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dc.contributor.authorForbrich, Jan
dc.contributor.authorLada, Charles J.
dc.contributor.authorViaene, Sébastien
dc.contributor.authorPetitpas, Glen
dc.date.accessioned2020-02-20T01:07:11Z
dc.date.available2020-02-20T01:07:11Z
dc.date.issued2020-02-11
dc.identifier.citationForbrich , J , Lada , C J , Viaene , S & Petitpas , G 2020 , ' First Resolved Dust Continuum Measurements of Individual Giant Molecular Clouds in the Andromeda Galaxy ' , The Astrophysical Journal , vol. 890 , no. 1 , 42 . https://doi.org/10.3847/1538-4357/ab68de
dc.identifier.issn0004-637X
dc.identifier.otherArXiv: http://arxiv.org/abs/2001.02914v1
dc.identifier.otherORCID: /0000-0001-8694-4966/work/69424473
dc.identifier.urihttp://hdl.handle.net/2299/22315
dc.description© 2020 The American Astronomical Society.
dc.description.abstractIn our local Galactic neighborhood, molecular clouds are best studied using a combination of dust measurements, to determine robust masses, sizes, and internal structures of the clouds, and molecular-line observations to determine cloud kinematics and chemistry. We present here the first results of a program designed to extend such studies to nearby galaxies beyond the Magellanic Clouds. Utilizing the wideband upgrade of the Submillimeter Array (SMA) at 230 GHz, we have obtained the first continuum detections of the thermal dust emission on sub-GMC scales (∼15 pc) within the Andromeda galaxy (M31). These include the first resolved continuum detections of dust emission from individual giant molecular clouds (GMCs) beyond the Magellanic Clouds. Utilizing a powerful capability of the SMA, we simultaneously recorded CO(2-1) emission with identical (u, v) coverage, astrometry, and calibration, enabling the first measurements of the CO conversion factor, α CO(2-1), toward individual GMCs across an external galaxy. Our direct measurement yields an average CO-to-dust mass conversion factor of α' CO-dust = 0.042 ± 0.018 M o (K km s -1 pc 2) -1 for the J = 2-1 transition. This value does not appear to vary with galactocentric radius. Assuming a constant gas-to-dust ratio of 136, the resulting α CO = 5.7 ± 2.4 M o (K km s -1 pc 2) -1 for the 2-1 transition is in excellent agreement with that of GMCs in the Milky Way, given the uncertainties. Finally, using the same analysis techniques, we compare our results with observations of the local Orion molecular clouds, placed at the distance of M31 and simulated to appear as they would if observed by the SMA.en
dc.format.extent9
dc.format.extent2077549
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.subjectAstronomy and Astrophysics
dc.subjectSpace and Planetary Science
dc.titleFirst Resolved Dust Continuum Measurements of Individual Giant Molecular Clouds in the Andromeda Galaxyen
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=85081647413&partnerID=8YFLogxK
rioxxterms.versionofrecord10.3847/1538-4357/ab68de
rioxxterms.typeJournal Article/Review


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