发表机构
Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma; Centre for Astrophysics Research, University of Hertfordshire（霍默·L·道奇物理与天文学系，俄克拉荷马大学; 天体物理学研究中心，赫特福德大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用DESI早期数据构建最大矮星系对样本，发现矮星系相互作用驱动多种演化路径，包括触发恒星形成、尘埃遮蔽及快速熄灭，取决于质量、间距和环境。
AI 中文摘要
矮星系之间的相互作用是早期宇宙中星系演化的主要驱动因素，但关于其在不同质量、间距和环境中的影响的观测约束仍然稀缺。利用暗能量光谱仪器早期数据发布，本研究构建了最大的矮星系对样本，其恒星质量范围为 $6.5 \leq \log(M_\star/M_\odot) \leq 9.5$，红移范围为 $0.015 \leq z \leq 1.5$。我们分析了恒星形成速率和多波段颜色（$NUV-r$、$U$-$V$、$V$-$J$、$r$-$K$ 和 $g$-$r$）随投影间距、恒星质量和外部潮汐环境演化的规律。低质量/低红移星系对在中等间距处表现出相互作用触发的恒星形成。在最小间距（$\lesssim$10 kpc）处，这些系统表现出分歧行为：孤立星系对显示出尘埃遮蔽恒星形成的开始，嵌入弱外部潮汐场中的星系对经历持续的、无尘埃遮蔽的恒星形成，而嵌入强外部潮汐场中的星系对则经历恒星形成的快速熄灭。高质量/低红移星系对遵循更统一的演化轨迹，对环境依赖通常较弱。相互作用触发的恒星形成发生在中等间距处，随后在最小间距处尘埃遮蔽增加并快速熄灭。在较高红移处，高质量矮星系系统表现出恒星形成的初始抑制，随后在较小间距处活动恢复，这与早期气体移除和后期相互作用驱动的流入一致。这些结果表明，矮星系相互作用并不遵循单一的演化路径。相反，我们揭示了矮星系演化的复杂图景，对尘埃遮蔽恒星形成、突然熄灭以及致密、尘埃丰富、强烈恒星形成系统的形成具有重要意义。
英文摘要
Dwarf-dwarf interactions are a major driver of galaxy evolution in the early Universe, but observational constraints on their impact across mass, separation, and environment remain scarce. Using the Dark Energy Spectroscopic Instrument Early Data Release, this study constructs the largest sample of dwarf galaxy pairs, spanning stellar masses $6.5 \leq \log(M_\star/M_\odot) \leq 9.5$ and redshifts $0.015 \leq z \leq 1.5$. We analyze the evolution of star formation rates and multiwavelength colors ($NUV-r$, $U$-$V$, $V$-$J$, $r$-$K$, and $g$-$r$) as a function of projected separation, stellar mass, and external tidal environment. Low-mass/low-redshift pairs exhibit interaction-triggered star formation at intermediate separations. At the smallest separations ($\lesssim$10 kpc), these systems display divergent behavior: isolated pairs show the onset of dust-obscured star formation, those embedded in weak external tidal fields undergo extended, dust-unobscured star formation, while those embedded in strong external tidal fields experience rapid quenching of star formation. High-mass/low-redshift pairs follow a more uniform evolutionary track, with generally weaker dependence on environment. Interaction-triggered star formation occurs at intermediate separations, followed by increased dust obscuration and rapid quenching at the smallest separations. At higher redshifts, high-mass dwarf systems display an initial suppression of star formation, followed by renewed activity at smaller separations, consistent with early-stage gas removal and later interaction-driven inflows. These results demonstrate that dwarf-dwarf interactions do not follow a single evolutionary pathway. Instead, we reveal a complex picture of dwarf galaxy evolution, with significant implications for dust-obscured star formation, abrupt quenching, and the formation of compact, dusty, intensely star-forming systems.
Comments14 pages, 10 figures, accepted for publication in ApJ
