期刊
ASTRONOMICAL JOURNAL
卷 135, 期 1, 页码 338-347出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/135/1/338
关键词
supernovae : general; surveys
资金
- STFC [ST/F002963/1, PP/E001149/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F002963/1, PP/E001149/1] Funding Source: researchfish
The Sloan Digital Sky Survey-II (SDSS-II) has embarked on a multi-year project to identify and measure light curves for intermediate-redshift (0.05 < z < 0.35) Type la supernovae (SNe Ia) using repeated five-band (ugriz) imaging over an area of 300 sq. deg. The survey region is a stripe 2.5 degrees wide centered on the celestial equator in the Southern Galactic Cap that has been imaged numerous times in earlier years, enabling construction of a deep reference image for the discovery of new objects. Supernova imaging observations are being acquired between September I and November 30 of 2005-7. During the first two seasons, each region was imaged on average every five nights. Spectroscopic follow-up observations to determine supernova type and redshift are carried out on a large number of telescopes. In its first two three-month seasons, the survey has discovered and measured light curves for 327 spectroscopically confirmed SNe Ia, 30 probable SNe Ia, 14 confirmed SNe Ib/c, 32 confirmed SNe 11, plus a large number of photometrically identified SNe la, 94 of which have host-galaxy spectra taken so far. This paper provides an overview of the project and briefly describes the observations completed during the first two seasons of operation.
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