论文标题
形态计量法作为水母星系的演变探测
Morphometry as a probe of the evolution of jellyfish galaxies
论文作者
论文摘要
我们探讨了A901/A902多群集系统中73个RAM压力剥离候选者的形态计量学特性，Z $ \ sim $ 0.165，以表征水母星系的形态和结构演化。通过使用算法\ textsc {morfometryka}在哈勃太空望远镜（F606W）图像上使用算法\ textsc {morfometryka}对形态计量指标进行定量测量，我们提出了一种基于新的形态的方法，用于确定跟踪向量。我们研究了候选物的表面亮度曲线和曲率，并比较了两个分析包，即\ textsc {morfometryka}和\ textsc {iraf/ellipse}在检索银河系中存在的不规则结构的信息中。我们的形态分析表明，RAM压力剥离候选者的表面亮度曲线具有特殊的凹形区域。因此，这些曲线比其他没有显示RAM压力剥离的形态特征的星系的浓缩（Sérsic指数较低）。结合形态学轨迹向量，此功能既可以帮助识别经过ram压力剥离的星系，又可以揭示恒星形成速率的空间变化。
We explore the morphometric properties of a group of 73 ram pressure stripping candidates in the A901/A902 multi-cluster system, at z$\sim$0.165, to characterise the morphologies and structural evolution of jellyfish galaxies. By employing a quantitative measurement of morphometric indicators with the algorithm \textsc{morfometryka} on Hubble Space Telescope (F606W) images of the galaxies, we present a novel morphology-based method for determining trail vectors. We study the surface brightness profiles and curvature of the candidates and compare the results obtained with two analysis packages, \textsc{morfometryka} and \textsc{iraf/ellipse} on retrieving information of the irregular structures present in the galaxies. Our morphometric analysis shows that the ram pressure stripping candidates have peculiar concave regions in their surface brightness profiles. Therefore, these profiles are less concentrated (lower Sérsic indices) than other star forming galaxies that do not show morphological features of ram pressure stripping. In combination with morphometric trail vectors, this feature could both help identify galaxies undergoing ram-pressure stripping and reveal spatial variations in the star formation rate.
