论文标题
两个红外云的X射线景观G034.43+00.24和G035.39-00.33
An X-ray View of Two Infrared Dark Clouds G034.43+00.24 and G035.39-00.33
论文作者
论文摘要
我们提出了两种红外乌云（IRDC），G034.43+00.24和G035.39-00.33的高空间分辨率研究，预计将处于星团形成的早期阶段。我们分别检测到G034.43+00.24和G035.39-00.33的112和209有效X射线点源。我们将X射线点源与2个质量，瞥见和明智的目录交叉匹配，并在G034.43+00.24和G035.39-00.33中找到了X射线源的53％和59％，分别为相应的红外同行。这些来源可能是年轻大型群集形成的成员，使用恒星等线龙，我们估计两个IRDC中都有1--2 Myr旧的人口至中间至较高的年轻恒星物体（YSO）。在G034.43+00.24和G035.39-00.33中分别确定了与X射线源的两个和十级与X射线源的同行，分别位于深色细丝中或附近。 G035.39-00.33的X射线光度函数（XLF）意味着总质量由$ \ sim1,700 \：m_ \ odot $组成，使用了精心研究的Orion Nebula nebula cluster作为校准器。这对应于最多5％的恒星形成效率，这表明该系统仍然非常主导，并且在恒星形成过程的早期阶段。 G034.43+00.24的种群由于其观察值的敏感性较低而确定得不太确定。
We present a high spatial resolution Chandra X-ray study of two Infrared Dark Clouds (IRDCs), G034.43+00.24 and G035.39-00.33, which are expected to be in the early phases of star cluster formation. We detect 112 and 209 valid X-ray point sources towards G034.43+00.24 and G035.39-00.33, respectively. We cross-match the X-ray point sources with 2MASS, GLIMPSE and WISE catalogs and find 53% and 59% of the X-ray sources in G034.43+00.24 and in G035.39-00.33 have corresponding infrared counterparts, respectively. These sources are probable members of young massive clusters in formation, and using stellar isochrones we estimate that a population of 1--2 Myr old, intermediate to high mass young stellar objects (YSOs) exist in both IRDCs. Two and ten Class II counterparts to X-ray sources were identified in G034.43+00.24 and in G035.39-00.33, respectively, which are located in or near dark filaments. The X-ray Luminosity Function (XLF) of G035.39-00.33 implies that the total mass consists of up to $\sim1,700\:M_\odot$ of stars, using the XLF of the well-studied Orion Nebula Cluster as calibrator. This corresponds to a star formation efficiency of at most 5%, indicating the system is still very much gas dominated and in an early stage of the star formation process. The population of G034.43+00.24 is less well determined due to the lower sensitivity of its observations.
