AI 中文总结
该研究利用MIGHTEE巡天数据，探究低红移宇宙纤维对COSMOS和XMM-LSS场星系HI探测的影响，发现纤维会通过不同竞争过程影响星系HI气体库，效应随恒星质量和局部密度变化。
AI 中文摘要
宇宙纤维已被证实会影响星系演化，但它们与星系冷气体库的关联仍不明确，尤其是在低红移（$0.02<z<0.09$）下。本研究利用MeerKAT国际GHz分层河外探索（MIGHTEE）巡天在COSMOS和XMM-LSS场的数据，探究纤维对星系中性氢（HI）探测的影响。我们测量了暗能量光谱仪（DESI）巡天的光学星系中，HI发射探测占比随恒星质量、形态、局部密度及到最近纤维距离的变化关系。结果发现，更靠近纤维的星系具有更高的恒星质量、更高的局部密度和更大的早型星系占比，这些因素均会影响HI探测。在控制这些依赖关系后，纤维对HI探测存在可测量效应：低局部密度环境中的晚型星系，在所有恒星质量范围内，靠近纤维时的HI探测占比均降低，这暗示可能存在通过 ram 压剥离和宇宙网脱离导致的气体耗尽；大质量早型星系在纤维中的HI探测占比高于空洞中的，这暗示可能存在通过纤维吸积或富气并合实现的气体补充。我们的结果表明，宇宙纤维通过多种相互竞争的过程影响星系HI气体库，这些过程的相对重要性随恒星质量和局部密度变化。
英文摘要
Cosmic filaments have been recognised as influencing galaxy evolution, but their connection to galactic cold gas reservoirs is elusive, particularly at low redshifts. We investigate the influence of filaments on neutral hydrogen (HI) detections in galaxies at $0.02<z<0.09$, using the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) survey in the COSMOS and XMM-LSS fields. We measure the fraction of optical galaxies from the Dark Energy Spectroscopic Instrument (DESI) Survey detected in HI emission as a function of stellar mass, morphology, local density, and the distance to the nearest filament. We find that galaxies closer to filaments have higher stellar masses, higher local densities, and a larger early-type fraction, all of which affect the HI detection. After controlling for these dependencies, filaments have measurable effects on HI detection. Late-type galaxies in low-local density environments show reduced HI detection fractions close to filaments across all stellar mass ranges, suggesting potential gas depletion through ram pressure stripping and cosmic web detachment. Massive early-type galaxies show an enhanced HI detection fraction in filaments compared to the voids, suggesting possible gas replenishment through filamentary accretion or gas-rich mergers. Our results suggest that cosmic filaments influence galactic HI gas reservoirs through various competing processes, whose relative importance varies with stellar mass and local density.
Comments16 pages, 8 figures, submitted to MNRAS
