AI 中文总结
该研究结合LGLBS的HI数据与多波段星图，分析六个本星系星系气体、恒星等径向分布，发现原子气体盘最延展，$\Sigma_{\rm HI}$分布特点及局部结构，给出气体消耗时间等，公开多波长数据为相关研究提供参考。
AI 中文摘要
目前仅对距离极近的星系才能以$\lesssim100$ pc的物理分辨率分辨出原子气体。我们将来自本星系群L波段巡天（LGLBS）首次数据发布的、使用卡尔·G·扬斯基甚大阵列（VLA）获得的120 pc分辨率的HI数据，与经过统一处理的红外、紫外、H$\alpha$和CO星图相结合。我们分析了六个本星系星系（M31、M33、IC 10、IC 1613、NGC 6822和WLM）的气体、恒星和近期恒星形成的径向分布。在整个样本中，原子气体盘是最延展的成分，矮星系中$r_{\rm HI}=2.8$ - $5.8$ kpc，M33和M31中为13 - 26 kpc。方位平均的$\Sigma_{\rm HI}$分布通常是平坦的或仅缓慢下降，相比之下$\Sigma_{\star}$和$\Sigma_\mathrm{SFR}$下降更陡，外部HI标度长度为$l_{\rm HI}^{\rm outer}\approx1.0$ - $8.5$ kpc。120 pc尺度上质量加权的HI面密度通常比方位平均值高10 - 70%，表明即使方位平均分布看起来平滑，局部高柱密度原子结构依然存在。原子气体消耗时间从恒星半质量半径内的$\tau_{\rm dep}^{\rm atom}\approx0.8$ - 17 Gyr增加到外盘中的数十至100 Gyr。分子消耗时间更短。我们公开了这些多波长数据，为LGLBS目标提供了有价值的参考，也为一篇关于120 pc尺度上恒星形成、气相和中平面压力关系的配套论文奠定了基础。
英文摘要
Resolving atomic gas at $\lesssim100$ pc physical resolution is currently feasible only for the very nearest galaxies. We combine 120 pc resolution HI data using the Karl G. Jansky Very Large Array (VLA) from the first data release of the Local Group L-Band Survey (LGLBS) with uniformly processed infrared, ultraviolet, H$α$, and CO maps. We analyze the radial profiles of gas, stars, and recent star formation for six local galaxies: M31, M33, IC 10, IC 1613, NGC 6822, and WLM. Across the sample, atomic-gas disks are the most extended component, reaching $r_{\rm HI}=2.8$-$5.8$ kpc in the dwarfs and $13$-$26$ kpc in M33 and M31. Azimuthally averaged $Σ_{\rm HI}$ profiles are often flat or only slowly declining compared to the steeper decline of $Σ_{\star}$ and $Σ_\mathrm{SFR}$, with outer HI scale lengths of $l_{\rm HI}^{\rm outer}\approx1.0$-$8.5$ kpc. The mass-weighted HI surface densities on 120 pc scale generally exceed the azimuthally averaged values by 10-70%, showing that localized high-column-density atomic structures persist even where azimuthally averaged profiles appear smooth. Atomic-gas depletion times rise from $τ_{\rm dep}^{\rm atom}\approx0.8$-17 Gyr within the stellar half-mass radius to 10s-100 Gyr in the outer disks. Molecular depletion times are shorter. We provide a public release of these multi-wavelength data, which provide a valuable reference for the LGLBS targets and also form the basis for a companion paper that relates star formation, gas phases, and midplane pressure on 120 pc scales.
CommentsAccepted for publication in ApJS; 21 pages, 12 figures, 6 tables Public avaible data under: https://dx.doi.org/10.11570/26.0020
