Ia型超新星光度与其周围环境的关系
Dependence of Type Ia supernova luminosities on their local environment
摘要：
我们提出了一个完全一致的目录的本地和全球性质的882 Ia型超新星（SNIa）的主机星系的光变曲线的基础上选择的属性，跨越红移范围$0.01 < z < 1.\text{}$这个目录对应于一个初步版本的编译样本，包括超新星遗产调查（SNLS）5年的数据，斯隆数字巡天（SDSS），和低红移调查。我们测量了SNLS和SDSS图像中的低和中等红移宿主星系测光，并使用光谱能量分布（SED）拟合技术来获得宿主属性，如恒星质量和$U-V$静止坐标系颜色;后者是星系中恒星星族的亮度加权年龄的指标。我们还估计了在3 kpc的适当距离半径内的超新星位置处的局部观测通量，并将它们转置成局部$U-V$静止坐标系颜色。根据主机测光质量选择SNIa，然后使用局部颜色作为第三标准化变量进行宇宙学拟合，我们将样本分为中值。我们发现一个地方的颜色步骤作为显着的最大质量阶跃效应。校正的最大质量阶跃校正，我们仍然发现一个显着的局部颜色效应，这表明，额外的信息是由SNIa的封闭环境提供的。从最初的选择进行了调查，我们讨论了宇宙学的可能影响。这对于即将进行的SNIa巡天，特别是对于大型综合巡天望远镜（LSST）来说，将是非常重要的，因为暗能量状态方程的不确定性将与本文报道的影响相当。
英文摘要：
We present a fully consistent catalog of local and global properties of host galaxies of 882 Type Ia supernovæ (SNIa) that were selected based on their light-curve properties, spanning the redshift range $0.01 < z < 1.\text{}$ This catalog corresponds to a preliminary version of the compilation sample and includes Supernova Legacy Survey (SNLS) 5-year data, Sloan Digital Sky Survey (SDSS), and low-redshift surveys. We measured low- and moderate-redshift host galaxy photometry in SNLS and SDSS images and used spectral energy distribution (SED) fitting techniques to derive host properties such as stellar mass and $U-V$ rest-frame colors; the latter are an indicator of the luminosity-weighted age of the stellar population in a galaxy. We also estimated the local observed fluxes at the supernova location within a proper distance radius of 3 kpc, and transposed them into local $U-V$ rest-frame colors. Selecting SNIa based on host photometry quality, we then performed cosmological fits using local color as a third standardization variable, for which we split the sample at the median value. We find a local color step as significant as the maximum mass step effect. Correcting for the maximum mass step correction, we still find a significant local color effect, which shows that additional information is provided by the close environment of SNIa. Departures from the initial choices were investigated, and we discuss the possible implications for cosmology. This will be of tremendous importance for the forthcoming SNIa surveys, and in particular for the Large Synoptic Survey Telescope (LSST), for which uncertainties on the dark energy equation of state will be comparable to the effects reported here.
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