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Connecting young star clusters to CO molecular gas in NGC 7793 with ALMA-LEGUS

Grasha, Kathryn; Calzetti, Daniela; Bittle, L; Johnson, K E; Donovan Meyer, J; Kennicutt, Robert C; Elmegreen, B. G.; Adamo, Angela; Krumholz, Mark; Fumagalli, Michele; Grebel, E.; Gouliermis, Dimitrios A

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We present an investigation of the relationship between giant molecular cloud (GMC) properties and the associated stellar clusters in the nearby flocculent galaxy NGC 7793. We combine the star cluster catalogue from the HST LEGUS (Legacy ExtraGalactic UV Survey) programme with the 15 pc resolution ALMA CO(2–1) observations. We find a strong spatial correlation between young star clusters and GMCs such that all clusters still associated with a GMC are younger than 11 Myr and display a median age...[Show more]

dc.contributor.authorGrasha, Kathryn
dc.contributor.authorCalzetti, Daniela
dc.contributor.authorBittle, L
dc.contributor.authorJohnson, K E
dc.contributor.authorDonovan Meyer, J
dc.contributor.authorKennicutt, Robert C
dc.contributor.authorElmegreen, B. G.
dc.contributor.authorAdamo, Angela
dc.contributor.authorKrumholz, Mark
dc.contributor.authorFumagalli, Michele
dc.contributor.authorGrebel, E.
dc.contributor.authorGouliermis, Dimitrios A
dc.date.accessioned2019-07-30T01:30:58Z
dc.date.available2019-07-30T01:30:58Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/164801
dc.description.abstractWe present an investigation of the relationship between giant molecular cloud (GMC) properties and the associated stellar clusters in the nearby flocculent galaxy NGC 7793. We combine the star cluster catalogue from the HST LEGUS (Legacy ExtraGalactic UV Survey) programme with the 15 pc resolution ALMA CO(2–1) observations. We find a strong spatial correlation between young star clusters and GMCs such that all clusters still associated with a GMC are younger than 11 Myr and display a median age of 2 Myr. The age distribution increases gradually as the cluster–GMC distance increases, with star clusters that are spatially unassociated with molecular gas exhibiting a median age of 7 Myr. Thus, star clusters are able to emerge from their natal clouds long before the time-scale required for clouds to disperse. To investigate if the hierarchy observed in the stellar components is inherited from the GMCs, we quantify the amount of clustering in the spatial distributions of the components and find that the star clusters have a fractal dimension slope of −0.35 ± 0.03, significantly more clustered than the molecular cloud hierarchy with slope of −0.18 ± 0.04 over the range 40–800 pc. We find, however, that the spatial clustering becomes comparable in strength for GMCs and star clusters with slopes of −0.44 ± 0.03 and −0.45 ± 0.06, respectively, when we compare massive (>105 M⊙) GMCs to massive and young star clusters. This shows that massive star clusters trace the same hierarchy as their parent GMCs, under the assumption that the star formation efficiency is a few per cent.
dc.description.sponsorshipSupport for Program 13364 was provided by NASA through a grant from the Space Telescope Science Institute. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. This paper makes use of the following ALMA data: ADS/JAO.ALMA #2015.1.00782.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada) and NSC and ASIAA (Taiwan) and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Parts of this research were supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in three Dimensions (ASTRO 3D), through project number CE170100013. AA acknowledges the support of the Swedish Research Council (Vetenskapsradet) and the Swedish National Space Board (SNSB). ˚ MF acknowledges support by the Science and Technology Facilities Council [grant number ST/P000541/1]. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement number 757535)
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherOxford University Press
dc.rights© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.titleConnecting young star clusters to CO molecular gas in NGC 7793 with ALMA-LEGUS
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume481
dc.date.issued2018
local.identifier.absfor020103 - Cosmology and Extragalactic Astronomy
local.identifier.ariespublicationu4485658xPUB2606
local.publisher.urlhttp://www.oxfordjournals.org/
local.type.statusPublished Version
local.contributor.affiliationGrasha, Kathryn, College of Science, ANU
local.contributor.affiliationCalzetti, Daniela, University of Massachusetts
local.contributor.affiliationBittle, L, University of Virginia
local.contributor.affiliationJohnson, K E, University of Virginia
local.contributor.affiliationDonovan Meyer, J, National Radio Astronomy Observatory
local.contributor.affiliationKennicutt, Robert C , University of Cambridge
local.contributor.affiliationElmegreen, B. G., IBM
local.contributor.affiliationAdamo, Angela, Stockholm University
local.contributor.affiliationKrumholz, Mark, College of Science, ANU
local.contributor.affiliationFumagalli, Michele, Durham University
local.contributor.affiliationGrebel, E., Universitat Heidelberg
local.contributor.affiliationGouliermis, Dimitrios A, Max-Planck-Institute fur Astronomie
dc.relationhttp://purl.org/au-research/grants/arc/CE170100013
local.bibliographicCitation.issue1
local.bibliographicCitation.startpage1016
local.bibliographicCitation.lastpage1027
local.identifier.doi10.1093/MNRAS/STY2154
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2019-03-31T07:23:26Z
local.identifier.scopusID2-s2.0-85055316701
dcterms.accessRightsOpen Access
dc.provenancehttp://sherpa.ac.uk/romeo/issn/0035-8711/..."Publisher's version/PDF on Institutional repositories or Central repositories, with all rights reserved " from SHERPA/RoMEO site (as at 30/07/19).
CollectionsANU Research Publications

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