Small-Scale Structure of the SN 1006 Shock with Chandra Observations

The Astrophysical Journal 589 巻 2 号 827-837 頁 2003-06 発行
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タイトル ( eng )
Small-Scale Structure of the SN 1006 Shock with Chandra Observations
作成者
Bamba Aya
Yamazaki Ryo
Ueno Masaru
Koyama Katsuji
収録物名
The Astrophysical Journal
589
2
開始ページ 827
終了ページ 837
抄録
The northeast shell of SN 1006 is the most probable acceleration site of high-energy electrons (up to ∼100 TeV) with the Fermi acceleration mechanism at the shock front. We resolved nonthermal filaments from thermal emission in the shell with the excellent spatial resolution of Chandra. The thermal component is extended over ∼100&arcsec; (about 1 pc at 1.8 kpc distance) in width, consistent with the shock width derived from the Sedov solution. The spectrum is fitted with a thin thermal plasma of kT = 0.24 keV in nonequilibrium ionization, typical for a young supernova remnant. The nonthermal filaments are likely thin sheets with scale widths of ∼4&arcsec; (0.04 pc) and ∼20&arcsec; (0.2 pc) upstream and downstream, respectively. The spectra of the filaments are fitted with a power-law function of index 2.1–2.3, with no significant variation from position to position. In a standard diffusive shock acceleration model, the extremely small scale length in the upstream region requires the magnetic field nearly perpendicular to the shock normal. The injection efficiency (η) from thermal to nonthermal electrons around the shock front is estimated to be ∼1 × 10-3 under the assumption that the magnetic field in the upstream region is 10 μG. In the filaments, the energy densities of the magnetic field and nonthermal electrons are similar to each other, and both are slightly smaller than that of thermal electrons. These results suggest that the acceleration occurs in more compact regions with larger efficiency than suggested by previous studies.
著者キーワード
acceleration of particles
shock waves
supernova remnants
X-ray ISM
NDC分類
天文学・宇宙科学 [ 440 ]
言語
英語
資源タイプ 学術雑誌論文
出版者
Chicago University Press
発行日 2003-06
権利情報
Copyright (c) 2003 The American Astronomical Society
出版タイプ Version of Record(出版社版。早期公開を含む)
アクセス権 オープンアクセス
収録物識別子
[ISSN] 0004-637X
[DOI] 10.1086/374687
[DOI] http://dx.doi.org/10.1086/374687