利用超深MHONGOOSE巡天揭示UGCA 250中的星系外气体
Uncovering Extraplanar Gas in UGCA 250 with the Ultra-deep MHONGOOSE Survey
AI总结：
本文利用MHONGOOSE巡天的HI观测数据，首次在侧向星系UGCA 250中探测到星系外气体，通过构建倾斜环模型揭示其厚盘结构，并指出该气体可能源于内部恒星反馈与外部潮汐相互作用的混合机制。
摘要：
我们利用作为MeerKAT HI Observations of Nearby Galactic Objects - Observing Southern Emitters (MHONGOOSE)巡天一部分的侧向星系UGCA 250中性原子氢（HI）观测数据，研究星系外气体的数量、形态和运动学。该巡天在广阔视场内结合了高柱密度灵敏度和高空间分辨率，非常适合研究控制星系外气体的底层物理机制。这些数据在视场内揭示了连同UGCA 250在内的9个额外探测源，其中8个处于该星系系统速度约200 km s$^{-1}$范围内。该星系似乎具有一个向南延伸至约41 kpc（投影距离）的尾状特征。我们还探测到一个具有异常速度的云，但未发现任何光学对应体。我们为这个侧向星系构建了详细的倾斜环模型，以更深入地了解其中性氢的垂直结构。与数据最匹配的模型具有一个标高约3$\pm$1 kpc的厚盘，其HI质量约占总HI质量的15$\\%$。这是首次在UGCA 250中探测到星系外气体。我们的分析支持UGCA 250中星系外气体具有混合起源的观点，可能源于内部恒星反馈和外部潮汐相互作用的共同结果。
英文摘要：
We use the neutral atomic hydrogen (HI) observations of the edge-on galaxy UGCA 250, taken as part of the MeerKAT HI Observations of Nearby Galactic Objects - Observing Southern Emitters (MHONGOOSE) survey to investigate the amount, morphology, and kinematics of extraplanar gas. The combination of high column density sensitivity and high spatial resolution of the survey over a large field of view is ideal for studying the underlying physics governing the extraplanar gas. These data reveal 9 additional detections within the field of view along with UGCA 250, with 8 of them being within $\sim$ 200 km s$^{-1}$ of the galaxy's systemic velocity. The galaxy seems to have a tail-like feature extending away from it in the southern direction up to $\sim$ 41 kpc (in projection). We also detect a cloud at anomalous velocities, but we did not find any optical counterpart. We construct a detailed tilted ring model for this edge-on galaxy to gain a deeper understanding of the vertical structure of its neutral hydrogen. The model that best matches the data features a thick disc with a scale height of $\sim$ 3$\pm$1 kpc and an HI mass of about 15$\%$ of the total HI mass. This extraplanar gas is detected for the first time in UGCA 250. Our analysis favours a mixed origin for the extraplanar gas in UGCA 250, likely arising from a combination of internal stellar feedback and external tidal interactions.
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