论文标题
Viscacha调查-II。麦哲伦云中星团的结构
The VISCACHA survey -- II. Structure of star clusters in the Magellanic Clouds periphery
论文作者
论文摘要
我们提供了一组均匀的结构参数,这些参数位于小麦芽云(SMC)和大麦哲伦云(LMC)的外围。簇的恒星密度和表面亮度曲线是由深,AO辅助光学图像和均匀分析技术建立的。结构参数来自King和Elson等人。模型配件。还提供了集成的大小和质量(对于子样本)。该样品大部分包含低表面亮度簇,距离为4.5至6.5 kpc介于4.5至6.5 kpc之间,分别距离LMC和SMC中心1到6.5 kpc。我们分析了它们的空间分布和结构特性,并将它们与内簇的分布进行了比较。估计了半灯和雅各比半径,可以评估Roche体积潮汐填充。我们发现:(i)对于我们的LMC簇样品,潮汐半径平均比以前研究的内部簇要大; (ii)位于西南部的LMC簇的核心半径色散往往更大,位置角度为$ \ sim $ 200度,距离LMC中心的$ \ sim $ 5度约为$ 5度,即靠近SMC的LMC群集; (iii)具有已知年龄的簇的核心半径演变与内簇相似; (iv)与4 kpc更近的半乳缘距离的SMC簇过度填充; (v)最近的云碰撞并未在我们的分析可能揭示的LMC簇结构上留下痕迹。
We provide a homogeneous set of structural parameters of 83 star clusters located at the periphery of the Small Magellanic Cloud (SMC) and the Large Magellanic Cloud (LMC). The clusters' stellar density and surface brightness profiles were built from deep, AO assisted optical images, and uniform analysis techniques. The structural parameters were obtained from King and Elson et al. model fittings. Integrated magnitudes and masses (for a subsample) are also provided. The sample contains mostly low surface brightness clusters with distances between 4.5 and 6.5 kpc and between 1 and 6.5 kpc from the LMC and SMC centres, respectively. We analysed their spatial distribution and structural properties, comparing them with those of inner clusters. Half-light and Jacobi radii were estimated, allowing an evaluation of the Roche volume tidal filling. We found that: (i) for our sample of LMC clusters, the tidal radii are, on average, larger than those of inner clusters from previous studies; (ii) the core radii dispersion tends to be greater for LMC clusters located towards the southwest, with position angles of $\sim$200 degrees and about $\sim$5 degrees from the LMC centre, i.e., those LMC clusters nearer to the SMC; (iii) the core radius evolution for clusters with known age is similar to that of inner clusters; (iv) SMC clusters with galactocentric distances closer than 4 kpc are overfilling; (v) the recent Clouds collision did not leave marks on the LMC clusters' structure that our analysis could reveal.