UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

The small boxy/peanut structure of the Milky Way traced by old stars

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). Green open access

[thumbnail of stab3294.pdf]
Preview
Text
stab3294.pdf - Accepted Version

Download (564kB) | Preview

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
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
Downloads since deposit
Loading...
35Downloads
Download activity - last month
Loading...
Download activity - last 12 months
Loading...
Downloads by country - last 12 months
Loading...

Archive Staff Only

View Item View Item