PHANGS-HST is an ultraviolet-optical imaging survey of 38 spiral galaxies within ~20 Mpc. Combined with the PHANGS-ALMA, PHANGS-MUSE surveys and other multiwavelength data, the dataset will provide an unprecedented look into the connections between young stars, HII regions, and cold molecular gas in these nearby star-forming galaxies. Accurate distances are needed to transform measured observables into physical parameters (e.g., brightness to luminosity, angular to physical sizes of molecular clouds, star clusters and associations). PHANGS-HST has obtained parallel ACS imaging of the galaxy halos in the F606W and F814W bands. Where possible, we use these parallel fields to derive tip of the red giant branch (TRGB) distances to these galaxies. In this paper, we present TRGB distances for 11 galaxies from ~4 to ~15 Mpc, based on the first year of PHANGS-HST observations. Five of these represent the first published TRGB distance measurements (IC 5332, NGC 2835, NGC 4298, NGC 4321, and NGC 4328), and eight of which are the best available distances to these targets. We also provide a compilation of distances for the 118 galaxies in the full PHANGS sample, which have been adopted for the first PHANGS-ALMA public data release.

中文翻译：

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到 Phangs 星系的距离：红巨星分支测量的新技巧和采用的距离

PHANGS-HST 是对约 20 Mpc 内 38 个螺旋星系的紫外光学成像调查。结合PHANGS-ALMA、PHANGS-MUSE调查和其他多波长数据，该数据集将提供对这些附近恒星形成星系中年轻恒星、HII区域和冷分子气体之间联系的前所未有的了解。需要精确的距离才能将测量到的可观测值转换为物理参数（例如，亮度到光度、角度到分子云、星团和协会的物理大小）。PHANGS-HST 获得了 F606W 和 F814W 波段星系晕的平行 ACS 成像。在可能的情况下，我们使用这些平行场来推导红巨星分支尖端 (TRGB) 到这些星系的距离。在本文中，我们展示了 11 个星系的 TRGB 距离，从 ~4 到 ~15 Mpc，基于 PHANGS-HST 观测的第一年。其中五个代表首次公布的 TRGB 距离测量值（IC 5332、NGC 2835、NGC 4298、NGC 4321 和 NGC 4328），其中八个是到这些目标的最佳可用距离。我们还提供了完整 PHANGS 样本中 118 个星系的距离汇编，这些距离已被首次用于 PHANGS-ALMA 公开数据发布。