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dc.contributor.authorDong, Chenxing
dc.contributor.authorSpilker, Justin S.
dc.contributor.authorGonzalez, Anthony H.
dc.contributor.authorApostolovski, Yordanka
dc.contributor.authorAravena, Manuel
dc.contributor.authorBéthermin, Matthieu
dc.contributor.authorChapman, Scott C.
dc.contributor.authorChen, Chian-Chou
dc.contributor.authorHayward, Christopher C.
dc.contributor.authorHezaveh, Yashar D.
dc.contributor.authorLitke, Katrina C.
dc.contributor.authorMa, Jingzhe
dc.contributor.authorMarrone, Daniel P.
dc.contributor.authorMorningstar, Warren R.
dc.contributor.authorPhadke, Kedar A.
dc.contributor.authorReuter, Cassie A.
dc.contributor.authorSreevani, Jarugula
dc.contributor.authorStark, Antony A.
dc.contributor.authorVieira, Joaquin D.
dc.contributor.authorWeiß, Axel
dc.date.accessioned2019-06-19T22:48:54Z
dc.date.available2019-06-19T22:48:54Z
dc.date.issued2019-03-01
dc.identifier.citationChenxing Dong et al 2019 ApJ 873 50en_US
dc.identifier.issn1538-4357
dc.identifier.doi10.3847/1538-4357/ab02fe
dc.identifier.urihttp://hdl.handle.net/10150/632954
dc.description.abstractWe present Atacama Large Millimeter/submillimeter Array (ALMA) observations of high-J CO lines (J(up) = 6, 7, 8) and associated dust continuum toward five strongly lensed, dusty, star-forming galaxies at redshift z = 2.7-5.7. These galaxies, discovered in the South Pole Telescope survey, are observed at 0.'' 2-0.'' 4 resolution with ALMA. Our high-resolution imaging coupled with the lensing magnification provides a measurement of the structure and kinematics of molecular gas in the background galaxies with spatial resolutions down to kiloparsec scales. We derive visibility-based lens models for each galaxy, accurately reproducing observations of four of the galaxies. Of these four targets, three show clear velocity gradients, of which two are likely rotating disks. We find that the reconstructed region of CO emission is less concentrated than the region emitting dust continuum even for the moderate-excitation CO lines, similar to what has been seen in the literature for lower-excitation transitions. We find that the lensing magnification of a given source can vary by 20%-50% across the line profile, between the continuum and line, and between different CO transitions. We apply Large Velocity Gradient modeling using apparent and intrinsic line ratios between lower-J and high-J CO lines. Ignoring these magnification variations can bias the estimate of physical properties of interstellar medium of the galaxies. The magnitude of the bias varies from galaxy to galaxy and is not necessarily predictable without high-resolution observations.en_US
dc.description.sponsorshipUniversity of Florida; McDonald Observatory at the University of Texas at Austin; Australian Government; Simons Foundationen_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.relation.urlhttp://stacks.iop.org/0004-637X/873/i=1/a=50?key=crossref.c0a55d4af888b6c0daa527f6db7f5014en_US
dc.rights© 2019. The American Astronomical Society. All rights reserved.en_US
dc.subjectgalaxies: high-redshiften_US
dc.subjectgalaxies: ISMen_US
dc.subjectgravitational lensing: strongen_US
dc.subjectISM: moleculesen_US
dc.titleSource Structure and Molecular Gas Properties from High-resolution CO Imaging of SPT-selected Dusty Star-forming Galaxiesen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Steward Observen_US
dc.identifier.journalASTROPHYSICAL JOURNALen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleThe Astrophysical Journal
dc.source.volume873
dc.source.issue1
dc.source.beginpage50
refterms.dateFOA2019-06-19T22:48:55Z


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