旋转曲线中绝热收缩的检测
Detecting Adiabatic Contraction in Rotation Curves
摘要：
我们使用Blumenthal等人（1986）和Gnedin等人（2004）的公式研究了旋转收缩的Einasto剖面的结构及其对旋转曲线的影响。绝热收缩的晕在几乎所有的Einasto形状参数α值下都显示出约0.7+/-0.1的中心幂指数，并且根据双幂定律在~>1 kpc内很好地拟合。然而，试图拟合指数盘和未收缩的晕到螺旋收缩的旋转曲线产生盘质量和中心功率指数太大。我们还确定NGC 6503的旋转曲线是否显示绝热收缩的证据，使用以前公布的酒吧形成的限制，并发现NGC 6503最有可能有一个最小的收缩晕。然而，这一结论取决于正确选择的圆速度曲线。
英文摘要：
We examine the structure of adiabatically contracted Einasto profiles, using the prescriptions of Blumenthal et al. (1986) and Gnedin et al. (2004), and its impact on rotation curves. Adiabatically contracted halos display a central power index of ~0.7+/-0.1 for nearly all values of the Einasto shape parameter, alpha, and are well fit inside ~>1 kpc by double power laws. However, attempts to fit exponential disc and uncontracted halos to adiabatically contracted rotation curves yield disc masses and central power indices that are too large. We also determine whether or not the rotation curve of NGC 6503 displays evidence of adiabatic contraction using previously published bar formation constraints, and find that NGC 6503 most likely has a minimally contracted halo. However, this conclusion depends on the correct choice of circular velocity curve.
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