Semczuk, M;
Dehnen, W;
Schönrich, R;
Athanassoula, E;
(2021)
The small boxy/peanut structure of the Milky Way traced by old stars.
Monthly Notices of the Royal Astronomical Society
10.1093/mnras/stab3294.
(In press).
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Abstract
We analyse the positions of RR Lyrae stars in the central region of the Milky Way. In addition to the overall bar shape detected previously, we find evidence for a peanut shaped structure, in form of overdensities near ℓ = −2○ and 1○ at b ∼ −3.5○. The corresponding physical distance between the two peaks of the peanut is ∼0.7 kpc, significantly shorter than that found from near-IR images (3.3 kpc) and red-clump stars. Qualitatively this is expected from ‘fractionation’ of bar orbits, which we demonstrate to be matched in a simulation of an inside-out growing disc subsequently forming a bar.
Type: | Article |
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Title: | The small boxy/peanut structure of the Milky Way traced by old stars |
Open access status: | An open access version is available from UCL Discovery |
DOI: | 10.1093/mnras/stab3294 |
Publisher version: | http://dx.doi.org/10.1093/mnras/stab3294 |
Language: | English |
Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
Keywords: | Galaxy: bulge, Galaxy: structure, Galaxy: evolution, stars: variables: RR Lyrae |
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/10139545 |
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