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A Case against a Significant Detection of Precession in the Galactic Warp

Chrobáková; López-Corredoira, M; (2021) A Case against a Significant Detection of Precession in the Galactic Warp. The Astrophysical Journal , 912 (2) , Article 130. 10.3847/1538-4357/abf356. Green open access

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Abstract

Recent studies of warp kinematics using Gaia DR2 data have produced detections of warp precession for the first time, which greatly exceeds theoretical predictions of models. However, this detection assumes a warp model derived for a young population (few tens of megayears) to fit velocities of an average older stellar population of the thin disk (several gigayears) in Gaia-DR2 observations, which may lead to unaccounted systematic errors. Here, we recalculate the warp precession with the same approach and Gaia DR2 kinematic data, but using different warp parameters based on the fit of star counts of the Gaia DR2 sample, which has a much lower warp amplitude than the young population. When we take into account this variation of the warp amplitude with the age of the population, we find that there is no need for precession. We find the value of warp precession β = 4-4+6 km s-1 kpc-1, which does not exclude nonprecessing warp.

Type: Article
Title: A Case against a Significant Detection of Precession in the Galactic Warp
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/1538-4357/abf356
Publisher version: https://doi.org/10.3847/1538-4357/abf356
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
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/10202957
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