论文标题
新的光学鉴定的大麦芽云中的超新星残留物
New Optically Identified Supernova Remnants in the Large Magellanic Cloud
论文作者
论文摘要
我们提供了三个超新星残留物和16个超新星残留物（SNR）候选者的新光学样本。这些对象最初是使用深H $α$，[SII]和[OIII]窄带成像选择的。大多数新发现的物体位于LMC主体边缘附近或周围的密集区域。加上先前建议的MCSNR J0541-6659，我们确认了两个新对象的SNR性质：MCSNR J0522-6740和MCSNRJ0542-7104。 12个LMC对象的光谱随访观察结果确认高[SII]/H $α$ A发射线比率为0.5至1.1。我们认为候选人J0509-6402是可能的IA类型超新星的残余的一个特殊例子，该款位于LMC主体北部约2 $^\ circ $（$ \ sim 1.75 $ kpc）。我们还发现，样本中的SNR候选物的大小明显大于当前已知的LMC SNR，$ \ sim 2 $。这可能意味着我们发现了一个以前未知但预测的较旧类的大型LMC SNR，仅在光学上可见。最后，我们建议这些LMC SNR大多数都居住在非常稀少的环境中，直到其进化范围结束时，它们对无线电和X射线望远镜的可见程度较低。
We present a new optical sample of three Supernova Remnants and 16 Supernova Remnant (SNR) candidates in the Large Magellanic Cloud(LMC). These objects were originally selected using deep H$α$, [SII] and [OIII] narrow-band imaging. Most of the newly found objects are located in less dense regions, near or around the edges of the LMC's main body. Together with previously suggested MCSNR J0541-6659, we confirm the SNR nature for two additional new objects: MCSNR J0522-6740 and MCSNRJ0542-7104. Spectroscopic follow-up observations for 12 of the LMC objects confirm high [SII]/H$α$ a emission-line ratios ranging from 0.5 to 1.1. We consider the candidate J0509-6402 to be a special example of the remnant of a possible Type Ia Supernova which is situated some 2$^\circ$ ($\sim 1.75$kpc) north from the main body of the LMC. We also find that the SNR candidates in our sample are significantly larger in size than the currently known LMC SNRs by a factor of $\sim 2$. This could potentially imply that we are discovering a previously unknown but predicted, older class of large LMC SNRs that are only visible optically. Finally, we suggest that most of these LMC SNRs are residing in a very rarefied environment towards the end of their evolutionary span where they become less visible to radio and X-ray telescopes.
