LMC SNR 0509-67.5中心的漫射源是z = 0.031的背景星系
The Diffuse Source at the Center of LMC SNR 0509-67.5 is a Background Galaxy at z = 0.031
摘要：
Ia型超新星（SNe Ia）以其在测量宇宙学距离中的用途而闻名，但我们对它们的祖先恒星的具体知识的持续缺乏既是一个争论的问题，也是系统误差的来源。在我们试图回答这个问题的过程中，我们提出了明确的证据，证明LMC SNR 0509-67.5，即400 +/-50年前在大麦云云中爆炸的SN Ia的残余物，在原始超新星爆炸的地点附近没有任何点源（恒星），由此我们得出结论，这颗特殊的超新星一定有一个由两颗白矮星组成的祖先系统（Schaefer & Pagnotta 2012）。然而，有证据表明在残骸的中心附近有星云，这可能是质量较小的WD留下的碎屑，或者可能是与超新星爆炸无关的背景星系。我们获得了长缝光谱的中央星云区域使用GMOS双子座南，以确定这两种可能性是正确的。光谱显示H-α发射的红移为z = 0.031，这意味着LMC SNR 0509-67.5中心的星云是一个背景星系，与超新星无关。
英文摘要：
Type Ia supernovae (SNe Ia) are well-known for their use in the measurement of cosmological distances, but our continuing lack of concrete knowledge about their progenitor stars is both a matter of debate and a source of systematic error. In our attempts to answer this question, we presented unambiguous evidence that LMC SNR 0509-67.5, the remnant of an SN Ia that exploded in the Large Magellanic Cloud 400 +/- 50 years ago, did not have any point sources (stars) near the site of the original supernova explosion, from which we concluded that this particular supernova must have had a progenitor system consisting of two white dwarfs (Schaefer & Pagnotta 2012). There is, however, evidence of nebulosity near the center of the remnant, which could have been left over detritus from the less massive WD, or could have been a background galaxy unrelated to the supernova explosion. We obtained long-slit spectra of the central nebulous region using GMOS on Gemini South to determine which of these two possibilities is correct. The spectra show H-alpha emission at a redshift of z = 0.031, which implies that the nebulosity in the center of LMC SNR 0509-67.5 is a background galaxy, unrelated to the supernova.
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