TY - JOUR
T1 - Subaru FOCAS spectroscopic observations of high-redshift supernovae
AU - Morokuma, Tomoki
AU - Tokita, Kouichi
AU - Lidman, Christopher
AU - Doi, Mamoru
AU - Yasuda, Naoki
AU - Aldering, Greg
AU - Amanullah, Rahman
AU - Barbary, Kyle
AU - Dawson, Kyle
AU - Fadeyev, Vitaliy
AU - Fakhouri, Hannah K.
AU - Goldhaber, Gerson
AU - Goobar, Ariel
AU - Hattori, Takashi
AU - Hayano, Junji
AU - Hook, Isobel M.
AU - Andrew Howell, D.
AU - Furusawa, Hisanori
AU - Ihara, Yutaka
AU - Kashikawa, Nobunari
AU - Knop, Rob A.
AU - Konishi, Kohki
AU - Meyers, Joshua
AU - Oda, Takeshi
AU - Pain, Reynald
AU - Perlmutter, Saul
AU - Rubin, David
AU - Spadafora, Anthony L.
AU - Suzuki, Nao
AU - Takanashi, Naohiro
AU - Totani, Tomonori
AU - Utsunomiya, Hiroyuki
AU - Wang, Lifan
PY - 2010
Y1 - 2010
N2 - We present spectra of high-redshift supernovae (SNe) that were taken with the Subaru low-resolution optical spectrograph, FOCAS. These SNe were found in SN surveys with Suprime-Cam on Subaru, the CFH 12k camera on the Canada-France-Hawaii Telescope, and the Advanced Camera for Surveys on the Hubble Space Telescope. These SN surveys specifically targeted z > 1 Type Ia supernovae (SNe Ia). From the spectra of 39 candidates, we obtained redshifts for 32 candidates and spectroscopically identified 7 active candidates as probable SNe Ia, including one at z = 1.35, which is the most distant SN Ia to be spectroscopically confirmed with a ground-based telescope. An additional 4 candidates were identified as likely SNe Ia from the spectrophotometric properties of their host galaxies. Seven candidates are not SNe Ia, either being SNe of another type or active galactic nuclei. When SNe Ia were observed within one week of the maximum light, we found that we could spectroscopically identify most of them up to z = 1.1. Beyond this redshift, very few candidates were spectroscopically identified as SNe Ia. The current generation of super red-sensitive, fringe-free CCDs will push this redshift limit higher.
AB - We present spectra of high-redshift supernovae (SNe) that were taken with the Subaru low-resolution optical spectrograph, FOCAS. These SNe were found in SN surveys with Suprime-Cam on Subaru, the CFH 12k camera on the Canada-France-Hawaii Telescope, and the Advanced Camera for Surveys on the Hubble Space Telescope. These SN surveys specifically targeted z > 1 Type Ia supernovae (SNe Ia). From the spectra of 39 candidates, we obtained redshifts for 32 candidates and spectroscopically identified 7 active candidates as probable SNe Ia, including one at z = 1.35, which is the most distant SN Ia to be spectroscopically confirmed with a ground-based telescope. An additional 4 candidates were identified as likely SNe Ia from the spectrophotometric properties of their host galaxies. Seven candidates are not SNe Ia, either being SNe of another type or active galactic nuclei. When SNe Ia were observed within one week of the maximum light, we found that we could spectroscopically identify most of them up to z = 1.1. Beyond this redshift, very few candidates were spectroscopically identified as SNe Ia. The current generation of super red-sensitive, fringe-free CCDs will push this redshift limit higher.
KW - Cosmology: observations
KW - Stars: Supernovae: General
KW - Surveys
UR - http://www.scopus.com/inward/record.url?scp=77950569296&partnerID=8YFLogxK
U2 - 10.1093/pasj/62.1.19
DO - 10.1093/pasj/62.1.19
M3 - Article
AN - SCOPUS:77950569296
SN - 0004-6264
VL - 62
SP - 19
EP - 37
JO - Publications of the Astronomical Society of Japan
JF - Publications of the Astronomical Society of Japan
IS - 1
ER -