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Authordc.contributor.authorYu, Lu 
Authordc.contributor.authorBlanc Mendiberri, Guillermo 
Authordc.contributor.authorBenson, Andrew 
Admission datedc.date.accessioned2016-05-10T13:27:52Z
Available datedc.date.available2016-05-10T13:27:52Z
Publication datedc.date.issued2015
Cita de ítemdc.identifier.citationThe Astrophysical Journal, 808:129 (9pp), 2015 August 1en_US
Identifierdc.identifier.otherDOI: 10.1088/0004-637X/808/2/129
Identifierdc.identifier.urihttps://repositorio.uchile.cl/handle/2250/138235
General notedc.descriptionArtículo de publicación ISIen_US
Abstractdc.description.abstractWe develop a simple analytical model that tracks galactic metallicities governed by star formation and feedback to gain insight from the observed galaxy stellar mass-metallicity relations over a large range of stellar masses and redshifts. The model reveals the following implications of star formation and feedback processes in galaxy formation. First, the observed metallicity relations provide a stringent upper limit for the averaged outflow mass-loading factors of local galaxies, which are similar to 20 for M-* similar to 10(9)M(circle dot) galaxies and monotonically decrease to similar to 1 for M-* similar to 10(11)M. galaxies. Second, the inferred upper limit for the outflow mass-loading factor sensitively depends on whether the outflow is metal-enriched with respect to the interstellar medium metallicity. If half of the metals ejected from supernovae leave the galaxy in metal-enriched winds, the outflow mass-loading factor for galaxies at any mass can barely be higher than similar to 10, which puts strong constraints on galaxy formation models. Third, the relatively lower stellar-phase to gas-phase metallicity ratio for lower-mass galaxies indicates that low-mass galaxies are still rapidly enriching their metallicities in recent times, while high-mass galaxies are more settled, which seems to show a downsizing effect in the metallicity evolution of galaxies. The analysis presented in the paper demonstrates the importance of accurate measurements of galaxy metallicities and the cold gas fraction of galaxies at different redshifts for constraining star formation and feedback processes, and demonstrates the power of these relations for constraining the physics of galaxy formation.en_US
Lenguagedc.language.isoenen_US
Publisherdc.publisherIOP Publishingen_US
Type of licensedc.rightsAtribución-NoComercial-SinDerivadas 3.0 Chile*
Link to Licensedc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/*
Keywordsdc.subjectGalaxies: evolutionen_US
Keywordsdc.subjectGalaxies: formationen_US
Títulodc.titleAn analytical model for galaxy metallicity: what do metallicity relations tell us about star formation and outflow?en_US
Document typedc.typeArtículo de revista


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Atribución-NoComercial-SinDerivadas 3.0 Chile
Except where otherwise noted, this item's license is described as Atribución-NoComercial-SinDerivadas 3.0 Chile