On the shape of the light profiles of Early Type galaxies
On the shape of the light profiles of Early Type galaxies
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DOI：
10.1093/mnras/265.4.1013
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发表时间：
1993-09
影响因子：
4.8
通讯作者：
N. Caon;Massimo Capaccioli;M. D’Onofrio
中科院分区：
文献类型：
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作者：
N. Caon;Massimo Capaccioli;M. D’Onofrio
我们用幂律r 1/n得到了对椭圆星系和50星系的光度限制样本的光廓曲线的最佳拟合，使指数保持自由，而不是像著名的de Vaucouleurs公式那样将指数固定在1/n=1/4。在拟合公式中引入一个自由参数（范围从n=0.5 =0.3 kpc到n=16 =25 kpc）是合理的，因为n和全局星系参数之间存在良好的相关性，例如总光度和尺度半径。这一结果似乎与早期型星系的普通和明亮家族之间的性质分离一致，并对声称的星系轮廓形状相对于基本平面参数的独立性产生了影响
We have obtained the best fit to the light profiles of a luminosity-limited sample of elliptical and S0 galaxies with a power law r 1/n , letting the exponent remain free rather than keeping it fixed at 1/n=1/4 as in the well-known de Vaucouleurs formula. The introduction of a free parameter in the fitting formula (ranging from n=0.5 for =0.3 kpc to n=16 for =25 kpc) is justified by the existence of a good correlation between n and the global galaxian parameters, such as total luminosity and scale-radius. This result seems to be in line with the segregation of properties between the ordinary and bright families of early-type galaxies, and has consequences for the claimed independence of the shape of galaxy profiles with respect to the Fundamental Plane parameters