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The GALAH survey: Stellar streams and how stellar velocity distributions vary with Galactic longitude, hemisphere, and metallicity

Quillen, A. C.; De Silva, Gayandhi; Sharma, Sanjib; Hayden, Michael; Freeman, Kenneth; Bland-Hawthorn, Joss; Žerjal, Maruša; Asplund, Martin; Buder, Sven; D’Orazi, Valentina; Duong, Ly; Kos, Janez; Lin, Jinying (Jane); Lind, K.; Martell, Sarah; Schlesinger, Katharine; Simpson, Jeffrey D.; Casagrande, Luca; Ireland, Michael


Using GALAH (GALactic Archaeology with HERMES) survey data of nearby stars, we look at how structure in the planar (u, v) velocity distribution depends on metallicity and on viewing direction within the Galaxy. In nearby stars with distance d≲1 kpc, the Hercules stream is most strongly seen in higher metallicity stars [Fe/H] > 0.2. The Hercules stream peak v value depends on viewed galactic longitude, which we interpret as due to the gap between the stellar stream and more circular orbits...[Show more]

CollectionsANU Research Publications
Date published: 2018
Type: Journal article
Source: Monthly Notices of the Royal Astronomical Society
DOI: 10.1093/mnras/sty865
Access Rights: Open Access


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