Dynamical heating across the Milky Way disc J/MNRAS/489/176 ivo://CDS.VizieR/J/MNRAS/489/176 doi:10.26093/cds/vizier.74890176 CDS Mackereth J.T. Bovy J. Leung H.W. Schiavon R.P. Trick W.H.,Chaplin W.J. Cunha K. Feuillet D.K. Majewski S.R. Martig M. Miglio A.,Nidever D. Pinsonneault M.H. Silva Aguirre V. Sobeck J. Tayar J.,Zasowski G. 2024-08-20T20:12:41Z 2023-02-09T13:14:10Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr giant-stars stellar-ages milky-way-galaxy astronomical-models visible-astronomy The kinematics of the Milky Way disc as a function of age are well measured at the solar radius, but have not been studied over a wider range of Galactocentric radii. Here, we measure the kinematics of mono-age, mono-[Fe/H] populations in the low and high [{alpha}/Fe] discs between 4~<R~<13kpc and |z|~<2kpc using 65719 stars in common between APOGEE DR14 and Gaia DR2 for which we estimate ages using a Bayesian neural network model trained on asteroseismic ages. We determine the vertical and radial velocity dispersions, finding that the low and high [{alpha}/Fe] discs display markedly different age-velocity dispersion relations (AVRs) and shapes {sigma}_z_/{sigma}_R_. The high [{alpha}/Fe] disc has roughly flat AVRs and constant {sigma}_z_/{sigma}_R_=0.64+/-0.04, whereas the low [{alpha}/Fe] disc has large variations in this ratio that positively correlate with the mean orbital radius of the population at fixed age. The high [{alpha}/Fe] disc component's flat AVRs and constant {sigma}_z_/{sigma}_R_ clearly indicate an entirely different heating history. Outer disc populations also have flatter radial AVRs than those in the inner disc, likely due to the waning effect of spiral arms. Our detailed measurements of AVRs and {sigma}_z_/{sigma}_R_ across the disc indicate that low [{alpha}/Fe], inner disc (R~<10kpc) stellar populations are likely dynamically heated by both giant molecular clouds and spiral arms, while the observed trends for outer disc populations require a significant contribution from another heating mechanism such as satellite perturbations. We also find that outer disc populations have slightly positive mean vertical and radial velocities likely because they are part of the warped disc. 2019MNRAS.489..176M https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/489/176 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to I/345 : Gaia DR2 (Gaia Collaboration, 2018) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/489/176 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/489/176 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/489/176 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/489/176 https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/489/176 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/489/176 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/MNRAS/489/176/dr14ages (Estimating ages for red giant stars using bayesian convolutional neural networks) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/489/176/dr14ages? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/489/176/dr14ages? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/489/176/dr14ages? 