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Date and Time of the Query: 2019-06-26 T05:02:11 PDT
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For refcode 2011ApJ...734...42N:
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2011ApJ...734...42N Evidence for a Correlation Between the Si II {lambda}4000 Width and Type Ia Supernova Color Nordin, J.; Ostman, L.; Goobar, A.; Balland, C.; Lampeitl, H.; Nichol, R. C.; Sako, M.; Schneider, D. P.; Smith, M.; Sollerman, J.; Wheeler, J. C. Abstract. We study the pseudo-equivalent width of the Si II {lambda}4000 feature of Type Ia supernovae (SNe Ia) in the redshift range 0.0024 <= z <= 0.634. We find that this spectral indicator correlates with the light curve color excess (SALT2c) as well as previously defined spectroscopic subclasses (Branch types) and the evolution of the Si II {lambda}6150 velocity, i.e., the so-called velocity gradient. Based on our study of 55 objects from different surveys, we find indications that the Si II {lambda}4000 spectral indicator could provide important information to improve cosmological distance measurements with SNe Ia. Key words: cosmology: observations, distance scale, dust, extinction, supernovae: general
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