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Recently gathered observational data on a sample of Type Ia Supernovae (SNeIa) reveal a wide distribution of expansion velocities of the Fe cores,measured from the width of the nebular lines. Moreover, the velocity appears tocorrelate with the luminosity decline rate after maximum light, $\Deltam_{15}(B)$. Since it has been shown that for SNe Ia $\Delta m_{15}(B)$correlates with the absolute magnitude at maximum, this then implies a relationbetween the expansion velocity of the Fe nebula and the luminosity at maximum.Physically, the maximum luminosity is related to the mass of synthesized$^{56}$Ni, whereas the FWHM of the lines is related to the kinetic energy ofthe ejecta. Our finding constitutes observational proof of the theoreticalprediction that the two quantities have to be related.Comment: 10 pages, including 2 figures - accepted to ApJ Lette

Nebular Velocities in Type I[CLC]a[/CLC] Supernovae and Their Relationship to Light Curves