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27022-27023 27026 27029 27032-27034 27045 27056-27057 27072-27073 27089 27091 27124 27126-27129 27131-27134 27168 27170 27176 27227-27228 27230-27231 27249 27402 27424 27426 27479 27481 27508-27509 27519 27605 27607 27629 27636 27638 27640-27641 27644 27656 27658 27667-27668 27670-27671 27673 27680 27720 27857 27859 27867-27868 27888-27889 27891 27897 27905 27913 27916-27917 27922 27938 27968-27969 28032-28033 28064 28066-28067 28123 28125-28127 28139 28148-28149 28168 28170 28192 28202 28241 28252-28253 28270-28271 28286 28292 28294 28296-28297 28300 28318-28319 28321 28323 28329 28338 28341 28343-28344 28355-28356 28358-28359 28372 28384 28386 28416 28418 28462-28463 28474 28484 28486 28489 28492 28545 28547 28556 28560 28618-28619 28622 28625 28627 28633 28635 28637-28638 28646 28649 28727 28733 28735 28757-28759 28764-28765 28770 28794 28813 28815 28824 28826 28837-28839 28843 28845-28847 28857-28861 28863 28876-28878 28896-28898 28900 28902 28904-28906 28912 28914-28915 28928-28929 28932 28941 28943 28952 29066-29067 29070-29071 29088-29089 29097-29099 29108 29110-29111 29154 29158 29178-29179 29181-29185 29187-29190 29199 29201 29203 29210-29213 29221 29230-29233 29242 29249-29251 29254 29256-29257 29265 29269 29274 29284-29285 29287 29296 29298-29299 29328 29336 29345 29440-29441 29453 29464-29465 29516-29518 29521-29523 29537 29540 29557-29559 29561 29563 29621 29623 29629 29631-29633 29635-29638 29676 29692 29694-29695 29741-29743 29828-29829 29840-29841 29845 29847 29855 29864 29866-29867 29869-29871 29882-29883 29894 29896-29897 29900-29901 29903 29912-29913 29915-29916 29918 29928-29930 29936 29940 29951 30029 30031 30034-30035 30037 30044 30046 30053 30064-30065 30122 30141 30143 30178 30190-30191 30202-30203 30216 30218-30220 30222-30223 30233 30240-30241 30254 30264-30265 30267-30270 30272 30274 30280 30292-30293 30295 30299 30301-30303 30307 30310 30321 30323 30330-30332 30334 30358 30360-30362 30364 30380-30381 30383 30389 30391-30394 30401 30404-30405 30416-30418 30426-30427 30440-30441 30452 30454 30456-30457 30472-30474 30485 30496 30498 30524-30525 30527-30529 30531-30533 30535 30548 30550 30552-30553 30556 30560 30562-30563 30568-30570 30617-30619 30640-30641 30643-30646 30667 30670 30675 30677-30679 30681 30697 30700-30701 30706-30707 30710-30713 30715 30746-30747 30757 30759 30772 30774 30776-30777 30780 30881 30883 30941 30966-30967 31056-31057 31059-31062 31112-31113 31116 31118 31137-31139 31317 31372 31374 31392-31393 31395 31404-31405 31414 31420 31422 31445-31447 31452-31453 31488-31489 31580 31582-31583 31600-31601 31603-31606 31616 31618 31624-31626 31745 31747 31753 31762 31768 31796-31797 31818 31840 32005-32007 32013 32029-32030 32041-32043 32053 32058 32066 32071 32077-32079 32082-32083 32092 32094 32096-32098 32112-32113 32129 32131 32144-32145 32147 32153 32156-32158 32451 32464 32466 32472 32474 32478 32497 32499 32505 32508-32509 32511 32672 32674 32680 32683 32701-32703 32744 32746-32747 36343 36349-36351 36439 36447 36517 36519 36521 36525 36530 36538 36611 36616-36618 36620 36651 36654-36655 36737 36739-36741 36743 36774-36775 36784 36786-36787 36792 36794 39915 39918-39919 39933 39935 40610-40611 40622 40625 40627 40633 40655 40666-40667 40670 40674 40677 40679-40680 40692 40694 40696-40697 40737-40740 40742-40743 40798-40799 40817 40819 40828-40829 44719 44730-44731 44959 44981 44986 45000 45002-45003 45024-45025 47869 47871 48033-48035 48056 49143 49149 49151 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/489/176?format=ascii Optical default J/MNRAS/489/176/dr14ages Estimating ages for red giant stars using bayesian convolutional neural networks Simbad Simbad column added by the CDS meta.ref.url char recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int Name Star name (2MHHMMSSss+DDMMSSs) meta.id;meta.main char aNNage Star age from astroNN model Gyr time.age double e_aNNage Error on aNNage (1) Gyr stat.error double predstd astroNN predictive error on age Gyr stat.error double modelstd astroNN model error on age Gyr stat.error double _RA Position from Name (right ascension part) deg pos.eq.ra;meta.main indexed _DE Position from Name (declination part) deg pos.eq.dec;meta.main indexed