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• W2731592583 abstract "We present the first detailed study of the behaviour of the stellar proper motion across the entire Galactic Anti-centre area visible in the Sloan Digital Sky Survey data. We use recalibrated SDSS astrometry in combination with positions from {it Gaia} DR1 to provide tangential motion measurements with a systematic uncertainty $<$5 kms$^{-1}$ for the Main Sequence stars at the distance of the Monoceros Ring. We demonstrate that Monoceros members rotate around the Galaxy with azimuthal speeds of ~230 kms$^{-1}$, only slightly lower than that of the Sun. Additionally, both vertical and azimuthal components of their motion are shown to vary considerably but gradually as a function of Galactic longitude and latitude. The stellar over-density in the Anti-centre region can be split into two components, the narrow, stream-like ACS and the smooth Ring. According to our analysis, these two structures show very similar but clearly distinct kinematic trends, which can be summarised as follows: the amplitude of the velocity variation in $v_{phi}$ and $v_z$ in the ACS is higher compared to the Ring, whose velocity gradients appear to be flatter. Currently, no model available can explain the entirety of the data in this area of the sky. However, the new accurate kinematic map introduced here should provide strong constraints on the genesis of the Monoceros Ring and the associated sub-structure." @default.
• W2731592583 created "2017-07-14" @default.
• W2731592583 creator A5016475989 @default.
• W2731592583 creator A5069727845 @default.
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• W2731592583 date "2017-09-15" @default.
• W2731592583 modified "2023-10-14" @default.
• W2731592583 title "The fall of the Northern Unicorn: tangential motions in the Galactic anticentre with SDSS and Gaia" @default.
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• W2731592583 doi "https://doi.org/10.1093/mnras/stx2391" @default.
• W2731592583 hasPublicationYear "2017" @default.
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