Bolocam Galactic Plane Survey。VIII。一种中红外运动距离识别方法
The Bolocam Galactic Plane Survey. VIII. A Mid-Infrared Kinematic Distance Discrimination Method
摘要：
我们提出了一种新的距离估计方法尘埃连续识别分子云团块。最近的（亚）毫米银河平面调查已经编目了数万个这样的物体，但对其物理特性的详细研究需要可靠的距离测定。我们推导出贝叶斯距离概率密度函数（DPDF）的770个对象从Bolocam银河平面调查在经度范围7.5 < l < 65。DPDF形式主义是基于运动学距离，并使用外部数据集放置先验距离概率，以解决运动学距离模糊（KDA）的对象在银河系内部。我们目前的先验知识与致密分子区尘埃的中红外吸收和分子气体的银河系分布有关。通过假设银河系中红外辐射的数值模型和简单的辐射转移，我们匹配的毫米热尘埃发射的形态与中红外吸收计算距离歧视的先验DPDF。首先从（亚）毫米源目录中选择对象，避免了对最暗红外暗云（IRDC）的偏见，并扩展了中红外消光探测的日心距离和对比度范围。我们推导出618个分子云团簇的约束良好的KDA分辨率，其中大约15%位于切向距离或超出切向距离。暗到足以被编目为IRDC的天体通常位于近运动学距离处。与银河环巡天KDA分辨率的距离比较产生了92%的一致性，银河正面视图显示了人马座和盾牌-半人马座臂的部分。这种KDA分辨率的方法，通过结合（亚）毫米和中红外观测的分子云团块的大目录的来源，一般适用于其他尘埃连续星系平面调查。
英文摘要：
We present a new distance estimation method for dust-continuum-identified molecular cloud clumps. Recent (sub-)millimeter Galactic plane surveys have cataloged tens of thousands of these objects, but detailed study of their physical properties requires robust distance determinations. We derive Bayesian distance probability density functions (DPDFs) for 770 objects from the Bolocam Galactic Plane Survey in the longitude range 7.5 < l < 65. The DPDF formalism is based on kinematic distances, and uses external data sets to place prior distance probabilities to resolve the kinematic distance ambiguity (KDA) for objects in the inner Galaxy. We present priors related to the mid-infrared absorption of dust in dense molecular regions and the Galactic distribution of molecular gas. By assuming a numerical model of Galactic mid-infrared emission and simple radiative transfer, we match the morphology of millimeter thermal dust emission with mid-infrared absorption to compute a prior DPDF for distance discrimination. Selecting objects first from (sub-)millimeter source catalogs avoids a bias towards the darkest infrared dark clouds (IRDCs) and extends the range of heliocentric distance and contrast range probed by mid-infrared extinction. We derive well-constrained KDA resolutions for 618 molecular cloud clumps, with approximately 15% placed at or beyond the tangent distance. Objects sufficiently dark to be cataloged as IRDCs are generally placed at the near kinematic distance. Distance comparisons with Galactic Ring Survey KDA resolutions yield a 92% agreement, and a Galactic face-on view reveals sections of the Sagittarius and Scutum-Centaurus Arms. This KDA-resolution method for large catalogs of sources through the combination of (sub-)millimeter and mid-infrared observations of molecular cloud clumps is generally applicable to other dust-continuum Galactic plane surveys.
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