Local Group距离的聚类:发表偏倚还是相关测量?五、银河系自转常数
Clustering of Local Group distances: publication bias or correlated measurements? V. Galactic rotation constants
摘要:
作为一个广泛的数据挖掘工作的一部分,我们已经编制了一个数据库的162个银河系旋转速度测量在$R_0$(太阳银河系中心距离),$Θ_0$。这是自1985年Meta分析以来最全面的一组$Θ_0$值,该荟萃分析导致了国际天文学联合会推荐的银河系旋转常数的最后一次修订。虽然我们没有发现任何令人信服的证据存在的“发表偏倚”在最近几十年,我们发现明显的差异$Θ_0$值和$Θ_0/R_0$比率导致使用不同的示踪剂人口。特别是,年轻的示踪星(包括OB和超巨星,脉泽,造父变星,H{ \sc ii}区域和年轻的疏散星团),以及银河系中心附近的Sgr A* 的运动学测量,意味着太阳圈处的银河系旋转速度明显更大,并且具有更高的$Θ_0/R_0$比率(即,$Θ_0 = 247 \pm 3$ km s $^{-1}$和$Θ_0/R_0 = 29.81 \pm 0.32$ km s $^{-1}$ kpc $^{-1}$ ;仅统计不确定性)比任何主导银河系质量预算的示踪剂(即,场星和H{ \sc i}/CO分布)。使用后者作为银河系大部分物质分布的最具代表性,我们得到了一组更新的银河系旋转常数$Θ_0 = 225 \pm 3 \mbox{ (statistical)} \pm 10 \mbox{ (systematic) km s}^{-1}$、$R_0 = 8.3 \pm 0.2 \mbox{ (statistical)} \pm 0.4 \mbox{ (systematic) kpc}$和$Θ_0 / R_0 = 27.12 \pm 0.39 \mbox{ (statistical)} \pm 1.78 \mbox{ (systematic) km s}^{-1} \mbox{ kpc}^{-1}$。
英文摘要:
As part of on an extensive data mining effort, we have compiled a database of 162 Galactic rotation speed measurements at $R_0$ (the solar Galactocentric distance), $Θ_0$. Published between 1927 and 2017 June, this represents the most comprehensive set of $Θ_0$ values since the 1985 meta analysis that led to the last revision of the International Astronomical Union's recommended Galactic rotation constants. Although we do not find any compelling evidence of the presence of `publication bias' in recent decades, we find clear differences among the $Θ_0$ values and the $Θ_0/R_0$ ratios resulting from the use of different tracer populations. Specifically, young tracers (including OB and supergiant stars, masers, Cepheid variables, H{\sc ii} regions, and young open clusters), as well as kinematic measurements of Sgr A* near the Galactic Center, imply a significantly larger Galactic rotation speed at the solar circle and a higher $Θ_0/R_0$ ratio (i.e., $Θ_0 = 247 \pm 3$ km s$^{-1}$ and $Θ_0/R_0 = 29.81 \pm 0.32$ km s$^{-1}$ kpc$^{-1}$; statistical uncertainties only) than any of the tracers dominating the Galaxy's mass budget (i.e., field stars and the H{\sc i}/CO distributions). Using the latter as most representative of the bulk of the Galaxy's matter distribution, we arrive at an updated set of Galactic rotation constants, $Θ_0 = 225 \pm 3 \mbox{ (statistical)} \pm 10 \mbox{ (systematic) km s}^{-1}$, $R_0 = 8.3 \pm 0.2 \mbox{ (statistical)} \pm 0.4 \mbox{ (systematic) kpc}$, and $Θ_0 / R_0 = 27.12 \pm 0.39 \mbox{ (statistical)} \pm 1.78 \mbox{ (systematic) km s}^{-1} \mbox{ kpc}^{-1}$.
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