天体物理距离尺度IV。F110W滤波器中JAGB方法零点的初步标定
Astrophysical Distance Scale IV. Preliminary Zero-Point Calibration of the JAGB Method in the HST/WFC3-IR Broad J-Band (F110W) Filter
摘要：
我们提出了一个绝对校准的J-区域渐近巨分支（JAGB）的方法，使用公布的光度学解析的恒星在20个附近的星系观察HST使用WFC 3-IR相机和F110 W（宽J波段）过滤器。每个星系的真实距离模数是基于Dalcanton等人（2012）统一确定的红巨星分支尖端（TRGB）方法。从一个由超过600万颗恒星组成的合成色星等图中，我们发现这些星系中有453颗JAGB星，M_{F110W} {JAGB} = -5.77 +/- 0.02等（平均值的统计误差）。在比较单个TRGB和JAGB模量时观察到的外部散射为+/-0.081 mag（或距离的4%）。这种散射的一些可以归因于少量的统计数据所产生的稀疏JAGB人口中发现的一般低光度星系，包括这里研究的特定样本。然而，如果JAGB和TRGB方法之间公平地共享这种方法间分散，这意味着每种方法都好到+/-0.06 mag，或者在距离上好于3%。
英文摘要：
We present an absolute calibration of the J-region Asymptotic Giant Branch (JAGB) method using published photometry of resolved stars in 20 nearby galaxies observed with HST using the WFC3-IR camera and the F110W (Broad J-Band) filter. True distance moduli for each of the galaxies are based on the Tip of the Red Giant Branch (TRGB) method as uniformly determined by Dalcanton et al. (2012). From a composite color-magnitude diagram composed of over 6 million stars, leading to a sample of 453 JAGB stars in these galaxies, we find M_{F110W}{JAGB} = -5.77 +/- 0.02 mag(statistical error on the mean). The external scatter seen in a comparison of the individual TRGB and the JAGB moduli is +/-0.081 mag (or 4% in distance). Some of this scatter can be attributed to small-number statistics arising from the sparse JAGB populations found in the generally low-luminosity galaxies that comprise the particular sample studied here. However, if this inter-method scatter is shared equitably between the JAGB and TRGB methods that implies that each are good to +/-0.06 mag, or better than 3% in distance.
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