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dc.contributor.authorCicone, Cen
dc.contributor.authorSevergnini, Pen
dc.contributor.authorPapadopoulos, PPen
dc.contributor.authorMaiolino, Robertoen
dc.contributor.authorFeruglio, Cen
dc.contributor.authorTreister, Een
dc.contributor.authorPrivon, GCen
dc.contributor.authorZhang, ZYen
dc.contributor.authorCeca, RDen
dc.contributor.authorFiore, Fen
dc.contributor.authorSchawinski, Ken
dc.contributor.authorWagg, Jen
dc.date.accessioned2018-10-03T04:44:02Z
dc.date.available2018-10-03T04:44:02Z
dc.date.issued2018-01-01en
dc.identifier.issn0004-637X
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/283044
dc.description.abstractWe present ALMA and ACA [CI]3P1−3P0 ([CI](1-0)) observations of NGC6240, which we combine with ALMA CO(2-1) and IRAM PdBI CO(1-0) data to study the physical properties of the massive molecular (H2) outflow. We discover that the receding and approaching sides of the H2 outflow, aligned east-west, exceed 10 kpc in their total extent. High resolution (0.24") [CI](1-0) line images surprisingly reveal that the outflow emission peaks between the two AGNs, rather than on either of the two, and that it dominates the velocity field in this nuclear region. We combine the [CI](1-0) and CO(1-0) data to constrain the CO-to-H2 conversion factor (αCO) in the outflow, which is on average 2.1±1.2 M⊙(K km s−1 pc2)−1. We estimate that 60±20 % of the total H2 gas reservoir of NGC6240 is entrained in the outflow, for a resulting mass-loss rate of M˙out=2500±1200 M⊙ yr−1 ≡50±30 SFR. This energetics rules out a solely star formation-driven wind, but the puzzling morphology challenges a classic radiative-mode AGN feedback scenario. For the quiescent gas we compute ⟨αCO⟩=3.2±1.8 M⊙(K km s−1 pc2)−1, which is at least twice the value commonly employed for (U)LIRGs. We observe a tentative trend of increasing r21≡L′CO(2−1)/L′CO(1−0) ratios with velocity dispersion and measure r21>1 in the outflow, whereas r21≃1 in the quiescent gas. We propose that molecular outflows are the location of the warmer, strongly unbound phase that partially reduces the opacity of the CO lines in (U)LIRGs, hence driving down their global αCO and increasing their r21 values.
dc.description.sponsorshipERC Advanced Grant 695671 "QUENCH" STFC ST/M001172/1
dc.publisherUniversity of Chicago Press
dc.titleALMA [C i]<sup>3</sup> P <inf>1</inf>-<sup>3</sup> P <inf>0</inf> Observations of NGC 6240: A Puzzling Molecular Outflow, and the Role of Outflows in the Global α <inf>CO</inf> Factor of (U)LIRGsen
dc.typeArticle
prism.endingPage18
prism.issueIdentifier2en
prism.publicationDate2018en
prism.publicationNameAstrophysical Journalen
prism.startingPage1
prism.volume863en
dc.identifier.doi10.17863/CAM.30407
dcterms.dateAccepted2018-07-16en
rioxxterms.versionofrecord10.3847/1538-4357/aad32aen
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2018-01-01en
dc.contributor.orcidCicone, C [0000-0003-0522-6941]
dc.contributor.orcidMaiolino, Roberto [0000-0002-4985-3819]
dc.contributor.orcidTreister, E [0000-0001-7568-6412]
dc.contributor.orcidPrivon, GC [0000-0003-3474-1125]
dc.contributor.orcidSchawinski, K [0000-0001-5464-0888]
dc.identifier.eissn1538-4357
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idSTFC (ST/M001172/1)
pubs.funder-project-idECH2020 EUROPEAN RESEARCH COUNCIL (ERC) (695671)
cam.orpheus.successThu Jan 30 10:54:37 GMT 2020 - The item has an open VoR version.*
rioxxterms.freetoread.startdate2100-01-01


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