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dc.contributor.authorPanopoulou, G. V.
dc.contributor.authorClark, S. E.
dc.contributor.authorHacar, A.
dc.contributor.authorHeitsch, F.
dc.contributor.authorKainulainen, J.
dc.contributor.authorNtormousi, E.
dc.contributor.authorSeifried, D.
dc.contributor.authorSmith, R. J.
dc.identifier.citationPanopoulou , G V , Clark , S E , Hacar , A , Heitsch , F , Kainulainen , J , Ntormousi , E , Seifried , D & Smith , R J 2022 , ' The width of Herschel filaments varies with distance ' , Astronomy & Astrophysics , vol. 657 , L13 .
dc.descriptionFunding: This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. 851435). R.J.S. gratefully acknowledges an STFC Ernest Rutherford fellowship (grant ST/N00485X/1).en
dc.description.abstractContext. Filamentary structures in nearby molecular clouds have been found to exhibit a characteristic width of 0.1 pc, as observed in dust emission. Understanding the origin of this universal width has become a topic of central importance in the study of molecular cloud structure and the early stages of star formation. Aims. We investigate how the recovered widths of filaments depend on the distance from the observer by using previously published results from the Herschel Gould Belt Survey. Methods. We obtained updated estimates on the distances to nearby molecular clouds observed with Herschel by using recent results based on 3D dust extinction mapping and Gaia. We examined the widths of filaments from individual clouds separately, as opposed to treating them as a single population. We used these per-cloud filament widths to search for signs of variation amongst the clouds of the previously published study. Results. We find a significant dependence of the mean per-cloud filament width with distance. The distribution of mean filament widths for nearby clouds is incompatible with that of farther away clouds. The mean per-cloud widths scale with distance approximately as 4−5 times the beam size. We examine the effects of resolution by performing a convergence study of a filament profile in the Herschel image of the Taurus Molecular Cloud. We find that resolution can severely affect the shapes of radial profiles over the observed range of distances. Conclusions. We conclude that the data are inconsistent with 0.1 pc being the universal characteristic width of filaments.
dc.relation.ispartofAstronomy & Astrophysicsen
dc.subjectISM: cloudsen
dc.subjectISM: structureen
dc.subjectStars: formationen
dc.subjectLocal interstellar matteren
dc.subjectQB Astronomyen
dc.titleThe width of Herschel filaments varies with distanceen
dc.typeJournal itemen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.description.statusPeer revieweden

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