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arXiv 2007.00581astro-ph.GAastro-ph.CO
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基于图论的朋友之友算法的2MASS红移巡天星系群星表

The 2MASS redshift survey galaxy group catalogue derived from a graph-theory based friends-of-friends algorithm

T. S. Lambert, R. C. Kraan-Korteweg, T. H. Jarrett, L. M. Macri

摘要:

我们提出了最近完成的2MASS红移巡天(2MRS,Macri2019)的星系群目录,其中包括44572个红移,包括1041个主要位于回避区的星系的新测量。星系群目录是使用一种新的,基于图论的,修改版本的朋友圈算法产生的。几个图论的例子在本文中,包括一个新的方法来确定组内的子结构。的结果和图论方法已被彻底审问对以前的2MRS组目录和理论天体物理观测台(TAO)模拟利用先进的可视化技术,包括沉浸式设施,数字天文馆,和虚拟现实。这导致了一个稳定和强大的目录,天空位置和视线距离分别在0.5 Mpc和2 Mpc以内,并恢复了所有主要的星系群和星系团。最终的星表包含3022个星系群,是迄今为止最完整的“全天空”星系群星表。我们确定了这些群体的三维位置,以及它们的光度和共动距离,观测和校正的成员数,丰富度度量,速度色散,以及$R_{200}$和$M_{200}$的估计。我们提出了三个额外的数据产品,即2MRS星系中发现的群体,一个目录的子组,和一个目录的687个新的组候选人没有对应的在以前的2MRS为基础的分析。

英文摘要:

We present the galaxy group catalogue for the recently-completed 2MASS Redshift Survey (2MRS, Macri2019) which consists of 44572 redshifts, including 1041 new measurements for galaxies mostly located within the Zone of Avoidance. The galaxy group catalogue is generated by using a novel, graph-theory based, modified version of the Friends-of-Friends algorithm. Several graph-theory examples are presented throughout this paper, including a new method for identifying substructures within groups. The results and graph-theory methods have been thoroughly interrogated against previous 2MRS group catalogues and a Theoretical Astrophysical Observatory (TAO) mock by making use of cutting-edge visualization techniques including immersive facilities, a digital planetarium, and virtual reality. This has resulted in a stable and robust catalogue with on-sky positions and line-of-sight distances within 0.5 Mpc and 2 Mpc, respectively, and has recovered all major groups and clusters. The final catalogue consists of 3022 groups, resulting in the most complete "whole-sky" galaxy group catalogue to date. We determine the 3D positions of these groups, as well as their luminosity and comoving distances, observed and corrected number of members, richness metric, velocity dispersion, and estimates of $R_{200}$ and $M_{200}$. We present three additional data products, i.e. the 2MRS galaxies found in groups, a catalogue of subgroups, and a catalogue of 687 new group candidates with no counterparts in previous 2MRS-based analyses.

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。

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