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dc.contributor.authorRodgers-Lee, D.
dc.contributor.authorKrause, M. G. H.
dc.contributor.authorDale, J.
dc.contributor.authorDiehl, R.
dc.date.accessioned2019-10-26T00:09:19Z
dc.date.available2019-10-26T00:09:19Z
dc.date.issued2019-10-03
dc.identifier.citationRodgers-Lee , D , Krause , M G H , Dale , J & Diehl , R 2019 , ' Synthetic 26 Al emission from galactic-scale superbubble simulations ' , Monthly Notices of the Royal Astronomical Society , vol. 490 , no. 2 , pp. 1894-1912 . https://doi.org/10.1093/mnras/stz2708
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 17433445
dc.identifier.otherPURE UUID: b3970d92-9c6e-4bcd-a011-4da79c167560
dc.identifier.otherArXiv: http://arxiv.org/abs/1909.10978v1
dc.identifier.otherORCID: /0000-0002-9610-5629/work/63687381
dc.identifier.otherORCID: /0000-0001-5252-5771/work/63687423
dc.identifier.otherScopus: 85079626316
dc.identifier.urihttp://hdl.handle.net/2299/21799
dc.description© 2019 The Author(s).
dc.description.abstractEmission from the radioactive trace element 26Al has been observed throughout the Milky Way with the COMPTEL and INTEGRAL satellites. In particular the Doppler shifts measured with INTEGRAL connect 26Al with superbubbles, which may guide 26Al flows off spiral arms in the direction of Galactic rotation. In order to test this paradigm, we have performed galaxy-scale simulations of superbubbles with 26Al injection in a Milky Way-type galaxy. We produce all-sky synthetic $\gamma-$ray emission maps of the simulated galaxies. We find that the 1809keV emission from the radioactive decay of 26Al is highly variable with time and the observer's position. This allows us to estimate an additional systematic variability of 0.2dex for a star formation rate derived from 26Al for different times and measurement locations in Milky Way-type galaxies. High-latitude morphological features indicate nearby emission with correspondingly high integrated gamma-ray intensities. We demonstrate that the 26Al scale height from our simulated galaxies depends on the assumed halo gas density. We present the first synthetic 1809keV longitude-velocity diagrams from 3D hydrodynamic simulations. The line-of-sight velocities for 26Al can be significantly different from the line-of-sight velocities associated with the cold gas. Over time, 26Al velocities consistent with the INTEGRAL observations, within uncertainties, appear at any given longitude, broadly supporting previous suggestions that 26Al injected into expanding superbubbles by massive stars may be responsible for the high velocities found in the INTEGRAL observations. We discuss the effect of systematically varying the location of the superbubbles relative to the spiral arms.en
dc.format.extent19
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectastro-ph.GA
dc.titleSynthetic 26Al emission from galactic-scale superbubble simulationsen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stz2708
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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