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The GALAH survey: velocity fluctuations in the Milky Way using Red Clump giants

Khanna, Shourya; Sharma, Sanjib; Bland-Hawthorn, Joss; Hayden, Michael; Nataf, David M.; Ting, Yuan-Sen; Kos, Janez; Martell, Sarah; Zwitter, T.; De Silva, Gayandhi; Asplund, Martin; Duong, Ly; Lin, Jane; Nordlander, Thomas


If the Galaxy is axisymmetric and in dynamical equilibrium, we expect negligible fluctuations in the residual line-of-sight velocity field. Recent results using the APOGEE survey find significant fluctuations in velocity for stars in the mid-plane (|z| <0.25 kpc) out to 5 kpc, suggesting that the dynamical influence of non-axisymmetric features, i.e. the Milky Way's bar, spiral arms, and merger events extends out to the Solar neighbourhood. Their measured power spectrum has a characteristic...[Show more]

CollectionsANU Research Publications
Date published: 2018-10-30
Type: Journal article
Source: Monthly Notices of the Royal Astronomical Society
DOI: 10.1093/mnras/sty2924
Access Rights: Open Access


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