# Predicted and Observed Evolution in the Mean Properties of Type Ia Supernovae with Redshift

@article{Howell2007PredictedAO,
title={Predicted and Observed Evolution in the Mean Properties of Type Ia Supernovae with Redshift},
author={D. Andrew Howell and Mark Sullivan and Alex Conley and Raymond G. Carlberg},
journal={The Astrophysical Journal Letters},
year={2007},
volume={667},
pages={L37 - L40}
}
• Published 31 January 2007
• Physics
• The Astrophysical Journal Letters
Recent studies indicate that Type Ia supernovae (SNe Ia) consist of two groups—a "prompt" component whose rates are proportional to the host galaxy star formation rate, whose members have broader light curves and are intrinsically more luminous, and a "delayed" component whose members take several Gyr to explode, have narrower light curves, and are intrinsically fainter. As cosmic star formation density increases with redshift, the prompt component should begin to dominate. We use a two…

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