Local kinematics and the local standard of rest

By R. Schönrich, J. Binney, W. Dehnen. 2009

1,337 citations recorded by the source corpus.

We re-examine the stellar kinematics of the solar neighbourhood in terms of the velocity υ� of the Sun with respect to the local standard of rest. We show that the classical determination of its component Vin the direction of Galactic rotation via Str¨ omberg's relation is undermined by the metallicity gradient in the disc, which introduces a correlation between the colour of a group of stars and the radial gradients of its properties. Comparing the local stellar kinematics to a chemodynamical model which accounts for these effects, we obtain (U, V, W)� = (11.1 +0.69 −0.75 , 12.24 +0.47 −0.47 ,7 .25 +0.37 −0.36 )k m s −1 , with additional systematic uncertainties ∼(1, 2, 0.5) km s −1 . In particular, Vis 7 km s −1 larger than previously estimated. The new values of (U, V, W)� are extremely insensitive to the metallicity gradient within the disc.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/85f906f1f0989615b3c4a3ca299b688f13c83953

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Citations in the corpus

`Skinny Milky Way please', says Sagittarius (2014, methodology): “For the peculiar motion of the Sun with respect to the Local Standard of Rest (LSR), we take (U, V,W ) = (11.1, 12.24, 7.25) kms−1 from Schönrich et al. (2010).”
Evidence for an Intermediate-mass Milky Way from Gaia DR2 Halo Globular Cluster Motions (2018, methodology): “For the solar peculiar velocity relative to the Local Standard of Rest, we assume Vpec = (11.10±1.23, 12.24±2.05, 7.25±0.62) km s−1 (Schönrich et al. 2010).”
The Galaxy in Context: Structural, Kinematic, and Integrated Properties (2016, background): “V was later revised upward close to the original value (Binney 2010, Schönrich et al. 2010); the latter paper showed that Strömberg’s linear asymmetric drift relation is invalidated by the metallicity gradient in the disk.”
STARS, GAS, AND DARK MATTER IN THE SOLAR NEIGHBORHOOD (2015, background): “…to maintain a half-period of about 30 Myr; the numerical values of the Shaviv et al. (2014) 9 If the Sun has a vertical velocity of 7.25 km s 1- (Schönrich et al. 2010) and is 14 pc above the midplane (Binney et al. 1997), then the amplitude of the solar oscillation about the midplane is P72 1…”
The Sausage Globular Clusters (2018, methodology): “…to the Galactic rest-frame, we use the circular speed of 232.8 kms−1 at the Sun’s position of 8.2 kpc, consistent with the McMillan (2017) potential, whilst for the Solar peculiar motion we use the most recent value from Schönrich et al. (2010), namely (U, V,W ) = (11.1, 12.24, 7.25) kms−1.”
The mass distribution and gravitational potential of the Milky Way (2016, methodology): “…a R0 in an axisymmetric approximation of the true potential (i.e. what we find in this study), and the velocity of a closed orbit,and therefore a theoretical 0 km s−1 dispersion population, in the Solar neighbourhood (which is what is found by local measurementslike that of Schönrich et al. 2010).”