论文标题
研究星系中螺旋模式的参数：手臂宽度
Investigation of the parameters of spiral pattern in galaxies: the arm width
论文作者
论文摘要
在这项工作中，我们确定面对面螺旋星系样品的螺旋结构参数。实际上，该问题的解决方案是一项艰巨的任务，因为观察到的螺旋结构特征的多样性，例如手臂数，它们的形状，手臂对比。在这项工作中，我们研究了基于垂直于手臂方向的光度削减的星系中的星系结构。该方法是基于这些切片的近似值，该切片具有分析函数和螺旋结构参数（手臂宽度，不对称性，俯仰角）的派生，并使用此近似的拟合参数。该算法已应用于不同通带的Sloan Digital Sky调查中选择的155个星系样本。在本文中，我们仅考虑手臂宽度上的结果：大多数螺旋形显示出与半乳突距离的宽度增加。在我们的样品中，只有14％的星系在所有半径上显示出相反的趋势或几乎恒定的手臂宽度。
In this work we determine the parameters of spiral structure for a sample of face-on spiral galaxies. In practice, the solution of this problem is a hard task because of the diversity of the observed characteristics of spiral structure, such as the arm number, their shape, arm contrast etc. In this work we study spiral structure in galaxies based on an analysis of photometric cuts perpendicular to the arm direction. The method is based on an approximation of these slices with an analytical function and derivation of the parameters of spiral structure (arm width, asymmetry, pitch angle) using the fitted parameters of this approximation. The algorithm has been applied to a sample of 155 galaxies selected from the Sloan Digital Sky Survey in different passbands. In this paper we only consider the results on the arm width: most spirals show an increase of their width with galactocentric distance. Only 14 per cent of galaxies in our sample show an opposite trend or have an almost constant arm width at all radii.
