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dc.contributor.authorIrwin, J.
dc.contributor.authorWilson, C. D.
dc.contributor.authorWiegert, T.
dc.contributor.authorBendo, G.
dc.contributor.authorWarren, B.E.
dc.contributor.authorWang, Q.D.
dc.contributor.authorIsrael, F.P.
dc.contributor.authorSergeant, S.
dc.contributor.authorKnapen, Johan
dc.contributor.authorBrinks, E.
dc.contributor.authorTilanus, R.P.J.
dc.contributor.authorvan der Werf, P.
dc.contributor.authorMuhle, S.
dc.date.accessioned2011-08-15T11:01:35Z
dc.date.available2011-08-15T11:01:35Z
dc.date.issued2011
dc.identifier.citationIrwin , J , Wilson , C D , Wiegert , T , Bendo , G , Warren , B E , Wang , Q D , Israel , F P , Sergeant , S , Knapen , J , Brinks , E , Tilanus , R P J , van der Werf , P & Muhle , S 2011 , ' The JCMT nearby galaxies legacy survey - V. The CO(J=3-2) distribution and molecular outflow in NGC 4631 ' , Monthly Notices of the Royal Astronomical Society , vol. 410 , no. 3 , pp. 1423-1440 . https://doi.org/10.1111/j.1365-2966.2010.17510.x
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 305974
dc.identifier.otherPURE UUID: 01d7b313-7e04-4332-8e76-4dc408addb2a
dc.identifier.otherScopus: 79951689515
dc.identifier.otherORCID: /0000-0002-7758-9699/work/30407820
dc.identifier.urihttp://hdl.handle.net/2299/6198
dc.descriptionThe definitive version can be found at: http://onlinelibrary.wiley.com/ Copyright Wiley-Blackwell and Royal Astronomical Society
dc.description.abstractWe have made the first map of CO(J = 3-2) emission covering the disc of the edge-on galaxy, NGC 4631, which is known for its spectacular gaseous halo. The strongest emission, which we model with a Gaussian ring, occurs within a radius of 5 kpc. Weaker disc emission is detected out to radii of 12 kpc, the most extensive molecular component yet seen in this galaxy. From comparisons with infrared data, we find that CO(J = 3-2) emission more closely follows the hot dust component, rather than the cold dust, consistent with it being a good tracer of star formation. The first maps of R3-2/1-0, H-2 mass surface density and star formation efficiency (SFE) have been made for the inner 2.4 kpc radius region. Only 20 per cent of the star formation occurs in this region and excitation conditions are typical of galaxy discs, rather than of central starbursts. The SFE suggests long gas consumption time-scales (> 109 yr). The velocity field is dominated by a steeply rising rotation curve in the region of the central molecular ring followed by a flatter curve in the disc. A very steep gradient in the rotation curve is observed at the nucleus, providing the first evidence for a central concentration of mass: M-dyn = 5 x 107 M-circle dot within a radius of 282 pc. The velocity field shows anomalous features indicating the presence of molecular outflows; one of them is associated with a previously observed CO(J = 1-0) expanding shell. Consistent with these outflows is the presence of a thick (z up to 1.4 kpc) CO(J = 3-2) disc. We suggest that the interaction between NGC 4631 and its companion(s) has agitated the disc and also initiated star formation which was likely higher in the past than it is now. These may be necessary conditions for seeing prominent haloes.en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.subjectISM : bubbles
dc.subjectISM : molecules
dc.subjectISM : structure
dc.subjectgalaxies : halos
dc.subjectgalaxies : indivdual : NGC 4631
dc.subjectgalaxies : ISM
dc.titleThe JCMT nearby galaxies legacy survey - V. The CO(J=3-2) distribution and molecular outflow in NGC 4631en
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dc.description.versiontypeFinal Accepted Version
dcterms.dateAccepted2011
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1111/j.1365-2966.2010.17510.x
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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