Quantitative comparison between Type Ia supernova spectra at low and high redshifts: A case study
We develop a method to measure the strength of the absorption features in type Ia supernova (SN Ia) spectra and use it to make a quantitative comparisons between the spectra of type Ia supernovae at low and high redshifts. In this case study, we apply the method to 12 high-redshift (0.212 = z = 0.912) SNe Ia observed by the Supernova Cosmology Project. Through measurements of the strengths of these features and of the blueshift of theabsorption minimum in Ca ii H&K, we show that the spectra of the high-redshift SNe Ia are quantitatively similar to spectra of nearby SNe Ia (z< 0.15). One supernova in our high redshift sample, SN 2002fd at z = 0.279, is found to have spectral characteristics that are associated with peculiar SN 1991T/SN 1999aa-like supernovae.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- Computational Research Division; Physics Division
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 934981
- Report Number(s):
- LBNL-632E; AAEJAF; TRN: US0804032
- Journal Information:
- Astronomy and Astrophysics, Vol. 470, Issue 2; Related Information: Journal Publication Date: August I 2007; ISSN 0004-6361
- Country of Publication:
- United States
- Language:
- English
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