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dc.contributor.authorGallagher, Joseph S.
dc.contributor.authorGarnavich, Peter M.
dc.contributor.authorCaldwell, Nelson
dc.contributor.authorKirshner, Robert P.
dc.contributor.authorJha, Saurabh W.
dc.contributor.authorLi, Weidong
dc.contributor.authorGaneshalingam, Mohan
dc.contributor.authorFilippenko, Alexei V.
dc.date.accessioned2019-09-25T14:11:47Z
dc.date.issued2008
dc.identifier.citationGallagher, Joseph S., Peter M. Garnavich, Nelson Caldwell, Robert P. Kirshner, Saurabh W. Jha, Weidong Li, Mohan Ganeshalingam, and Alexei V. Filippenko. 2008. “Supernovae in Early‐Type Galaxies: Directly Connecting Age and Metallicity with Type Ia Luminosity.” The Astrophysical Journal 685 (2): 752–66. https://doi.org/10.1086/590659.
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41399732*
dc.description.abstractWe have obtained optical spectra of 29 early-type (E/S0) galaxies that hosted Type Ia supernovae (SNe Ia). We have measured absorption-line strengths and compared them to a grid of models to extract the relations between the supernova properties and the luminosity-weighted age/composition of the host galaxies. Such a direct measurement is a marked improvement over existing analyses that tend to rely on general correlations between the properties of stellar populations and morphology. We find a strong correlation suggesting that SNe Ia in galaxies whose populations have a characteristic age greater than 5 Gyr are similar to 1 mag fainter at V-max than those found in galaxies with younger populations. We find that SN Ia distance residuals in the Hubble diagram are correlated with host-galaxy metal abundance with higher iron abundance galaxies hosting less-luminous supernovae. We thus conclude that the time since progenitor formation primarily determines the radioactive Ni production while progenitor metal abundance has a weaker influence on peak luminosity, but one not fully corrected by light-curve shape and color fitters. This result, particularly the secondary dependence on metallicity, has significant implications for the determination of the equation-of-state parameter, w = P/(rho c(2)), and could impact planning for future dark-energy missions such as JDEM. Assuming no selection effects in discovering SNe Ia in local early-type galaxies, we find a higher specific SN Ia rate in E/S0 galaxies with ages below 3 Gyr than in older hosts. The higher rate and brighter luminosities seen in the youngest E/S0 hosts may be a result of recent star formation and represents a tail of the ''prompt'' SN Ia progenitors.
dc.language.isoen_US
dc.publisherAmerican Astronomical Society
dash.licenseLAA
dc.titleSupernovae in Early‐Type Galaxies: Directly Connecting Age and Metallicity with Type Ia Luminosity
dc.typeJournal Article
dc.description.versionVersion of Record
dc.relation.journalThe Astrophysical Journal
dash.depositing.authorKirshner, Robert P.::0f07c3b6230f5e5a42326bcba12a1795::600
dc.date.available2019-09-25T14:11:47Z
dash.workflow.comments1Science Serial ID 97919
dc.identifier.doi10.1086/590659
dash.source.volume685;2
dash.source.page752-766


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