～10％of the remnant radius can account for the spectral index variation naturally.

ISM:supernova remnants(ISM:)cosmic raysradio continuum:ISM

Xianhuan Lei、Hui Zhu、Zongyao Yin、Haiyan Zhang、Wenwu Tian、Xianchuan Yu

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Key Laboratory of Radio Astronomy and Technology,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China

University of Chinese Academy of Sciences,Beijing 101408,China

School of Artificial Intelligence,Beijing Normal University,Beijing 100875,China

National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)China Manned Space ProjectYouth Innovation Promotion Association of CAS

1204130112073039CMS-CSST-2021-A092023000015

2024

10.1088/1674-4527/ad3dc4

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(5)
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