SN Ia host galaxy properties from Sloan Digital Sky Survey-II spectroscopy

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dc.contributor.authorJohansson, Jonas
dc.contributor.authorThomas, Daniel
dc.contributor.authorSmith, Mathew
dc.contributor.authorPforr, Janine
dc.contributor.authorMaraston, Claudia
dc.contributor.authorNichol, Robert C.
dc.contributor.authorLampeitl, Hubert
dc.contributor.authorBeifiori, Alessandra
dc.contributor.authorGupta, Ravi R.
dc.contributor.authorSchneider, Donald P.
dc.date.accessioned2017-07-25T09:59:09Z
dc.date.available2017-07-25T09:59:09Z
dc.date.issued2013
dc.description.abstractWe study the stellar populations of Type Ia supernova (SN Ia) host galaxies using Sloan Digital Sky Survey (SDSS)-II spectroscopy. The main focus is on the relationships of SN Ia properties with stellar velocity dispersion and the stellar population parameters age, metallicity and element abundance ratios. We concentrate on a sub-sample of 84 SNe Ia from the SDSS-II Supernova Survey and find that SALT2 stretch factor values show the strongest dependence on stellar population age. Hence, more luminous SNe Ia appear in younger stellar progenitor systems. No statistically significant trends in the Hubble residual with any of the stellar population parameters studied are found. Moreover, the method of photometric stellar mass derivation affects the Hubble residual–mass relationship. For an extended sample (247 objects), including SNe Ia with SDSS host galaxy photometry only, the Hubble residual–mass relationship behaves as a sloped step function. In the high-mass regime, probed by our host spectroscopy sample, this relationship is flat. Below a stellar mass of ∼2 × 1010M , i.e. close to the evolutionary transition mass of low-redshift galaxies, the trend changes dramatically such that lower mass galaxies possess lower luminosity SNe Ia after light-curve corrections. The sloped step function of the Hubble residual–mass relationship should be accounted for when using stellar mass as a further parameter for minimizing the Hubble residuals.en_US
dc.description.accreditationDepartment of HE and Training approved list
dc.identifier.citationJohansson, J. et al. (2103). SN Ia host galaxy properties from Sloan Digital Sky Survey-II spectroscopy. Monthly Notices of the Royal Astronomical Society, 435: 1680–1700en_US
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/10566/3106
dc.language.isoenen_US
dc.publisherOxford University Pressen_US
dc.rightsPublisher retains copyright. Authors may archive the published version in their institutional repository.
dc.source.urihttp://dx.doi.org/10.1093/mnras/stt1408
dc.subjectSupernovaeen_US
dc.subjectGeneral – galaxiesen_US
dc.subjectAbundancesen_US
dc.subjectCosmological parametersen_US
dc.subjectCosmologyen_US
dc.subjectObservationsen_US
dc.subjectDistance scaleen_US
dc.subjectLarge-scale structure of Universeen_US
dc.titleSN Ia host galaxy properties from Sloan Digital Sky Survey-II spectroscopyen_US
dc.typeArticleen_US

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