The Supernova Legacy Survey 3-year sample: Type Ia supernovae photometric distances and cosmological constraints ,
The Supernova Legacy Survey 3-year sample: Type Ia supernovae photometric distances and cosmological constraints ,
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DOI：
10.1051/0004-6361/201014468
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发表时间：
2010-10
影响因子：
6.5
通讯作者：
J. Guy;M. Sullivan;A. Conley;A. Conley;N. Regnault;P. Astier;C. Balland;C. Balland;S. Basa;R. Carlberg;D. Fouchez;D. Hardin;I. Hook;I. Hook;D. Howell;D. Howell;R. Pain;N. Palanque-Delabrouille;K. Perrett;K. Perrett;C. Pritchet;J. Rich;V. Ruhlmann-Kleider;D. Balam;S. Baumont;R. Ellis;R. Ellis;S. Fabbro;S. Fabbro;H. Fakhouri;N. Fourmanoit;S. González-Gaitán;M. Graham;E. Hsiao;T. Kronborg;C. Lidman;A. Mourão;S. Perlmutter;P. Ripoche;P. Ripoche;N. Suzuki;E. Walker
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文献类型：
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作者：
J. Guy;M. Sullivan;A. Conley;A. Conley;N. Regnault;P. Astier;C. Balland;C. Balland;S. Basa;R. Carlberg;D. Fouchez;D. Hardin;I. Hook;I. Hook;D. Howell;D. Howell;R. Pain;N. Palanque-Delabrouille;K. Perrett;K. Perrett;C. Pritchet;J. Rich;V. Ruhlmann-Kleider;D. Balam;S. Baumont;R. Ellis;R. Ellis;S. Fabbro;S. Fabbro;H. Fakhouri;N. Fourmanoit;S. González-Gaitán;M. Graham;E. Hsiao;T. Kronborg;C. Lidman;A. Mourão;S. Perlmutter;P. Ripoche;P. Ripoche;N. Suzuki;E. Walker
目标。本文介绍了超新星遗产巡天（SNLS）前三年发现的252颗高红移Ia型超新星（0.15 < z < 1.1）的光度特性和距离测量结果。这些事件被探测到，并使用加拿大-法国-夏威夷望远镜（CFHT）的MegaPrime/MegaCam仪器测量了它们的多色光变曲线，通过在四个波段重复成像四个一平方度的场。后续的光谱学是在VLT、双子座和凯克望远镜上进行的，以确认超新星的性质并测量它们的红移。方法.系统的不确定性所产生的光变曲线建模进行了研究，利用两种技术来推导出的峰值大小，形状和颜色的超新星，并利用一个精确的校准的SNLS领域。结果对231颗SNLS高红移Ia型超新星进行了平坦的ΛCDM宇宙学拟合，得到Ω M = 0.211 ± 0.034（stat）± 0.069（sys）。主要的系统不确定性来自光度校准中的不确定性。其次是光曲线拟合器的系统不确定性，对Ω_M的总贡献为± 0.026。没有发现明确的证据表明颜色-光度关系的斜率（β）可能随红移而演化。
Aims. We present photometric properties and distance measurements of 252 high redshift Type Ia supernovae (0.15 < z < 1.1) discovered during the first three years of the Supernova Legacy Survey (SNLS). These events were detected and their multi-colour light curves measured using the MegaPrime/MegaCam instrument at the Canada-France-Hawaii Telescope (CFHT), by repeatedly imaging four one-square degree fields in four bands. Follow-up spectroscopy was performed at the VLT, Gemini and Keck telescopes to confirm the nature of the supernovae and to measure their redshifts. Methods. Systematic uncertainties arising from light curve modeling are studied, making use of two techniques to derive the peak magnitude, shape and colour of the supernovae, and taking advantage of a precise calibration of the SNLS fields. Results. A flat ΛCDM cosmological fit to 231 SNLS high redshift type Ia supernovae alone gives Ω_M = 0.211 ± 0.034(stat) ± 0.069(sys). The dominant systematic uncertainty comes from uncertainties in the photometric calibration. Systematic uncertainties from light curve fitters come next with a total contribution of ± 0.026 on Ω_M. No clear evidence is found for a possible evolution of the slope (β) of the colour-luminosity relation with redshift.