The green valley is a red herring: Galaxy Zoo reveals two evolutionary pathways towards quenching of star formation in early- and late-type galaxies star

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.contributor.otherSwiss Federal Institutes of Technology Domain
dc.contributor.otherETH Zurich
dc.contributor.otherYale University
dc.contributor.otherUniversity of Oxford
dc.contributor.otherUniversity of Minnesota System
dc.contributor.otherUniversity of Minnesota Twin Cities
dc.contributor.otherUniversity of Hertfordshire
dc.contributor.otherUniversity of Alabama Tuscaloosa
dc.contributor.otherUniversity of Portsmouth
dc.contributor.otherUniversity of California System
dc.contributor.otherUniversity of California San Diego
dc.contributor.otherUniversidad de Concepcion
dc.contributor.otherCommonwealth Scientific & Industrial Research Organisation (CSIRO)
dc.contributor.otherYonsei University
dc.date.accessioned2018-09-21T20:32:33Z
dc.date.available2018-09-21T20:32:33Z
dc.date.issued2014-03-15
dc.description.abstractWe use SDSS+GALEX+Galaxy Zoo data to study the quenching of star formation in low-redshift 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_US
dc.format.mimetypeapplication/pdf
dc.identifier.citationSchawinski, K. et al. (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, 440(1). DOI: https://doi.org/10.1093/mnras/stu327
dc.identifier.doi10.1093/mnras/stu327
dc.identifier.orcidhttps://orcid.org/0000-0001-5464-0888
dc.identifier.orcidhttps://orcid.org/0000-0003-0846-9578
dc.identifier.orcidhttps://orcid.org/0000-0003-4264-3509
dc.identifier.orcidhttps://orcid.org/0000-0002-0745-9792
dc.identifier.orcidhttps://orcid.org/0000-0003-2227-4902
dc.identifier.orcidhttps://orcid.org/0000-0002-1067-8558
dc.identifier.orcidhttps://orcid.org/0000-0002-5601-575X
dc.identifier.orcidhttps://orcid.org/0000-0001-7568-6412
dc.identifier.orcidhttps://orcid.org/0000-0001-5882-3323
dc.identifier.urihttp://ir.ua.edu/handle/123456789/3933
dc.languageEnglish
dc.language.isoen_US
dc.publisherOxford University Press
dc.rights.licenseAttribution 4.0 International (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectgalaxies: active
dc.subjectgalaxies: elliptical and lenticular
dc.subjectcD
dc.subjectgalaxies: evolution
dc.subjectgalaxies: spiral
dc.subjectACTIVE GALACTIC NUCLEI
dc.subjectDIGITAL-SKY-SURVEY
dc.subjectSIMILAR-TO 1
dc.subjectCOLOR-MAGNITUDE DIAGRAM
dc.subjectSUPERMASSIVE BLACK-HOLES
dc.subjectSURVEY IMAGING DATA
dc.subjectX-RAY BINARIES
dc.subjectFORMING GALAXIES
dc.subjectDISC GALAXIES
dc.subjectHOST GALAXIES
dc.subjectAstronomy & Astrophysics
dc.titleThe green valley is a red herring: Galaxy Zoo reveals two evolutionary pathways towards quenching of star formation in early- and late-type galaxies staren_US
dc.typetext
dc.typeArticle
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