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dc.contributor.authorPeterken, Thomas
dc.contributor.authorMerrifield, Michael
dc.contributor.authorAragón-Salamanca, Alfonso
dc.contributor.authorDrory, Niv
dc.contributor.authorKrawczyk, Coleman
dc.contributor.authorMasters, Karen
dc.contributor.authorWeijmans, Anne-Marie
dc.contributor.authorWestfall, Kyle
dc.identifier.citationPeterken , T , Merrifield , M , Aragón-Salamanca , A , Drory , N , Krawczyk , C , Masters , K , Weijmans , A-M & Westfall , K 2019 , ' A direct test of density wave theory in a grand-design spiral galaxy ' , Nature Astronomy , vol. 3 , pp. 178-182 .
dc.identifier.otherPURE: 255967301
dc.identifier.otherPURE UUID: 68c39b09-8df3-451f-bdff-1b16640877c7
dc.identifier.otherBibCode: 2018arXiv180908048P
dc.identifier.otherORCID: /0000-0002-5908-6852/work/50743974
dc.identifier.otherScopus: 85061225830
dc.identifier.otherWOS: 000458038800023
dc.description.abstractThe exact nature of the arms of spiral galaxies is still an open question1. It has been widely assumed that spiral arms in galaxies with two distinct symmetrical arms are the products of density waves that propagate around the disk, with the spiral arms being visibly enhanced by the star formation that is triggered as the passing wave compresses gas in the galaxy disk1,2,3. Such a persistent wave would propagate with an approximately constant angular speed, its pattern speed ΩP. The quasi-stationary density wave theory can be tested by measuring this quantity and showing that it does not vary with radius in the galaxy. Unfortunately, this measurement is difficult because ΩP is only indirectly connected to observables such as the stellar rotation speed4,5,6. Here, we use the detailed information on stellar populations of the grand-design spiral galaxy UGC 3825, extracted from spectral mapping, to measure the offset between young stars of a known age and the spiral arm in which they formed, allowing a direct measurement of ΩP at a range of radii. The offset in this galaxy is found to be as expected for a pattern speed that varies little with radius, indicating consistency with a quasi-stationary density wave, and lending credence to this new method.
dc.relation.ispartofNature Astronomyen
dc.rights© 2018, the Author(s) under exclusive licence to Springer Nature Limited. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleA direct test of density wave theory in a grand-design spiral galaxyen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.description.statusPeer revieweden

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