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Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VI. Evidence for the Long-lived Nonsteady Warp of Nongravitational Scenarios

Wang, HF; López-Corredoira, M; Huang, Y; Chang, J; Zhang, HW; Carlin, JL; Chen, XD; ... Chen, BQ; + view all (2020) Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VI. Evidence for the Long-lived Nonsteady Warp of Nongravitational Scenarios. The Astrophysical Journal , 897 (2) , Article 119. 10.3847/1538-4357/ab93ad. Green open access

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Abstract

By combining LAMOST DR4 and Gaia DR2 common red clump stars with age and proper motion, we analyze the amplitude evolution of the stellar warp independently of any assumption with a simple model. The greatest height of the warp disk increases with galactocentric distance in different populations and is dependent on age: The younger stellar populations exhibit stronger warp features than the old ones, accompanied by the warp amplitude (age) decreasing with age, and its first derivative g (age) is different from zero. The azimuth of the line of nodes fw is stable at-5 without clear time evolution, which perfectly confirms some previous works. All of this selfconsistent evidence supports that our Galactic warp should most likely be a long-lived but nonsteady structure and not a transient one, which is supporting that the warp originated from gas infall onto the disk or other hypotheses that suppose that the warp mainly affects the gas, and consequently, younger populations tracing the gas are stronger than older ones. In other words, the Galactic warp is induced by the nongravitational interaction over the disk models.

Type: Article
Title: Mapping the Galactic Disk with the LAMOST and Gaia Red Clump Sample. VI. Evidence for the Long-lived Nonsteady Warp of Nongravitational Scenarios
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/1538-4357/ab93ad
Publisher version: https://doi.org/10.3847/1538-4357/ab93ad
Language: English
Additional information: Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10202960
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