### Abstract

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 ≤ 0.12. Assuming a flat cosmology with Ω_{m} = 0.3 = 1 - Ω_{Λ}, we find a volumetric SN Ia rate of [2:93_{-0.040} ^{+0.17}(systematic)_{-0.71}^{+0.90}(statistical) × 10^{-5} SNe Mpc^{-3} h_{70}^{3} yr ^{-1}, at a volume-weighted mean redshift of 0.09. This result is consistent with previous measurements of the SN Ia rate in a similar redshift range. The systematic errors are well controlled, resulting in the most precise measurement of the SN Ia rate in this redshift range. We use a maximum likelihood method to fit SN rate models to the SDSS-II Supernova Survey data in combination with other rate measurements, thereby constraining models for the redshift evolution of the SN Ia rate. Fitting the combined data to a simple power-law evolution of the volumetric SN Ia rate, r_{V} ∝ (1 + z)^{β}, we obtain a value of β = 1.5 ± 0.6, i.e., the SN Ia rate is determined to be an increasing function of redshift at the ∼-2.5 σ level. Fitting the results to a model in which the volumetric SN rate is r_{V} = Aρ(t) + Bρ(t), where ρ(t) is the stellar mass density and ρ(t) is the star formation rate, we find A = (2.8 ± 1.2) × 10^{-14} SNe M_{⊙}^{-1} yr ^{-1}, B = (9.3-_{3.1}^{+3.4} × 10^{-4} SNe M_{ȯ}^{-1}.

Original language | English (US) |
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Pages (from-to) | 262-282 |

Number of pages | 21 |

Journal | Astrophysical Journal |

Volume | 682 |

Issue number | 1 |

DOIs | |

State | Published - Jul 20 2008 |

### All Science Journal Classification (ASJC) codes

- Astronomy and Astrophysics
- Space and Planetary Science

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## Cite this

*Astrophysical Journal*,

*682*(1), 262-282. https://doi.org/10.1086/587733