Elemental gas-phase abundances of intermediate redshift type Ia supernova star-forming host galaxies

M. E. Moreno-Raya, L. Galbany, Á. R López-Sánchez, M. Mollá, S. Gonźalez-Gaitán, J. M. Vílchez, A. Carnero

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Abstract

The maximum luminosity of type Ia supernovae (SNe Ia) depends on the oxygen abundance of the regions of the host galaxies, where they explode. This metallicity dependence reduces the dispersion in the Hubble diagram (HD) when included with the traditional two-parameter calibration of SN Ia light-curve parameters and absolute magnitude. In this work, we use empirical calibrations to carefully estimate the oxygen abundance of galaxies hosting SNe Ia from the SDSS-II/SN (Sloan Digital Sky Survey-II Supernova) survey at intermediate redshift by measuring their emission-line intensities. We also derive electronic temperature with the direct method for a small fraction of objects for consistency. We find a trend of decreasing oxygen abundance with increasing redshift for the most massive galaxies. Moreover, we study the dependence of the HD residuals (HR) with galaxy oxygen abundance obtaining a correlation in line with those found in other works. In particular, the HR versus oxygen abundance shows a slope of -0.186± 0.123 mag dex-1 (1.52σ) in good agreement with theoretical expectations. This implies smaller distance modulii after corrections for SNe Ia in metal-rich galaxies. Based on our previous results on local SNe Ia, we propose this dependence to be due to the lower luminosity of the SNe Ia produced in more metal-rich environments.

LanguageEnglish
Pages307-322
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume476
Issue number1
DOIs
Publication statusPublished - 1 May 2018

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supernovae
vapor phases
galaxies
stars
oxygen
Hubble diagram
gas
diagram
luminosity
calibration
metal
metals
light curve
metallicity
slopes
trends
estimates
electronics
temperature
parameter

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Moreno-Raya, M. E. ; Galbany, L. ; López-Sánchez, Á. R ; Mollá, M. ; Gonźalez-Gaitán, S. ; Vílchez, J. M. ; Carnero, A. / Elemental gas-phase abundances of intermediate redshift type Ia supernova star-forming host galaxies. In: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 476, No. 1. pp. 307-322.
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abstract = "The maximum luminosity of type Ia supernovae (SNe Ia) depends on the oxygen abundance of the regions of the host galaxies, where they explode. This metallicity dependence reduces the dispersion in the Hubble diagram (HD) when included with the traditional two-parameter calibration of SN Ia light-curve parameters and absolute magnitude. In this work, we use empirical calibrations to carefully estimate the oxygen abundance of galaxies hosting SNe Ia from the SDSS-II/SN (Sloan Digital Sky Survey-II Supernova) survey at intermediate redshift by measuring their emission-line intensities. We also derive electronic temperature with the direct method for a small fraction of objects for consistency. We find a trend of decreasing oxygen abundance with increasing redshift for the most massive galaxies. Moreover, we study the dependence of the HD residuals (HR) with galaxy oxygen abundance obtaining a correlation in line with those found in other works. In particular, the HR versus oxygen abundance shows a slope of -0.186± 0.123 mag dex-1 (1.52σ) in good agreement with theoretical expectations. This implies smaller distance modulii after corrections for SNe Ia in metal-rich galaxies. Based on our previous results on local SNe Ia, we propose this dependence to be due to the lower luminosity of the SNe Ia produced in more metal-rich environments.",
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Elemental gas-phase abundances of intermediate redshift type Ia supernova star-forming host galaxies. / Moreno-Raya, M. E.; Galbany, L.; López-Sánchez, Á. R; Mollá, M.; Gonźalez-Gaitán, S.; Vílchez, J. M.; Carnero, A.

In: Monthly Notices of the Royal Astronomical Society, Vol. 476, No. 1, 01.05.2018, p. 307-322.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Moreno-Raya,M. E.

AU - Galbany,L.

AU - López-Sánchez,Á. R

AU - Mollá,M.

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KW - HII regions

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KW - Methods: data analysis

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KW - Techniques: spectroscopic

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