Title:A rate study of Type Ia supernovae with Subaru/XMM-Newton Deep Survey

Author(s):Yutaka Ihara, Mamoru Doi, Tomoki Morokuma, Raynald Pain, 
Naohiro Takanashi, Tomonori Totani, Naoki Yasuda, Greg Aldering, Kyle Dawson, 
Gerson Goldhaber, Isobel Hook, Chris Lidman, Saul Perlmutter, 
Anthony Spadafora, Nao Suzuki, and Lifan Wang
(for the Supernova Cosmology Project Collaboration)

Abstract:
We present a measurement of the rate of high-z Type Ia supernovae (SNe Ia) 
using multi-epoch observations of Subaru/XMM-Newton Deep Field (SXDF) 
with Suprime-Cam (S-Cam) on the Subaru Telescope. The observations are 
the widest deep supernova survey ever made (FoV~1 deg^2, m_i<~25.5 mag). 
The SXDF had been repeatedly observed for 7 nights in the i'-band with S-Cam 
in 2002, and were additionally observed for 3 nights in 2003 and 2005 
for reference images. We obtained detailed light curves of the variable objects 
detected in SXDF, and 50 objects were classified as SNe Ia using the light 
curve fitting method at the redshift range of 0.2<z<1.4. In order to check 
the completeness and contamination, we performed Monte Carlo simulations and 
generated ~100,000 light curves of SNe Ia and II from templates. The control 
time and detection efficiency of the supernova survey were also calculated 
using the artificial light curves. We finally derived an increasing trend of 
SN Ia rates at around z~1.2. We compared our results to other SN Ia rate 
results from low-z to high-z. Our results are the first results of high-z SN Ia 
rates with large statistics using light curves obtained by ground based 
telescopes, and give us visions of the SN rate studies for the future.