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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 Ia) and its dispersion using high signal-to-noise Keck-I/LRIS-B spectroscopy for a sample of 36 events at intermediate redshift (z=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 the fi...

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Publication status:
Published

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Publisher copy:
10.1086/524981

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Institution:
University of Oxford
Division:
MPLS
Department:
Physics
Sub department:
Astrophysics
Role:
Author
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Journal:
Astrophys.J.
Volume:
674
Issue:
1
Pages:
51-69
Publication date:
2007-10-22
DOI:
EISSN:
1538-4357
ISSN:
0004-637X
Source identifiers:
6722
Keywords:
Pubs id:
pubs:6722
UUID:
uuid:e40b8646-b308-419b-98f3-feebd8ceff22
Local pid:
pubs:6722
Deposit date:
2012-12-19

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