Chrobáková;
Nagy, R;
López-Corredoira, M;
(2022)
Warp and flare of the Galactic disc revealed with supergiants by Gaia EDR3.
Astronomy and Astrophysics
, 664
, Article A58. 10.1051/0004-6361/202243296.
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Abstract
Context. The outer Galactic disc contains some features such as the warp and flare, whose origin is still debated. The Gaia data provide an excellent opportunity to probe the Galactic disc at large distances and study these features. Aims. We derive the density distributions of the average (old) whole population and the supergiants (representative of a young population), and we use them to constrain their warp and flare. By comparing the results, we study how the properties of these phenomena depend on the studied population. Methods. We used Lucy™ s deconvolution method to recover corrected star counts as a function of distance, from which we derive the density distribution. Results. We find that supergiants have an asymmetric warp, reaching a maximum amplitude of zw= 0.658 kpc and minimum amplitude of zw= 0.717 kpc at a distance of R = [19.5, 20] kpc, which is almost twice as high as the amplitude of the whole population of the disc. We find a significant flare of the whole population, especially in the thick disc. The scale height increases from hz,thick0.7 kpc and hz, thin 0.3 kpc in the solar neighbourhood, to hz, thickÂ"2.6 kpc and hz, thinÂ"0.6 kpc in the remote regions of the Milky Way (R≈18 kpc). The supergiants™ population has only a small flare.
Type: | Article |
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Title: | Warp and flare of the Galactic disc revealed with supergiants by Gaia EDR3 |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1051/0004-6361/202243296 |
Publisher version: | https://doi.org/10.1051/0004-6361/202243296 |
Language: | English |
Additional information: | Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
Keywords: | Galaxy: disk – Galaxy: structure |
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-pp.ucl.ac.uk/id/eprint/10202956 |
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