A measurement of the rate of type Ia Supernovae at redshift z ≈ 0.1 from the first feason of the SDSS-II Supernova Survey

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Title: A measurement of the rate of type Ia Supernovae at redshift z ≈ 0.1 from the first feason of the SDSS-II Supernova Survey
Author: Dilday, Benjamin; Kessler, Richard; Frieman, Joshua; Holtzman, Jon; Marriner, John; Miknaitis, Gajus; Nichol, Robert; Romani, Roger; Sako, Masao; Bassett, Bruce; Becker, Andrew; Cinabro, David; DeJongh, Fritz; Depoy, Darren; Doi, Mamoru; Garnavich, Peter; Hogan, Craig; Jha, Saurabh; Konishi, Kohki; Lampeitl, Hubert; Marshall, Jennifer; McGinnis, David; Prieto, Jose Luis; Riess, Adam; Richmond, Michael; Schneider, Donald; Smith, Matthew; Takanashi, Naohiro; Tokita, Kouichi; van der Heyden, Kurt; Yasuda, Naoki; Zheng, Chen; Barentine, John; Brewington, Howard; Choi, Changsu; Crotts, Arlin; Dembicky, Jack; Harvanek, Michael; Im, Myunshin; Ketzback, William; Kleinman, Scott; Krzesinski, Jurek; Long, Daniel; Malanushenko, Elena; Malanushenko, Viktor; McMillan, Russet; Nitta, Atsuko; Pan, Kaike; Saurage, Gabrelle; Snedden, Stephanie; Watters, Shannon; Wheeller, Craig; York, Donald
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 m = 0.3 = 1 − , we find a volumetric SN Ia rate of [2.93+0.17 −0.04(systematic)+0.90 −0.71(statistical)]×10−5 SNe Mpc−3 h3 70 year−1, at a volumeweighted 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, rV ∝ (1 + z) , 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 ∼ 2.5σ level. Fitting the results to a model in which the volumetric SN rate, rV = 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 ⊙ year−1, B = (9.3+3.4 −3.1) × 10−4 SNe M−1 ⊙ .
Description: Also archived in: arXiv:0801.3297 v3 Jul 21 2008
Record URI: http://hdl.handle.net/1850/7521
Date: 2008-07-20

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