Age-morphology dependence of the Milky Way boxy/peanut bulge seen in Mira variables

• Verfasst von: Semczuk, Marcin [VerfasserIn]
• Verfasst von: Dehnen, Walter [VerfasserIn]
• Verfasst von: Schönrich, Ralph [VerfasserIn]
• Verfasst von: Athanassoula, E [VerfasserIn]
• Titel: Age-morphology dependence of the Milky Way boxy/peanut bulge seen in Mira variables
• Verf.angabe: Marcin Semczuk, Walter Dehnen, Ralph Schönrich and E. Athanassoula
• E-Jahr: 2022
• Jahr: 2022 October 28
• Umfang: 4 S.
• Fussnoten: Gesehen am 19.01.2023
• Titel Quelle: Enthalten in: Royal Astronomical SocietyMonthly notices of the Royal Astronomical Society
• Ort Quelle: Oxford : Oxford Univ. Press, 1827
• Jahr Quelle: 2022
• Band/Heft Quelle: 517(2022), 4, Seite 6060-6063
• ISSN Quelle: 1365-2966
• DOI: doi:10.1093/mnras/stac3085
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1831518910

Abstract

We analyse the distribution of Mira variable stars in the central region of the Milky Way. We find that with increasing period, i.e. decreasing age, the Miras shift towards negative Galactic longitudes ℓ. Comparing to a cosmological zoom simulation of a barred galaxy, we find that this shift with age can be explained by an age-morphology dependence of the boxy peanut/bulge. Owing to a combination of projection effects and the limitation of the range of Galactic longitudes, the near hump at ℓ > 0 is more truncated for younger populations, and the far hump at ℓ < 0 dominates the observed distributions.