The Circular Velocity Curve of the Milky Way from $5$ to $25$ kpc

Abstract

We measure the circular velocity curve $v_{\mathrm{c}}(R)$ of the Milky Way with the highest precision to date across Galactocentric distances of $5\le R\le 25$ kpc. Our analysis draws on the $6$-dimensional phase-space coordinates of $\gtrsim 23,000$ luminous red-giant stars, for which we previously determined precise parallaxes using a data-driven model that combines spectral data from APOGEE with photometric information from WISE, 2MASS, and Gaia. We derive the circular velocity curve with the Jeans equation assuming an axisymmetric gravitational potential. At the location of the Sun we determine the circular velocity with its formal uncertainty to be $v_{\mathrm{c}}(R_{\odot })=(229.0\pm 0.2)\mathrm{km}{\mathrm{s}}^{-1}$ with systematic uncertainties at the $\sim 2-5\%$ level. We find that the velocity curve is gently but significantly declining at $(-1.7\pm 0.1)\mathrm{km}{\mathrm{s}}^{-1}\mathrm{kp}{\mathrm{c}}^{-1}$, with a systematic uncertainty of $0.46\mathrm{km}{\mathrm{s}}^{-1}\mathrm{kp}{\mathrm{c}}^{-1}$, beyond the inner $5$ kpc. We exclude the inner $5$ kpc from our analysis due to the presence of the Galactic bar, which strongly influences the kinematic structure and requires modeling in a non-axisymmetric potential. Combining our results with external measurements of the mass distribution for the baryonic components of the Milky Way from other studies, we estimate the Galaxy's dark halo mass within the virial radius to be $M_{\mathrm{vir}}=(7.25\pm 0.26)\cdot 10^{11}{M}_{\odot }$ and a local dark matter density of ${\rho }_{\mathrm{dm}}(R_{\odot })=0.30\pm 0.03\mathrm{GeV}\mathrm{c}{\mathrm{m}}^{-3}$.

arXiv commentAccepted for publication in ApJ. All data can be downloaded here: https://doi.org/10.5281/zenodo.1468053

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