SIMBAD references

2022MNRAS.509.4532S - Mon. Not. R. Astron. Soc., 509, 4532-4537 (2022/January-3)

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

SEMCZUK M., DEHNEN W., SCHONRICH R. and ATHANASSOULA E.

Abstract (from CDS):

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.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): stars: variables: RR Lyrae - Galaxy: bulge - Galaxy: evolution - Galaxy: structure

Simbad objects: 3

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