Dark matter mass loss in galaxy flybys: dependence on impact parameter

IF 0.8 4区 物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS
A. Mitravsinovi'c
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引用次数: 0

Abstract

Galaxy flybys, interactions where two independent halos inter-penetrate but detach at a later time and do not merge, occur frequently at lower redshifts. These interactions can significantly impact the evolution of individual galaxies from mass loss and shape transformation to the emergence of tidal features and the formation of morphological disc structures. The main focus of this paper is on the dark matter mass loss of the secondary, intruder galaxy, with the goal of determining a functional relationship between impact parameter and dark matter mass loss. Series of N-body simulations of typical galaxy flybys (10:1 mass ratio) with differing impact parameters show that dark matter halo leftover mass of intruder galaxy follows logarithmic growth law with impact parameter, regardless of the way total halo mass is estimated. Lost mass then, clearly, follows exponential decay law. Stellar component stretches faster as impact parameter decreases, following exponential decay law with impact parameter. Functional dependence on impact parameter in all cases seems universal, but fitting parameters are likely sensitive to interaction parameters and initial conditions (e.g. mass ratio of interacting galaxies, the initial relative velocity of intruder galaxy, interaction duration). While typical flybys, investigated here, could not be the sole culprit behind the formation of ultra-diffuse or dark matter deficient galaxies, their effects should not be disregarded as they can at least contribute substantially. Rare, atypical and stronger flybys are worth exploring further.
星系飞掠中的暗物质质量损失:对撞击参数的依赖
星系飞掠,两个独立的光晕相互渗透,但在稍后的时间分离而不合并的相互作用,经常发生在较低的红移。这些相互作用可以显著影响单个星系的演化,从质量损失和形状转变到潮汐特征的出现和形态盘结构的形成。本文主要关注次级侵入星系的暗物质质量损失,目的是确定撞击参数与暗物质质量损失之间的函数关系。一系列不同撞击参数下典型星系飞掠(质量比为10:1)的n体模拟表明,无论采用何种方式估算总晕质量,入侵星系的暗物质晕剩余质量都遵循随撞击参数的对数增长规律。显然,质量损失遵循指数衰减定律。随着冲击参数的减小,恒星成分的拉伸速度加快,且随冲击参数的增大呈指数衰减规律。在所有情况下,对冲击参数的函数依赖似乎是普遍的,但拟合参数可能对相互作用参数和初始条件(如相互作用星系的质量比、入侵星系的初始相对速度、相互作用持续时间)敏感。虽然这里研究的典型飞掠并不是形成超漫射星系或缺乏暗物质星系的唯一罪魁祸首,但它们的影响不应被忽视,因为它们至少可以做出实质性的贡献。罕见的,非典型的和更强的飞掠值得进一步探索。
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来源期刊
Serbian Astronomical Journal
Serbian Astronomical Journal ASTRONOMY & ASTROPHYSICS-
CiteScore
1.00
自引率
0.00%
发文量
6
审稿时长
12 weeks
期刊介绍: Serbian Astronomical Journal publishes original observations and researches in all branches of astronomy. The journal publishes: Invited Reviews - review article on some up-to-date topic in astronomy, astrophysics and related fields (written upon invitation only), Original Scientific Papers - article in which are presented previously unpublished author''s own scientific results, Preliminary Reports - original scientific paper, but shorter in length and of preliminary nature, Professional Papers - articles offering experience useful for the improvement of professional practice i.e. article describing methods and techniques, software, presenting observational data, etc. In some cases the journal may publish other contributions, such as In Memoriam notes, Obituaries, Book Reviews, as well as Editorials, Addenda, Errata, Corrigenda, Retraction notes, etc.
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