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dc.contributor.authorSchawinski, Kevin
dc.contributor.authorUrry, C. Megan
dc.contributor.authorSimmons, Brooke D.
dc.contributor.authorFortson, Lucy
dc.contributor.authorKaviraj, Sugata
dc.contributor.authorKeel, William C.
dc.contributor.authorLintott, Chris J.
dc.contributor.authorMasters, Karen L.
dc.contributor.authorNichol, Robert C.
dc.contributor.authorSarzi, Marc
dc.contributor.authorSkibba, Ramin
dc.contributor.authorTreister, Ezequiel
dc.contributor.authorWillett, Kyle W.
dc.contributor.authorWong, O. Ivy
dc.contributor.authorYi, Sukyoung K.
dc.date.accessioned2015-08-25T11:43:38Z
dc.date.available2015-08-25T11:43:38Z
dc.date.issued2014-05-01
dc.identifier.citationSchawinski , K , Urry , C M , Simmons , B D , Fortson , L , Kaviraj , S , Keel , W C , Lintott , C J , Masters , K L , Nichol , R C , Sarzi , M , Skibba , R , Treister , E , Willett , K W , Wong , O I & Yi , S K 2014 , ' The green valley is a red herring : Galaxy Zoo reveals two evolutionary pathways towards quenching of star formation in early-and late-type galaxies ' , Monthly Notices of the Royal Astronomical Society , vol. 440 , no. 1 , pp. 889-907 . https://doi.org/10.1093/mnras/stu327
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 9164285
dc.identifier.otherPURE UUID: 6a2a9962-b8ca-4601-8571-8c99f58843b2
dc.identifier.otherScopus: 84897479792
dc.identifier.urihttp://hdl.handle.net/2299/16358
dc.descriptionThis is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record [Kevin Schawinski, et al, 'The green valley is a red herring: Galaxy Zoo reveals two evolutionary pathways towards quenching of star formation in early- and late-type galaxies' MNRAS, Vol. 440(1): 889-907, May 2014] is available online at: https://doi.org/10.1093/mnras/stu327.
dc.description.abstractWe use SDSS+GALEX+Galaxy Zoo data to study the quenching of star formation in lowredshift galaxies. We show that the green valley between the blue cloud of star-forming galaxies and the red sequence of quiescent galaxies in the colour-mass diagram is not a single transitional state through which most blue galaxies evolve into red galaxies. Rather, an analysis that takes morphology into account makes clear that only a small population of blue early-type galaxies move rapidly across the green valley after the morphologies are transformed from disc to spheroid and star formation is quenched rapidly. In contrast, the majority of blue star-forming galaxies have significant discs, and they retain their late-type morphologies as their star formation rates decline very slowly. We summarize a range of observations that lead to these conclusions, including UV-optical colours and halo masses, which both show a striking dependence on morphological type. We interpret these results in terms of the evolution of cosmic gas supply and gas reservoirs. We conclude that late-type galaxies are consistent with a scenario where the cosmic supply of gas is shut off, perhaps at a critical halo mass, followed by a slow exhaustion of the remaining gas over several Gyr, driven by secular and/or environmental processes. In contrast, early-type galaxies require a scenario where the gas supply and gas reservoir are destroyed virtually instantaneously, with rapid quenching accompanied by a morphological transformation from disc to spheroid. This gas reservoir destruction could be the consequence of a major merger, which in most cases transforms galaxies from disc to elliptical morphology, and mergers could play a role in inducing black hole accretion and possibly active galactic nuclei feedback.en
dc.format.extent19
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.subjectGalaxies: Active
dc.subjectGalaxies: Elliptical and lenticular, cD
dc.subjectGalaxies: Evolution
dc.subjectGalaxies: Spiral
dc.titleThe green valley is a red herring : Galaxy Zoo reveals two evolutionary pathways towards quenching of star formation in early-and late-type galaxiesen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.1093/mnras/stu327
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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