论文标题
小型动力连贯性伴随着星系合规
Small-Scale Dynamical Coherence Accompanied with Galaxy Conformity
论文作者
论文摘要
最近报道了Galaxy旋转与邻居运动之间的相干性在1-MPC量表中的发现。在发现之后，我们研究了使用Calar Alto Legacy Integral Field Field Field Areverion（Califa）数据和NASA-Sloan Atlas（NSA）目录，我们研究了这种动力连贯性的邻居是否也呈现了星系符合性。我们测量了CALICA星系及其邻居之间G -R颜色的相关系数，作为星系合规性的定量指标。将邻居分为一致的移动和反互密的移动，相关系数相互比较，以相对亮度和投影距离的各种垃圾箱进行比较。在大多数情况下，即使对于抗缔合的邻居，Califa星系及其邻居在G -R颜色中也显示出正相关系数。但是，当邻居星系亮（Delta MR <= -1.0）和关闭（d <= 400 kpc）时，我们发现相干和抗增强邻居之间具有统计学意义（2.6 sigma）差异。也就是说，当它们明亮且靠近Califa星系时，相干移动的邻居与Califa星系相比表现出比反连续移动的邻居更强的。该结果支持小尺度的动力相干性可能源于星系相互作用，因为星系合规应该可以做到，这与先前研究的结论一致。
The discovery of the coherence between galaxy rotation and neighbor motion in 1-Mpc scales has been reported recently. Following up the discovery, we investigate whether the neighbors in such dynamical coherence also present galaxy conformity, using the Calar Alto Legacy Integral Field Area Survey (CALIFA) data and the NASA-Sloan Atlas (NSA) catalog. We measure the correlation coefficient of g - r colors between the CALIFA galaxies and their neighbors, as a quantitative indicator of galaxy conformity. The neighbors are divided into coherently moving and anti-coherently moving ones, the correlation coefficients from which are compared with each other, in various bins of relative luminosity and projected distance. In most cases, the CALIFA galaxies and their neighbors show positive correlation coefficients in g - r color, even for the anti-coherent neighbors. However, we find statistically significant (2.6-sigma) difference between coherent and anti-coherent neighbors, when the neighbor galaxies are bright (Delta Mr <= -1.0) and close (D <= 400 kpc). That is, when they are bright and close to the CALIFA galaxies, the coherently moving neighbors show stronger conformity with the CALIFA galaxies than the anti-coherently moving neighbors. This result supports that the small-scale dynamical coherence may originate from galaxy interactions as galaxy conformity is supposed to do, which agrees with the conclusion of the previous study.
