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arXiv 2009.11289astro-ph.GAastro-ph.CO
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星系相互作用中空间分辨的恒星形成和燃料供给

Spatially resolved star formation and fuelling in galaxy interactions

Jorge Moreno, Paul Torrey, Sara L. Ellison, David R. Patton, Connor Bottrell, Asa F. L. Bluck, Maan H. Hani, Christopher C. Hayward, James S. Bullock, Philip F.… 展开作者

Jorge Moreno, Paul Torrey, Sara L. Ellison, David R. Patton, Connor Bottrell, Asa F. L. Bluck, Maan H. Hani, Christopher C. Hayward, James S. Bullock, Philip F. Hopkins, Lars Hernquist

摘要:

我们研究了相互作用星系中恒星形成和星际介质的空间结构和演化。我们使用了一套广泛的秒差距尺度的星系合并模拟(恒星质量比= 2.5:1),它采用了“反馈在现实环境中-”模型(火-2)。这个框架解决了恒星的形成,反馈过程,和ISM的多阶段结构。我们专注于相互作用的星系对阶段。我们发现,近距离接触大大增加了冷(HI)和冷密度(H2)气体的预算,从而提高了新恒星的形成。这种增强在次级星系中集中在中心,而在主星系中径向扩展得更多。这种行为是弱依赖于轨道几何形状。我们还发现,具有升高的全球恒星形成率(SFR)的星系经历强烈的核SFR增强,由高水平的恒星形成效率(SFE)或可用的冷致密气体燃料驱动。全球SFR受抑制的Galerkin也包含一个核冷致密气藏,但低SFE水平减少了中部地区的SFR。具体地说,在大多数情况下,中央千秒差距的SFR增强是燃料驱动的(次级55%,初级71%)-而中央SFR抑制是效率驱动的(次级91%,初级97%)。我们的数值预测强调了需要更大的,和/或合并专用的,空间分辨的星系调查-能够检查相互作用系统的大量和不同的样本-再加上多波长活动,旨在捕捉其内部ISM结构。

英文摘要:

We investigate the spatial structure and evolution of star formation and the interstellar medium (ISM) in interacting galaxies. We use an extensive suite of parsec-scale galaxy merger simulations (stellar mass ratio = 2.5:1), which employs the "Feedback In Realistic Environments-" model (fire-2). This framework resolves star formation, feedback processes, and the multi-phase structure of the ISM. We focus on the galaxy-pair stages of interaction. We find that close encounters substantially augment cool (HI) and cold-dense (H2) gas budgets, elevating the formation of new stars as a result. This enhancement is centrally-concentrated for the secondary galaxy, and more radially extended for the primary. This behaviour is weakly dependent on orbital geometry. We also find that galaxies with elevated global star formation rate (SFR) experience intense nuclear SFR enhancement, driven by high levels of either star formation efficiency (SFE) or available cold-dense gas fuel. Galaxies with suppressed global SFR also contain a nuclear cold-dense gas reservoir, but low SFE levels diminish SFR in the central region. Concretely, in the majority of cases, SFR-enhancement in the central kiloparsec is fuel-driven (55% for the secondary, 71% for the primary) -- whilst central SFR-suppression is efficiency-driven (91% for the secondary, 97% for the primary). Our numerical predictions underscore the need of substantially larger, and/or merger-dedicated, spatially-resolved galaxy surveys -- capable of examining vast and diverse samples of interacting systems -- coupled with multi-wavelength campaigns aimed to capture their internal ISM structure.

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