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arXiv 2410.04411astro-ph.GA
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一种定义“银河系类似星系(Milky Way galaxies-analogues)”的先进方法

An advanced approach for definition of the "Milky Way galaxies-analogues"

Iryna B. Vavilova, Petr M. Fedorov, Daria V. Dobrycheva, Olga Sergijenko, Anatolii A. Vasylenko, Artem M. Dmytrenko, Vlad P. Khramtsov, Olena V. Kompaniiets

AI总结:

本研究针对银河系类似星系(MWAs)搜寻中参数约束不足的问题,提出扩充银河系特征数量、在共动宇宙体积内构建多类MWAs样本并优化的方法,以明确MWAs探测的充要条件并揭示银河系多波段特征。

摘要:

我们的星系——银河系——具有特定的结构与演化特征。在搜寻银河系类似星系(Milky Way galaxies-analogues,简称MWAs)时,通常会考虑形态、光度、运动学以及化学动力学性质。若能以更多同步选择参数、且对各参数设置更严格的约束来发现MWA星系,得到的MWA星系样本其性质会更接近银河系的真实性质。因此总体而言,人们会将银河系的各类参数(如形态类型、光度、色指数、结构参数(尺度、棒、核球、薄盘与厚盘、内环、晕)、核球占总质量比、恒星质量、恒星形成率、金属丰度以及旋转速度)以不同组合形式,用于与其他星系进行比较。然而,银河系的部分特征在MWAs特征的多参数空间中应当存在显著偏移。本文旨在简要概述该问题的研究现状,并介绍我们用于研究银河系与MWAs匹配特征的方法(本项目由乌克兰国家研究基金资助)。我们提出要尽可能扩充银河系特征的数量,并在我们的共动宇宙学体积内构建不同的MWAs样本,以便后续对样本进行优化。这类特征可包括特定区域内恒星运动的三维运动学、外围低氧含量、低核活动,以及过去100亿年(10 Gyrs)内未发生显著并合(孤立判据)。该方法将能够广泛地明确探测MWA星系的充要条件,同时揭示银河系的其他多波段特征。

英文摘要:

Our Galaxy - the Milky Way - has certain features of the structure and evolution. The morphological, photometric, kinematic, and chemodynamical properties are usually considered in the search for the Milky Way galaxies-analogues (MWAs). The discovery of MWA galaxies with a larger number of simultaneous selection parameters and more stringent constraints on a given parameter yields a sample of MWA galaxies with properties closer to the true properties of the Milky Way. So, in general, such MW parameters as the morphological type, luminosity, color indices, structural parameters (size, bar, bulge, thin and thick disks, inner ring, halo), bulge to total ratio, stellar mass, star formation rate, metallicity, and rotation velocity were used in various combinations for comparison with other galaxies. However, the offset of some MW features in the multiparameter space of MWAs features should be significant. The paper aims to give a brief overview of the problematics and to present our approach for studying Milky Way and MWAs matching characteristics (this project is supported by the National Research Fund of Ukraine). We propose to enlarge as much as possible the number of Milky Way features and compile various samples of MWAs in our comoving cosmological volume for their further optimization. Such features can include 3Dkinematics of star's movement in certain regions, low oxygen content on the periphery, low nuclear activity, and the lack of significant merging over the past 10 Gyrs (isolation criterion). This approach will make it possible to widely formulate the necessary and sufficient conditions for the detection of MWA galaxies as well as to reveal other MW multiwavelength features.

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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