N49: The First Robust Discovery of Recombining Plasma in an Extra-galactic Supernova Remnant
N49: The First Robust Discovery of Recombining Plasma in an Extra-galactic Supernova Remnant
复制标题
N49：首次在银河系外超新星遗迹中发现重组等离子体
DOI：
10.1088/0004-637x/808/1/77
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Hiroya
中科院分区：
文献类型：
--
作者：
Uchida;Hiroyuki; Koyama;Katsuji; Yamaguchi;Hiroya
最近在超新星遗迹(SNR)中发现的重组等离子体(RP)极大地改变了我们对SNR演化的理解。到目前为止，已经在银河系中发现了十几个RP SNR。在这里，我们介绍了Suzaku对LMC中四个SNR的深入观测，即N49，N49B，N23和DEM L71，以精确确定它们的等离子体状态。我们的统一分析表明，在这些信噪比中，只有N49处于重组态，这是首次从银河系外的信噪比中发现了RP。考虑到RPS只在核心塌缩SNR中被发现，我们的结果强烈地表明这个SNR来自大质量恒星。另一方面，在N23中没有明确的证据证实存在RP，此前曾声称N23检测到了重组线和连续体。比较目前已发现的RPSNR的物理性质，我们发现它们都可以被归类为“混合形态”类，与周围的分子云相互作用。这可能是确定RPS形成机制的关键。
Recent discoveries of recombining plasmas (RPs) in supernova remnants (SNRs) have dramatically changed our understanding of SNR evolution. To date, a dozen RP SNRs have been identified in the Galaxy. Here, we present Suzaku deep observations of four SNRs in the LMC, namely, N49, N49B, N23, and DEM L71, for accurate determination of their plasma states. Our uniform analysis reveals that of these SNRs, only N49 is in the recombining state, which is the first robust discovery of an RP from an extra-galactic SNR. Given that RPs have only been identified in core-collapse SNRs, our results strongly suggest a massive star origin for this SNR. On the other hand, no clear evidence of an RP is confirmed in N23, for which detection of recombination lines and continua was previously claimed. Comparing the physical properties of the RP SNRs identified so far, we find that all of them can be categorized into the" mixed-morphology" class, interacting with surrounding molecular clouds. This might be a key to determining the formation mechanisms of RPs.