THE BOLOCAM GALACTIC PLANE SURVEY. XII. DISTANCE CATALOG EXPANSION USING KINEMATIC ISOLATION OF DENSE MOLECULAR CLOUD STRUCTURES WITH 13CO(1–0)
THE BOLOCAM GALACTIC PLANE SURVEY. XII. DISTANCE CATALOG EXPANSION USING KINEMATIC ISOLATION OF DENSE MOLECULAR CLOUD STRUCTURES WITH 13CO(1–0)
复制标题
DOI：
10.1088/0004-637x/799/1/29
复制
发表时间：
2014-11
期刊：
影响因子：
--
通讯作者：
T. Ellsworth-Bowers;E. Rosolowsky;J. Glenn;A. Ginsburg;N. Evans II;C. Battersby;Y. Shirley;B. Svoboda
中科院分区：
文献类型：
--
作者：
T. Ellsworth-Bowers;E. Rosolowsky;J. Glenn;A. Ginsburg;N. Evans II;C. Battersby;Y. Shirley;B. Svoboda
我们提出了在Bolocam银河平面测量（BGPS）版本2中发现的1710个分子云结构的扩展距离表，比之前的BGPS距离表增加了近三倍。我们还提出了一种将现有数据集纳入贝叶斯距离概率密度函数（DPDF）方法的新方法。为了增加用于导出运动距离的视距速度的致密气体示踪剂(例如，HCO(3-2), NH3(1,1))，我们利用银河系环调查（GRS） 13CO（1 - 0）数据从形态学上提取BGPS源的速度。利用BGPS源轮廓选择GRS 13CO数据的一个区域，与一个参考区域相减包络漫射，得到与BGPS源匹配的13CO线轮廓。对于速度为HCO（3-2）的天体，新的13CO（1-0）速度约有95%与致密气体的速度一致。提出了一种新的运动距离模糊（KDA）分辨率的先验DPDF，该方法基于一种有效的将分子云结构与文献中已知物体相关联的形式。我们先前使用具有三角视差的脉泽表和具有鲁棒KDA分辨率的H区来证明这一点。这里给出的距离目录包含了对20%的BGPS V2源的良好约束的距离估计，典型的距离不确定性为0.5 kpc。大约75%的良好约束源位于距离太阳6kpc的范围内，集中在人马座臂上。星系中心位置的天体还在银河系第一象限和第二象限的人马座、英仙座和外旋臂上留下了痕迹，我们还发现了臂间密集气体的重要区域的证据。
We present an expanded distance catalog for 1710 molecular cloud structures identified in the Bolocam Galactic Plane Survey (BGPS) version 2, representing a nearly threefold increase over the previous BGPS distance catalog. We additionally present a new method for incorporating extant data sets into our Bayesian distance probability density function (DPDF) methodology. To augment the dense-gas tracers (e.g., HCO(3–2), NH3(1,1)) used to derive line-of-sight velocities for kinematic distances, we utilize the Galactic Ring Survey (GRS) 13CO(1–0) data to morphologically extract velocities for BGPS sources. The outline of a BGPS source is used to select a region of the GRS 13CO data, along with a reference region to subtract enveloping diffuse emission, to produce a line profile of 13CO matched to the BGPS source. For objects with a HCO(3–2) velocity, ≈95% of the new 13CO(1–0) velocities agree with that of the dense gas. A new prior DPDF for kinematic distance ambiguity (KDA) resolution, based on a validated formalism for associating molecular cloud structures with known objects from the literature, is presented. We demonstrate this prior using catalogs of masers with trigonometric parallaxes and H ii regions with robust KDA resolutions. The distance catalog presented here contains well-constrained distance estimates for 20% of BGPS V2 sources, with typical distance uncertainties ≲ 0.5 kpc. Approximately 75% of the well-constrained sources lie within 6 kpc of the Sun, concentrated in the Scutum–Centaurus arm. Galactocentric positions of objects additionally trace out portions of the Sagittarius, Perseus, and Outer arms in the first and second Galactic quadrants, and we also find evidence for significant regions of interarm dense gas.