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A Measurement of the Rate of Type Ia Supernovae at Redshift<i>z</i>≈ 0.1 from the First Season of the SDSS‐II Supernova Survey
We present a measurement of the rate of type Ia supernovae (SNe Ia) from the first of three seasons of data from the SDSS-II Supernova Survey. For this measurement, we include 17 SNe Ia at redshift $z\le0.12$. Assuming a flat cosmology with $\Omega_m = 0.3=1-\Omega_\Lambda$, we find a volumetric SN …