本地卷TiNy泰坦：本地宇宙中的气态矮-矮相互作用
Local Volume TiNy Titans: Gaseous Dwarf-Dwarf Interactions in the Local Universe
摘要：
在本文中，我们介绍了局域体积TiNy Titans样本（LV-TNT），这是一个更大的相互作用矮星系工作的一部分：TNT（Stierwalt et al. 2015）。该LV-TNT样品由本宇宙（距离银河系小于30 Mpc）中的10个矮星系对组成，它们的质量比M_（*，1）/M_（*，2）< 20，投影间距< 100 kpc，对成员质量log（M_*/M_Sun）< 9.9。所有10个LV-TNT对都已解析了它们的中性氢的合成图，它们位于一系列环境中，并在各种相互作用阶段被捕获。这使我们能够对矮-矮相互作用中的扩散气体进行比较研究，并将由于与大质量星系晕相互作用而损失的气体与由于矮相互作用而损失的气体分开。我们发现，中性气体是扩展的相互作用对相比，非成对的类似物，表明气体潮汐预处理。此外，我们发现，环境可以塑造的HI分布的形式拖尾的尾巴和气体是不受约束的，失去了周围环境，除非矮对是居住在附近的大质量星系。我们的结论是，附近的大质量宿主星系最终阻止了气体的重新吸积。因此，矮-矮相互作用代表了低质量星系重子循环的重要组成部分，使得气体在大距离处的“停车”成为持续的气体供应通道，直到被更大质量的宿主吸积。
英文摘要：
In this paper, we introduce the Local Volume TiNy Titans sample (LV-TNT), which is a part of a larger body of work on interacting dwarf galaxies: TNT (Stierwalt et al. 2015). This LV-TNT sample consists of 10 dwarf galaxy pairs in the Local Universe (< 30 Mpc from Milky Way), which span mass ratios of M_(*,1)/M_(*,2) < 20, projected separations < 100 kpc, and pair member masses of log(M_*/M_Sun) < 9.9. All 10 LV-TNT pairs have resolved synthesis maps of their neutral hydrogen, are located in a range of environments and captured at various interaction stages. This enables us to do a comparative study of the diffuse gas in dwarf-dwarf interactions and disentangle the gas lost due to interactions with halos of massive galaxies, from the gas lost due to mutual interaction between the dwarfs. We find that the neutral gas is extended in the interacting pairs when compared to non-paired analogs, indicating that gas is tidally pre-processed. Additionally, we find that the environment can shape the HI distributions in the form of trailing tails and that the gas is not unbound and lost to the surroundings unless the dwarf pair is residing near a massive galaxy. We conclude that a nearby, massive host galaxy is what ultimately prevents the gas from being reaccreted. Dwarf-dwarf interactions thus represent an important part of the baryon cycle of low mass galaxies, enabling the "parking" of gas at large distances to serve as a continual gas supply channel until accretion by a more massive host.
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