Three-dimensional dust geometry of the LMC HI ridge region as revealed by the IRSF/SIRIUS survey
Three-dimensional dust geometry of the LMC HI ridge region as revealed by the IRSF/SIRIUS survey
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IRSF/SIRIUS 调查揭示的 LMC HI 脊区域的三维尘埃几何形状
DOI：
10.1093/pasj/psab052
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发表时间：
2021
影响因子：
2.3
通讯作者：
Tsuge Kisetsu
中科院分区：
文献类型：
--
作者：
Furuta Takuya;Kaneda Hidehiro;Kokusho Takuma;Nakajima Yasushi;Fukui Yasuo;Tsuge Kisetsu
本文提出了一种利用红外测量设施（IRSF）近红外（NIR）数据评估大麦哲伦云（LMC）山脊区域沿视线尘埃消光（AV）的新方法。在我们的方法中，我们从近红外颜色过剩中估计每个恒星的avv值，并在每条视线中从蓝到红对它们进行排序。利用排序后的avv的百分位值，我们构建了一个新的三维avmap。我们将所得的avmap与由速度分辨Hiand CO观测得到的总氢柱密度yn (H)进行比较。在LMC Hiridge地区，Fukui等（，PASJ, 69, L5）发现了两个速度分量和一个连接它们的中速分量。比较我们在不同速度下的三维avmap和n (H) map，我们发现尘埃的几何形状与之前研究中提出的两个速度之间正在进行的气体碰撞的情况一致。此外，我们发现两个速度分量之间存在2 inAV/N(H)的差异，这表明来自小麦哲伦云（SMC）的流入气体在该区域混合。总的来说，我们的研究结果支持在剑鱼座30中触发恒星形成是由于大尺度的气体碰撞引起的大尺度的LMC和SMC之间的潮汐相互作用。
We present a new method to evaluate the dust extinction (AV) along the line of sight using the InfraRed Survey Facility (IRSF) near-infrared (NIR) data of the Large Magellanic Cloud (LMC) Hiridge region. In our method, we estimate anAVvalue for each star from the NIR color excess and sort them from bluer to redder in each line of sight. Using the percentile values of the sortedAV, we construct a new three-dimensionalAVmap. We compare the resultantAVmap with the total hydrogen column densityN(H) traced by velocity-resolved Hiand CO observations. In the LMC Hiridge region, Fukui et al. (, PASJ, 69, L5) found two velocity components and an intermediate velocity one bridging them. Comparing our three-dimensionalAVmaps withN(H) maps at the different velocities, we find that the dust geometry is consistent with the scenario of ongoing gas collision between the two velocities as suggested in the previous study. In addition, we find a difference by a factor of 2 inAV/N(H) between the two velocity components, which suggests that inflow gas from the Small Magellanic Clouds (SMC) is mixed in this region. Overall, our results support triggered star formation in 30 Doradus due to the large-scale gas collision caused by tidal interaction between the LMC and the SMC.