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• W3208237404 endingPage "4848" @default.
• W3208237404 startingPage "4829" @default.
• W3208237404 abstract "We use an $N$-body+smoothed particle hydrodynamics simulation of an isolated barred galaxy to study the age dependence of bulge longitudinal proper motion ($mu_l$) rotation curves. We show that close to the minor axis ($|l| sim 0^circ$) the relatively young stars rotate more rapidly than the old stars, as found by Hubble Space Telescope in the Milky Way's (MW's) bulge. This behaviour would be expected also if the MW were unbarred. At larger $|l|$ a different behaviour emerges. Because younger stars trace a strong bar, their galactocentric radial motions dominate their $mu_l$ at $|l| sim 6^circ$, leading to a reversal in the sign of $left< mu_l right>$. This results in a rotation curve with forbidden velocities (negative $left< mu_l right>$ at positive longitudes, and positive $left< mu_l right>$ at negative longitudes). The old stars, instead, trace a much weaker bar and thus their kinematics are more axisymmetric, resulting in no forbidden velocities. We develop metrics of the difference in the $left< mu_l right>$ rotation curves of young and old stars, and forbidden velocities. We use these to predict the locations where rotation curve reversals can be observed by HST and the Vera Rubin Telescope. Such measurements would represent support for the amplitude of the bar being a continuous function of age, as predicted by kinematic fractionation, in which the bar strength variations are produced purely by differences in the random motions of stellar populations at bar formation." @default.
• W3208237404 created "2021-11-08" @default.
• W3208237404 creator A5002224962 @default.
• W3208237404 creator A5003329537 @default.
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• W3208237404 creator A5019515072 @default.
• W3208237404 creator A5054941395 @default.
• W3208237404 creator A5062868910 @default.
• W3208237404 creator A5083012035 @default.
• W3208237404 date "2021-11-03" @default.
• W3208237404 modified "2023-09-26" @default.
• W3208237404 title "Predicted trends in Milky Way bulge proper motion rotation curves: future prospects for <i>HST</i> and LSST" @default.
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