Distances to PHANGS Galaxies: New Tip of the Red Giant Branch Measurements and Adopted Distances
Distances to PHANGS Galaxies: New Tip of the Red Giant Branch Measurements and Adopted Distances
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到 PHANS 星系的距离：红巨星分支测量的新提示和采用的距离
DOI：
10.1093/mnras/staa3668
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发表时间：
2021
影响因子：
4.8
通讯作者：
Scheuermann, Fabian
中科院分区：
文献类型：
--
作者：
Anand, Gagandeep S;Lee, Janice C;Van Dyk, Schuyler D;Leroy, Adam K;Rosolowsky, Erik;Schinnerer, Eva;Larson, Kirsten;Kourkchi, Ehsan;Kreckel, Kathryn;Scheuermann, Fabian
PHANGS-HST是一个对38个百万秒差距内的旋涡星系进行的紫外光学成像巡天。结合PHANGS-ALMA，PHANGS-MUSE调查和其他多波长数据，该数据集将提供前所未有的研究，以了解这些附近恒星形成星系中的年轻恒星，Hiiregions和冷分子气体之间的联系。需要精确的距离来将测量到的可观测数据转换成物理参数（例如亮度到光度，分子云的角度到物理尺寸，星星集群和协会）。PHANGS-HST在F606 W和F814 W波段获得了星系晕的平行ACS成像。在可能的情况下，我们使用这些平行的领域，以获得尖端的红巨星分支（TRGB）的距离，这些星系。本文根据PHANGS-HST第一年的观测结果，给出了10个PHANGS星系的TRGB距离，从0.14 Mpc到0.15 Mpc。其中四个代表了第一次公布的TRGB距离测量（IC 5332，NGC 2835，NGC 4298和NGC 4321），其中七个是到这些目标的最佳距离。我们还提供了完整PHANGS样本中118个星系的距离汇编，这些样本已被首次PHANGS-ALMA公开数据发布所采用。
PHANGS-HSTis 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 data set will provide an unprecedented look into the connections between young stars, Hiiregions, 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-HSThas obtained parallel ACS imaging of the galaxy haloes 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 10 PHANGS galaxies from ∼4 to ∼15 Mpc, based on the first year of PHANGS-HSTobservations. Four of these represent the first published TRGB distance measurements (IC 5332, NGC 2835, NGC 4298, and NGC 4321), and seven 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.