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astro-ph.CO2010★ 31 cited
Evidence for a correlation between the Si II 4000 width and Type Ia supernova color
J. Nordin, L. Ostman, A. Goobar +8
We study the pseudo equivalent width of the Si II 4000 feature of Type Ia supernovae in the redshift range 0.0024 < z < 0.634. We find that this spectral indicator correlates with…
astro-ph.CO2010★ 47 cited
NTT and NOT spectroscopy of SDSS-II supernovae
L. Ostman, J. Nordin, A. Goobar +18
Context. The SDSS-II Supernova Survey, conducted between 2005 and 2007, was designed to detect a large number of Type Ia supernovae (SNe Ia) around z~0.2, the redshift "gap" betwee…