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Possible explanations for the formation of ear-like structures in young Type Ia supernova remnants

文献类型：期刊论文

作者Bao, Biwen2,3; Wang, Yueyang4; Yang CY(杨初源)1; Zhang, Li2
刊名Astronomy and Astrophysics
出版日期2025-02-01
卷号694
关键词shock waves methods: numerical ISM: supernova remnants
ISSN号0004-6361
DOI10.1051/0004-6361/202449381
产权排序第4完成单位
文献子类Journal article (JA)
英文摘要Several young type Ia supernova remnants (SNRs) exhibit apparent axisymmetrical deviations from spherical symmetry, manifested as two opposite ear-like protrusions in their projected morphologies. The origin of this specific feature remains debated, with several physical mechanisms proposed as possible explanations. In this work, we propose two scenarios to explain the formation of ear-like structures: (i) the feedback of cosmic-ray (CR) acceleration via an effective adiabatic index, γeff, with spatial variations, and (ii) the large-scale pre-existing density gradient in the local interstellar medium (ISM). Our cylindrical hydrodynamic simulation results reveal that both scenarios can produce prominent protrusions well beyond the main shell, resembling the peculiar features observed in several young type Ia SNRs. Additionally, based on the detailed analysis of the simulation data, we attempt to elucidate the ear-formation process and suggest that the relative positions of contact discontinuity can serve as an observational diagnosis in pursuing the origin of ear-like structures. We also discuss the following points: (i) the theoretical prediction of type Ia SNRs with "ears" and the visibility of an ear-like structure in observations; (ii) the simulation-based inference concerning the emission properties of the ear-like regions and the implications of a qualitative comparison of our results with X-ray observations; and (iii) the potential combination of different scenarios. Despite various existing models, we tend to regard our proposed scenarios as potential alternatives, whereby the ear-like structures originate in pure ejecta-ISM interaction, distinct from the ejecta-circumstellar medium (CSM) or jet-CSM models.
学科主题天文学 ; 恒星与银河系
URL标识查看原文
资助项目National Natural Science Foundation of China[12203042];National Natural Science Foundation of China[12233006];National Natural Science Foundation of China[202001AU070100];National Natural Science Foundation of China[202301AU070009]
语种英语
资助机构National Natural Science Foundation of China[12203042, 12233006, 202001AU070100, 202301AU070009]
源URL[http://ir.ynao.ac.cn/handle/114a53/28176]  
专题星系类星体研究组
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650011, China
2.Department of Astronomy, Key Laboratory of Astroparticle Physics of Yunnan Province, Yunnan University, Kunming, 650091, China;
3.Key Laboratory of Statistical Modeling and Data Analysis of Yunnan Province, Yunnan University, Kunming, 650091, China;
4.Yunnan University of Chinese Medicine, Kunming, 650091, China;
推荐引用方式
GB/T 7714		 Bao, Biwen,Wang, Yueyang,Yang CY,et al. Possible explanations for the formation of ear-like structures in young Type Ia supernova remnants[J]. Astronomy and Astrophysics,2025,694.
APA Bao, Biwen,Wang, Yueyang,杨初源,&Zhang, Li.(2025).Possible explanations for the formation of ear-like structures in young Type Ia supernova remnants.Astronomy and Astrophysics,694.
MLA Bao, Biwen,et al."Possible explanations for the formation of ear-like structures in young Type Ia supernova remnants".Astronomy and Astrophysics 694(2025).

入库方式： OAI收割

来源：云南天文台

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