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Verifying the cosmological utility of type Ia supernovae: Implications of a dispersion in the ultraviolet spectra

Abstract:

We analyze the mean rest-frame ultraviolet (UV) spectrum of Type Ia Supernovae (SNe) and its dispersion using high signal-to-noise ratio Keck-I/LRIS-B spectroscopy for a sample of 36 events at intermediate redshift (z̄ = 0.5) discovered by the Canada-France-Hawaii Telescope Supernova Legacy Survey (SNLS). We introduce a new method for removing host galaxy contamination in our spectra, exploiting the comprehensive photometric coverage of the SNLS SNe and their host galaxies, thereby providing ...

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Publisher copy:
10.1086/524981

Authors


Sullivan, M More by this author
Nugent, PE More by this author
Howell, DA More by this author
Gal-Yam, A More by this author
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Publisher:
Institute of Physics Publishing
Journal:
Astrophysical Journal
Volume:
674
Issue:
1
Pages:
51-69
Publication date:
2008-02-10
DOI:
EISSN:
1538-4357
ISSN:
0004-637X
URN:
uuid:68b23c2c-b9fe-438e-ae4e-f64a4eea1170
Source identifiers:
160722
Local pid:
pubs:160722

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