The Distance to the Perseus Spiral Arm in the Milky Way

Y. Xu, M. J. Reid, X. W. Zheng +1

We have measured the distance to the massive star-forming region W3OH in the Perseus spiral arm of the Milky Way to be 1.95 $\pm$ 0.04 kilo-parsecs ($5.86\times 10^{16}$ km). This d…