Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21343818w&link_type=abstract
American Astronomical Society, AAS Meeting #213, #470.08; Bulletin of the American Astronomical Society, Vol. 41, p.313
Astronomy and Astrophysics
Astronomy
Scientific paper
The Supernova Legacy Survey (SNLS) is an ambitious survey project to measure the redshifts and spectra of 450 Type Ia supernovae (SNe Ia) in order to measure the dark energy equation of state parameter w. This work is an evolutionary study looking at the differences between the high-z spectra measured as part of the SNLS and low-z objects from the literature with a long-term goal of measuring and calibrating out any differences between the two populations. This would be done in combination with light curve information (stretch), host galaxy type and SN Ia rates.
This study draws on techniques developed in two previous SNLS papers (Bronder et al. 2008 and Ellis et al. 2008) to measure the pseudo-equivalent widths (EW) of 3 spectral features - CaII H&K, SiII and MgII - in recent Gemini SNe Ia spectra. The spectra are a combination of both SN and host light so we use a sophisticated multi-band method to subtract the host galaxy light from the spectra to leave only SN light. A low-redshift sample for comparison is drawn from the literature and using a rolling mean to create a trend in EW with rest-frame phase.
The first results from this study show tantalising evidence for possible differences between the high-z and low-z populations, but the low-z trends are highly sensitive to the chosen sample and the methods used to generate them.
SNLS Collaboration
Walker Emma
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