论文标题
Galaxy对目录中的真实星系合并
Real galaxy mergers from galaxy pair catalogs
论文作者
论文摘要
星系的合并是极端暴力事件，塑造了它们的进化。这些事件被认为会触发Starbursts，并可能引起黑洞的积聚。但是，仍然不清楚如何从给定时间可用的数据中了解星系对的命运，从而限制了我们限制合并确切作用的能力。在本文中，我们使用地平线模拟的灯酮，我们知道每对的命运，测试旨在识别真实合并对的三个选择过程。我们发现，最简单的一个（在预计距离$ d $和红移差$Δz$上选择对象在两个阈值之内）给出了比最复杂的结果（基于分析$ d $，$Δz$的神经网络，$Δz$，primary的红移，质量/恒星形成率/两个银河的宽高比）。我们最好的阈值是$ d_ \ mathrm {th} \ sim100 \ mathrm {\，kpc} $和$Δz_\ mathrm {th} \ sim 10^{ - 3} $，与最近的结果一致。
Mergers of galaxies are extremely violent events shaping their evolution. Such events are thought to trigger starbursts and, possibly, black hole accretion. Nonetheless, it is still not clear how to know the fate of a galaxy pair from the data available at a given time, limiting our ability to constrain the exact role of mergers. In this paper we use the lightcone of the Horizon-AGN simulation, for which we know the fate of each pair, to test three selection processes aiming at identifying true merging pairs. We find that the simplest one (selecting objects within two thresholds on projected distance $d$ and redshift difference $Δz$) gives similar results than the most complex one (based on a neural network analyzing $d$, $Δz$, redshift of the primary, masses/star formation rates/aspect ratio of both galaxies). Our best thresholds are $d_\mathrm{th}\sim100\mathrm{\, kpc}$ and $Δz_\mathrm{th} \sim 10^{-3}$, in agreement with recent results.
