论文标题
真正的大型麦哲伦云时代差距星团
A genuine Large Magellanic Cloud age gap star cluster
论文作者
论文摘要
我们确认存在第二个大麦芽云（LMC）星形群，KMHK 1592，其年龄属于所谓的LMC星团年龄间隔的中间，长时间（〜4-11 Gyr）没有明星群集没有发现ESO121-SC03。 KMHK1592的年龄（8.0+-0.5 GYR）和金属性（[Fe/H] = -1.0+-0.2 Dex）的年龄源自理论等同源的拟合度，该符合内在的星团颜色颜色 - 颜色 - 磁性图序列，这些图是使用强大的标准级别的抗恒星概率的，这些序列是使用强大的。由于星团的相对亮度相对低亮度，因此使用了深色的GMOS图像。我们讨论了三种瞥见的场景的利弊，可以解释LMC郊区郊区的两个LMC年龄差异星团的存在，即：位于现场星团群集形成，从小的麦哲伦云中捕获或从小矮人的小矮星银河中捕获。
We confirm the existence of a second Large Magellanic Cloud (LMC) star cluster, KMHK 1592, with an age that falls in the middle of the so-called LMC star cluster age gap, a long period of time (~ 4 - 11 Gyr) where no star cluster had been uncovered, except ESO121-SC03. The age (8.0+-0.5 Gyr) and the metallicity ([Fe/H]=-1.0+-0.2 dex) of KMHK1592 were derived from the fit of theoretical isochrones to the intrinsic star cluster colour-magnitude diagram sequences, which were unveiled using a robust star-by-star membership probability procedure. Because of the relative low brightness of the star cluster, deep GEMINI GMOS images were used. We discuss the pros and cons of three glimpsed scenarios that could explain the presence of both LMC age gap star clusters in the outskirts of the LMC, namely: in-situ star cluster formation, capture from the Small Magellanic Cloud, or accretion of a small dwarf galaxy.
