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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Extinction and dust/gas ratio in the Hi ridge region of the LMC based on the IRSF/SIRIUS near-infrared survey
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Extinction and dust/gas ratio in the Hi ridge region of the LMC based on the IRSF/SIRIUS near-infrared survey

机译：基于IRSF / SIRIUS近红外测量的LMC HI RIDGE区域的消光和灰尘/气体比

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摘要

We present a dust extinction A(V) map of the Large Magellanic Cloud (LMC) in the Hi ridge region using the InfraRed Survey Facility (IRSF) near-infrared (IR) data, and compare the A(V) map with the total hydrogen column density N(H) maps derived from the CO and Hi observations. In the LMC Hi ridge region, the two-velocity Hi components (plus an intermediate velocity component) are identified, and the young massive star cluster is possibly formed by collision between them. In addition, one of the components is suggested to be an inflow gas from the Small Magellanic Cloud (SMC) which is expected to have even lower metallicity gas (Fukui et al. 2017, PASJ, 69, L5). To evaluate dust/gas ratios in the Hi ridge region in detail, we derive the A(V) map from the near-IR color excess of the IRSF data updated with the latest calibration, and fit the resultant A(V) map with a combination of the N(H) maps of the different velocity components to decompose it successfully into the three components. As a result, we find difference by a factor of 2 in A(V)/N(H) between the components. In additon, the CO-to-H-2 conversion factor also indicates difference between the components, implying a difference in the metallicity. Our results are likely to support the scenario that the gas in the LMC Hi ridge region is contaminated with an inflow gas from the SMC with a geometry consistent with the on-going collision between the two-velocity components.
机译：我们使用红外测量设施（IRSF）近红外（IR）数据，在HI Ridge Region中展示了大麦哲伦云（LMC）的灰尘灭火A（V）地图，并将A（V）映射与总计进行比较氢柱密度N（h）衍生自Co和Hi观察的地图。在LMC HI脊区域中，识别了两速度HI组件（加上中间速度分量），并且可能通过它们之间的碰撞形成了年轻的巨大星形簇。此外，建议其中一个部件是来自小麦哲伦云（SMC）的流入气体，该气体预计将具有甚至更低的金属性气体（Fukui等，2017，PASJ，69，L5）。为了详细评估HI RIDGE区域中的灰尘/气体比，我们从最新校准更新的IRSF数据的近红外颜色过量的A（v）映射，并使用一个（v）映射不同速度分量的n（h）映射的组合成功将其分解为三个组件。结果，我们在组件之间的A（v）/ n（h）中发现了2的差异。在附接属中，副到H-2转换因子还表明组件之间的差异，这意味着金属性差异。我们的结果可能支持LMC HI脊区域中的气体的情况被来自SMC的流入气体污染，几何形状与双速分量之间的持续碰撞一致。

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