Clustering of Local Group distances: publication bias or correlated measurements? V. Galactic rotation constants

Abstract

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), ${\Theta }_0$. Published between 1927 and 2017 June, this represents the most comprehensive set of ${\Theta }_0$ 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 ${\Theta }_0$ values and the ${\Theta }_0/R_0$ 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 ${\Theta }_0/R_0$ ratio (i.e., ${\Theta }_0=247\pm 3$ km s${}^{-1}$ and ${\Theta }_0/R_0=29.81\pm 0.32$ 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 $Θ_0 / R_0 = 27.12 \pm 0.39 \mbox{ (statistical)} \pm 1.78 \mbox{ (systematic) km s}^{-1} \mbox{ kpc}^{-1}$.

arXiv comment8 pages, 4 figures; ApJS, in press

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