星系动物园建造者：螺旋星系螺距角的形态依赖性
Galaxy Zoo Builder: Morphological Dependence of Spiral Galaxy Pitch Angle
摘要：
螺旋结构在宇宙中无处不在，螺旋星系中旋臂的俯仰角提供了一个重要的观测结果，有助于区分螺旋臂形成和演化的不同机制。在本文中，我们提出了一个分层贝叶斯方法来确定星系的俯仰角，使用通过银河建设者公民科学项目获得的旋臂数据。提出了一种新的方法来处理单个星系中不同臂之间俯仰角的大变化，该方法获得了参数的完整后验分布。我们利用我们的俯仰角来检查以前报道的凸起和酒吧的强度和俯仰角之间的联系，发现在我们的数据中没有相关性（与一个警告，我们使用的凸起大小和酒吧的强度不同于其他工作的观测代理）。我们测试了最近的螺旋臂缠绕模型，该模型预测了一些未知的上限和下限之间的节距角余切的均匀性，发现我们的观察结果与这种模型的瞬态和经常性的螺旋节距角一致，只要大多数缠绕螺旋消散或消失的节距角大于10度。
英文摘要：
Spiral structure is ubiquitous in the Universe, and the pitch angle of arms in spiral galaxies provide an important observable in efforts to discriminate between different mechanisms of spiral arm formation and evolution. In this paper, we present a hierarchical Bayesian approach to galaxy pitch angle determination, using spiral arm data obtained through the Galaxy Builder citizen science project. We present a new approach to deal with the large variations in pitch angle between different arms in a single galaxy, which obtains full posterior distributions on parameters. We make use of our pitch angles to examine previously reported links between bulge and bar strength and pitch angle, finding no correlation in our data (with a caveat that we use observational proxies for both bulge size and bar strength which differ from other work). We test a recent model for spiral arm winding, which predicts uniformity of the cotangent of pitch angle between some unknown upper and lower limits, finding our observations are consistent with this model of transient and recurrent spiral pitch angle as long as the pitch angle at which most winding spirals dissipate or disappear is larger than 10 degrees.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
