A Type II Supernova Hubble Diagram from the CSP-I, SDSS-II, and SNLS Surveys

作者：de Jaeger T; Gonzalez Gaitan S; Hamuy M; Galbany L; Anderson J P; Phillips M M; Stritzinger M D; Carlberg R G; Sullivan M; Gutierrez C P; Hook I M; Howell D Andrew; Hsiao E Y; Kuncarayakti H; Ruhlmann Kleider V; Folatelli G; Pritchet C; Basa S

来源：Astrophysical Journal, 2017, 835(2): 166.

DOI：10.3847/1538-4357/835/2/166

• distance scale
• galaxies: distances and redshifts
• supernovae: general

The coming era of large photometric wide-field surveys will increase the detection rate of supernovae by orders of magnitude. Such numbers will restrict spectroscopic follow-up in the vast majority of cases, and hence new methods based solely on photometric data must be developed. Here, we construct a complete Hubble diagram of Type II supernovae (SNe II) combining data from three different samples: the Carnegie Supernova Project-I, the Sloan Digital Sky Survey II SN, and the Supernova Legacy Survey. Applying the Photometric Color Method (PCM) to 73 SNe II with a redshift range of 0.01-0.5 and with no spectral information, we derive an intrinsic dispersion of 0.35 mag. A comparison with the Standard Candle Method (SCM) using 61 SNe. II is also performed and an intrinsic dispersion in the Hubble diagram of 0.27 mag, i. e., 13% in distance uncertainties, is derived. Due to the lack of good statistics at higher redshifts for both methods, only weak constraints on the cosmological parameters are obtained. However, assuming a flat universe and using the PCM, we derive the universe's matter density: Omega(m) = 0.32(-0.21) (+0.30) providing a new independent evidence for dark energy at the level of two sigma.

• 出版日期2017-2-1
• 单位中国地震局