Milky Way’s warped disc traced by AGB stars
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ID: 317489
2026
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Abstract
Abstract While the presence of the Galactic warp has long been established from observations of H I gas, the Gaia measurements of over 1 billion stars with parallaxes have enabled much more detailed studies using stellar populations. Here, we demonstrate that asymptotic giant branch (AGB) stars, an evolved phase of low- and intermediate-mass stars, can serve as an effective tracer of the Galactic warp. We use two distinct AGB populations: C-rich AGB stars, representing stars of about 1 Gyr in age with main-sequence masses of 2–2.5 M⊙, and intermediate-mass (3–5 M⊙) O-rich AGB stars, corresponding to ages of 100–300 Myr. The downward warp traced by O-rich AGB stars is consistent with that found from Cepheids, which is expected given their similar ages. The more numerous C-rich AGB stars clearly reveal the Galactic warp over a wide range of azimuthal angles. Their warp appears to reach larger amplitudes than that of Cepheids across azimuthal angles. Our results show that C-rich AGB stars, together with intermediate-mass O-rich AGB stars, provide new constraints on the Galactic warp at intermediate stellar ages, offering a new insight into the stellar age and warp amplitude relation.
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| Authors | Tanya Kushwahaa, M. Matsuura, John Douglas Hunt, Daisuke Kawata, R. Wesson, Timothy A. Davis |
| Journal | monthly notices of the royal astronomical society |
| Year | 2026 |
| DOI |
10.1093/mnras/stag1130
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| URL | |
| Keywords | Keywords not found |
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