The type Ia supernovae rate with Subaru/XMM-Newton deep survey

Jun E. Okumura*, Yutaka Ihara, Mamoru Doi, Tomoki Morokuma, Reynald Pain, Tomonori Totani, Kyle Barbary, Naohiro Takanashi, Naoki Yasuda, Greg Aldering, Kyle Dawson, Gerson Goldhaber, Isobel Hook, Chris Lidman, Saul Perlmutter, Anthony Spadafora, Nao Suzuki, Lifan Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


We present measurements of the rates of high-redshift Type Ia supernovae derived from the Subaru/XMM-Newton Deep Survey (SXDS). We carried out repeated deep imaging observations with Suprime-Cam on the Subaru Telescope, and detected 1040 variable objects over 0.918deg2 in the Subaru/XMM-Newton Deep Field. From the imaging observations, light curves in the observed i band are constructed for all objects, and we fit the observed light curves with template light curves. Out of the 1040 variable objects detected by the SXDS, 39 objects over the redshift range 0.2 < z < 1.4 are classified as Type Ia supernovae using the light curves. These are among the most distant SN Ia rate measurements to date. We find that the Type Ia supernova rates increase up to z ∼ 0.8 and may then flatten at higher redshift. The rates can be fitted by a simple power law, rV(z) = r0(1 + z)α with r0=0.20+0.52 -0.16(stat.)+0.26 -0.07(syst.) × 10 -4yr-1Mpc-3, and α =2.04 +1.84 -1.96(stat.)+2.11 -0.86(syst.).

Original languageEnglish
Article number49
JournalPublications of the Astronomical Society of Japan
Issue number2
Publication statusPublished - 1 Apr 2014
Externally publishedYes


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