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arXiv 1109.3945astro-ph.CO
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LMC SNR J0550-6823的射电连续谱观测

Radio continuum observations of LMC SNR J0550-6823

L. M. Bozzetto, M. D. Filipović, E. J. Crawford, J. L. Payne, A. Y. De Horta, M. Stupar

摘要:

我们报告了澳大利亚望远镜紧凑阵列(ATCA)对大麦云(LMC)超新星遗迹(SNR)J 0550 -6823(DEM L328)的新观测。这个天体是一个典型的马蹄形信噪比,直径为373”x 282”+- 4”(90 x 68 +- 1),是本星系群中已知最大的信噪比之一。我们估计一个相对陡峭的射电频谱指数α = -0.79 +-0.27。然而,其强于预期的50% +-10%的极化对于更老和更进化的SNR是非典型的。我们还注意到[Oiii]和无线电图像之间的强相关性,将此SNR分类为氧占主导地位。

英文摘要:

We report on new Australia Telescope Compact Array (ATCA) observations of the Large Magellanic Cloud (LMC) supernova remnant (SNR) J0550-6823 (DEM L328). This object is a typical horseshoe SNR with a diameter of 373" x 282" +- 4" (90 x 68 +- 1), making it one of the largest known SNRs in the Local Group. We estimate a relatively steep radio spectral index of alpha = -0.79 +- 0.27. However, its stronger than expected polarisation of 50% +- 10% is atypical for older and more evolved SNRs. We also note a strong correlation between [Oiii] and radio images, classifying this SNR as oxygen dominant.

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