6dF星系巡天基面拟合的极大似然方法
Maximum likelihood method for fitting the Fundamental Plane of the 6dF Galaxy Survey
摘要：
我们使用了6dF星系巡天（6dFGS）中的10，000多个早期星系来构建光学和近红外通带的基本平面。我们证明，一个极大似然适合的星系的大小，表面亮度和速度色散的分布的多元高斯模型可以适当地考虑选择效应，审查和观测误差，导致精确和无偏的参数的基本面及其内在的散射。这种方法允许一个准确的和强大的确定的依赖关系的基本平面上的变化，恒星星族和环境的早期类型的星系。
英文摘要：
We have used over 10,000 early-type galaxies from the 6dF Galaxy Survey (6dFGS) to construct the Fundamental Plane across the optical and near-infrared passbands. We demonstrate that a maximum likelihood fit to a multivariate Gaussian model for the distribution of galaxies in size, surface brightness and velocity dispersion can properly account for selection effects, censoring and observational errors, leading to precise and unbiased parameters for the Fundamental Plane and its intrinsic scatter. This method allows an accurate and robust determination of the dependencies of the Fundamental Plane on variations in the stellar populations and environment of early-type galaxies.
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