由photometry $&$中心速度色散研究类锡星系的总质量分布
Total mass distributions of Sersic galaxies from photometry $&$ cent\ ral velocity dispersion
摘要：
我们开发了一种新的方法来寻找总质量密度分布在Sersic椭圆，约3倍的主轴有效半径，使用没有其他信息以外的通常是可用于遥远的星系，即观察到的表面亮度分布和中心速度色散$σ_0$。观测星系的光度密度分布是通过对测量的亮度分布进行反投影并通过基准的、阶梯函数形状的、$raw$质光比分布（$M/L$）对其进行缩放来提取的。然后根据建议的平滑处方对所得的原始的、不连续的、总的3-D质量密度轮廓进行平滑。该原始$M/L$的参数的特征在于通过在基于模型的研究中实施可观测量。完整的表征的形式主义提供作为一个功能的亮度分布和$σ_0$的测量。证明了该方法可以得到一组测试星系的质量密度分布，并成功地应用于提取NGC 3379和NGC 4499的引力质量分布，有效半径约为3。
英文摘要：
We develop a novel way of finding total mass density profiles in Sersic ellipticals, to about 3 times the major axis effective radius, using no other information other than what is typically available for distant galaxies, namely the observed surface brightness distribution and the central velocity dispersion $σ_0$. The luminosity density profile of the observed galaxy is extracted by deprojecting the measured brightness distribution and scaling it by a fiduciary, step-function shaped, $raw$ mass-to-light ratio profile ($M/L$). The resulting raw, discontinuous, total, 3-D mass density profile is then smoothed according to a proposed smoothing prescription. The parameters of this raw $M/L$ are characterised by implementing the observables in a model-based study. The complete characterisation of the formalism is provided as a function of the measurements of the brightness distribution and $σ_0$. The formalism, thus specified, is demonstrated to yield the mass density profiles of a suite of test galaxies and is successfully applied to extract the gravitational mass distribution in NGC 3379 and NGC 4499, out to about 3 effective radii.
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