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dc.contributor.authorHacar, A.
dc.contributor.authorTafalla, M.
dc.contributor.authorForbrich, J.
dc.contributor.authorAlves, J.
dc.contributor.authorMeingast, S.
dc.contributor.authorGrossschedl, J.
dc.contributor.authorTeixeira, P. S.
dc.date.accessioned2018-07-04T16:13:02Z
dc.date.available2018-07-04T16:13:02Z
dc.date.issued2018-03-07
dc.identifier.citationHacar , A , Tafalla , M , Forbrich , J , Alves , J , Meingast , S , Grossschedl , J & Teixeira , P S 2018 , ' An ALMA study of the Orion Integral Filament : I. Evidence for narrow fibers in a massive cloud ' , Astronomy & Astrophysics , vol. 610 , A77 . https://doi.org/10.1051/0004-6361/201731894
dc.identifier.issn0004-6361
dc.identifier.otherPURE: 13172399
dc.identifier.otherPURE UUID: aeecef8c-118b-4cc4-ac61-523414926088
dc.identifier.otherArXiv: http://arxiv.org/abs/1801.01500v1
dc.identifier.otherScopus: 85043521065
dc.identifier.otherORCID: /0000-0001-8694-4966/work/62751215
dc.identifier.urihttp://hdl.handle.net/2299/20259
dc.description© 2018 ESO. Reproduced with permission from Astronomy & Astrophysics. Content in the UH Research Archive is made available for personal research, educational, and non-commercial purposes only. Unless otherwise stated, all content is protected by copyright, and in the absence of an open license, permissions for further re-use should be sought from the publisher, the author, or other copyright holder.
dc.description.abstractAim. We have investigated the gas organization within the paradigmatic Integral Shape Filament (ISF) in Orion in order to decipher whether or not all filaments are bundles of fibers. Methods. We combined two new ALMA Cycle 3 mosaics with previous IRAM 30m observations to produce a high-dynamic range N 2H + (1-0) emission map of the ISF tracing its high-density material and velocity structure down to scales of 0.009 pc (or ~2000 AU). Results. From the analysis of the gas kinematics, we identify a total of 55 dense fibers in the central region of the ISF. Independently of their location in the cloud, these fibers are characterized by transonic internal motions, lengths of ~0.15 pc, and masses per unit length close to those expected in hydrostatic equilibrium. The ISF fibers are spatially organized forming a dense bundle with multiple hub-like associations likely shaped by the local gravitational potential. Within this complex network, the ISF fibers show a compact radial emission profile with a median FWHM of 0.035 pc systematically narrower than the previously proposed universal 0.1 pc filament width. Conclusions. Our ALMA observations reveal complex bundles of fibers in the ISF, suggesting strong similarities between the internal substructure of this massive filament and previously studied lower-mass objects. The fibers show identical dynamic properties in both low- and high-mass regions, and their widespread detection in nearby clouds suggests a preferred organizational mechanism of gas in which the physical fiber dimensions (width and length) are self-regulated depending on their intrinsic gas density. Combining these results with previous works in Musca, Taurus, and Perseus, we identify a systematic increase of the surface density of fibers as a function of the total mass per-unit-length in filamentary clouds. Based on this empirical correlation, we propose a unified star-formation scenario where the observed differences between low- and high-mass clouds, and the origin of clusters, emerge naturally from the initial concentration of fibers.en
dc.format.extent24
dc.language.isoeng
dc.relation.ispartofAstronomy & Astrophysics
dc.rightsOpen
dc.subjectISM: clouds
dc.subjectISM: kinematics and dynamics
dc.subjectISM: structure
dc.subjectStars: formation
dc.subjectSubmillimeter: ISM
dc.subjectAstronomy and Astrophysics
dc.subjectSpace and Planetary Science
dc.titleAn ALMA study of the Orion Integral Filament : I. Evidence for narrow fibers in a massive clouden
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85043521065&partnerID=8YFLogxK
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2018-03-07
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1051/0004-6361/201731894
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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