测量部分耗尽的星系核心
Sizing up Partially-Depleted Galaxy Cores
摘要：
我们已经模拟了39个所谓的“核心”星系的核心Sersic模型的内表面亮度轮廓，并提供了新的物理参数的最大样本的“核心”星系适合这个模型。当存在时，同时对其他核成分进行建模，拟合的典型均方根离散度（约为10 arcsec）为0.02 mag/arcsec ^[2]。每个核心的断裂半径的模型独立估计示出同意从核心Sersic模型，并提供与Nuker模型的比较。我们发现在18%的样本中没有核心，这些样本在这里被重新归类为具有低n值（< ~ 4）的Sersic星系，因此内部轮廓斜率较浅。一般来说，n<3且sigma < 183 km/s的星系没有耗尽的核心。我们得到更新的核心Sersic破裂半径之间的关系，其相关的表面亮度，隆起光度，中心速度色散，并预测黑洞质量与耗尽的核心星系。除NGC 584外，我们确认了核心星系的内部负对数剖面斜率γ < ~ 0.3，其中6个> γ> -0.1。最后，中央恒星质量赤字被发现有一个典型的预期的中央黑洞质量的4倍内的值。
英文摘要：
We have modelled the inner surface brightness profiles of 39 alleged `core' galaxies with the core-Sersic model, and provide new physical parameters for the largest ever sample of `core' galaxies fit with this model. When present, additional nuclear components were simultaneously modelled and the typical rms scatter of the fits (out to ~10 arcsec) is 0.02 mag/arcsec^2. Model-independent estimates of each core's break radius are shown to agree with those from the core-Sersic model, and a comparison with the Nuker model is provided. We found an absence of cores in what amounts to 18% of the sample which are reclassified here as Sersic galaxies with low values of n (< ~ 4) and thus shallow inner profile slopes. In general, galaxies with n<3 and sigma < 183 km/s do not have depleted cores. We derive updated relations between core-Sersic break radii, their associated surface brightness, bulge luminosity, central velocity dispersion, and predicted black hole mass for galaxies with depleted cores. With the possible exception of NGC 584, we confirm that the inner negative logarithmic profile slopes gamma are < ~ 0.3 for the `core' galaxies, and 0 > gamma > -0.1 for six of these. Finally, the central stellar mass deficits are found to have values typically within a factor of 4 of the expected central black hole mass.
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