论文标题
与Gaia DR3一起移动集体中心半径
Moving groups across Galactocentric radius with Gaia DR3
论文作者
论文摘要
事实证明,太阳附近的恒星运动平面是必不可少的工具,可以解开我们银河系结构的复杂性(MW)。随着数据的不断提高,众多的运动恒星“移动组”的表征更好,并且继续发现新的恒星。在这里,我们提出了一种改进的方法,用于使用MGWave检测这些组,MGWave是我们开发的一种新的开源2D小波转换代码。我们的代码实现了与以前的小波软件相似的技术;但是,我们包括一种更强大的意义方法,还允许研究不足,这些方法最终可以提供有关MW非轴对称特征的进一步信息。将MGWave应用于Gaia(DR3)的最新数据发布时,我们检测到47组具有相干速度的恒星。除了确定三个其他重要候选者外,我们还重现了大多数先前检测到的移动组:一个在Arcturus内,在低$ v_r $的情况下没有太多的子结构。最后,我们遵循了这些恒星的关联,超出了太阳能邻域,从半半径为6.5至10 kpc。大多数检测到的基团在整个半径范围内扩展,表明它们是恒星流,这可能是由于MW的非轴对称特征。
The kinematic plane of stars near the Sun has proven an indispensable tool for untangling the complexities of the structure of our Milky Way (MW). With ever improving data, numerous kinematic "moving groups" of stars have been better characterized and new ones continue to be discovered. Here we present an improved method for detecting these groups using MGwave, a new open-source 2D wavelet transformation code that we have developed. Our code implements similar techniques to previous wavelet software; however, we include a more robust significance methodology and also allow for the investigation of underdensities which can eventually provide further information about the MW's non-axisymmetric features. Applying MGwave to the latest data release from Gaia (DR3), we detect 47 groups of stars with coherent velocities. We reproduce the majority of the previously detected moving groups in addition to identifying three additional significant candidates: one within Arcturus, and two in regions without much substructure at low $V_R$. Finally, we have followed these associations of stars beyond the solar neighborhood, from Galactocentric radius of 6.5 to 10 kpc. Most detected groups are extended throughout radius indicating that they are streams of stars possibly due to non-axisymmetric features of the MW.