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Atlas and Catalog of Dark Clouds Based on the 2 Micron All Sky Survey

机译：基于2微米全天候调查的暗云图集和目录

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This paper presents an atlas and catalog of dark clouds derived based on the 2 Micron All Sky Survey Point Source Catalog (2MASS PSC). Color excess maps of E(J - H) and E(H -KS) as well as extinction maps of AJ, AH, and AKS covering all of the sky have been produced at the 10 grid with a changing angular resolution (10-120), depending on the regions in the sky. Maps drawn at the lower 150 grid with a fixed 1? resolution were also derived for various sets of threshold magnitudes in the J, H, and KS bands to estimate the background star colors and star densities needed to derive the color excess and extinction maps. The maps obtained in this work are presented on various scales in a series of figures that can be used as an atlas of dark clouds for general research purposes. On the basis of the E(J - H) and AJ maps drawn at the 10 grid, we have carried out a systematic survey for dark clouds all over the sky. In total, we identified 7614 dark clouds, and measured the coordinates, extents, and AV values for each of them. We also searched for their counterparts in a previously published catalog of dark clouds based on the optical photographic plates DSS (Dobashi et al. 2005, PASJ, 57, S1). These cloud parameters, including the information of the counterparts, are compiled into a new catalog of dark clouds. The atlas and catalog organized in this paper mainly trace relatively dense regions in dark clouds, revealing a number of dense cloud cores leading to star formation, while those presented by Dobashi et al. based on the optical database are more suited to trace less-dense regions and to reveal the global extents of dark clouds. These two datasets are complementary, and all together, they are useful to picture the structures of dark clouds in various density ranges.
机译：本文介绍了基于2 Micron All Sky Survey Point源目录（2MASS PSC）得出的暗云地图集和目录。 E（J-H）和E（H-KS）的彩色过剩贴图以及覆盖所有天空的AJ，AH和AKS的消光贴图都是在10格处以变化的角分辨率绘制的（10-120 ），具体取决于天空中的区域。在较低的150格处以固定1绘制的地图？还针对J，H和KS波段中的各种阈值幅度集合推导了分辨率，以估算背景恒星的颜色和恒星密度，以得出颜色过量和消光图。在这项工作中获得的地图以一系列比例以各种比例显示，可以用作一般研究目的的暗云图集。根据在10格处绘制的E（J-H）和AJ地图，我们对天空中的暗云进行了系统的测量。总共，我们确定了7614个暗云，并测量了每个暗云的坐标，范围和AV值。我们还根据光学照相板DSS在先前发布的乌云目录中搜索了它们的对应物（Dobashi等，2005，PASJ，57，S1）。这些云参数，包括对应的信息，被编译成新的暗云目录。本文组织的地图集和目录主要描绘了乌云中相对密集的区域，揭示了许多致密的云核导致恒星形成，而Dobashi等人则提出了这些图集。基于光学数据库的模型更适合于跟踪密度较低的区域并揭示暗云的全球范围。这两个数据集是互补的，并且它们合在一起可用于描绘各种密度范围内的暗云结构。

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