dc.contributor.author Rodgers-Lee, D. dc.contributor.author Krause, M. G. H. dc.contributor.author Dale, J. dc.contributor.author Diehl, R. dc.date.accessioned 2019-10-26T00:09:19Z dc.date.available 2019-10-26T00:09:19Z dc.date.issued 2019-10-03 dc.identifier.citation Rodgers-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.issn 0035-8711 dc.identifier.other PURE: 17433445 dc.identifier.other PURE UUID: b3970d92-9c6e-4bcd-a011-4da79c167560 dc.identifier.other ArXiv: http://arxiv.org/abs/1909.10978v1 dc.identifier.other ORCID: /0000-0002-9610-5629/work/63687381 dc.identifier.other ORCID: /0000-0001-5252-5771/work/63687423 dc.identifier.other Scopus: 85079626316 dc.identifier.uri http://hdl.handle.net/2299/21799 dc.description © 2019 The Author(s). dc.description.abstract Emission 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.extent 19 dc.language.iso eng dc.relation.ispartof Monthly Notices of the Royal Astronomical Society dc.subject astro-ph.GA dc.title Synthetic 26Al emission from galactic-scale superbubble simulations en dc.contributor.institution School of Physics, Astronomy and Mathematics dc.contributor.institution Centre for Astrophysics Research dc.description.status Peer reviewed rioxxterms.version AM rioxxterms.versionofrecord https://doi.org/10.1093/mnras/stz2708 rioxxterms.type Journal Article/Review herts.preservation.rarelyaccessed true
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