Chicago-Carnegie Hubble Program（CCHP）状态报告：利用哈勃空间望远镜和詹姆斯·韦布空间望远镜测量哈勃常数
Status Report on the Chicago-Carnegie Hubble Program (CCHP): Measurement of the Hubble Constant Using the Hubble and James Webb Space Telescopes
AI总结：
CCHP利用JWST并结合HST校准TRGB与JAGB距离，给出近邻星系和SNe Ia的哈勃常数测量，结果与LambdaCDM一致。
摘要：
我们展示了 Chicago-Carnegie Hubble Program（CCHP）利用詹姆斯·韦布空间望远镜（JWST）数据测量哈勃常数的最新结果。整个项目旨在校准三种独立方法：（1）红巨星支尖（TRGB）恒星；（2）JAGB（J-Region Asymptotic Giant Branch，J区渐近巨星支）恒星；以及（3）造父变星。迄今为止，我们的项目包含10个近邻星系，其中拥有11颗适合测量哈勃常数（$H_0$）的Ia型超新星（SNe Ia）。项目还包括星系NGC 4258，其几何距离提供零点校准。本文讨论我们来自TRGB和JAGB方法的结果。我们目前最佳（最高精度）的估计是仅基于TRGB方法得到的 $H_0=70.39\pm1.22$（统计）$\pm1.33$（系统）$\pm0.70$（$\sigma_{SN}$），共使用来自HST和JWST数据的24个SN Ia校准体。仅基于我们新的JWST数据并与SNe Ia联结，我们得到TRGB方法的 $H_0=68.81\pm1.79$（统计）$\pm1.32$（系统），以及JAGB方法的 $H_0=67.80\pm2.17$（统计）$\pm1.64$（系统）km/s/Mpc。使用TRGB和JAGB方法测得的距离平均而言一致性优于1%，并且与SH0ES造父变星距离的一致性仅略高于1%的水平。我们的结果与当前标准LambdaCDM模型一致，无需引入额外的新物理。未来仍需JWST数据以提高本地距离尺度的精度和准确度。
英文摘要：
We present the latest results from the Chicago-Carnegie Hubble Program (\cchp) to measure the Hubble constant, using data from the James Webb Space Telescope (JWST). The overall program aims to calibrate three independent methods: (1) Tip of the Red Giant Branch (TRGB) stars, (2) JAGB (J-Region Asymptotic Giant Branch) stars, and (3) Cepheids. To date, our program includes 10 nearby galaxies, hosting 11 Type Ia supernovae (SNe Ia) suitable for measuring the Hubble constant ($H_0$). It also includes the galaxy NGC 4258, whose geometric distance provides the zero-point calibration. In this paper we discuss our results from the TRGB and JAGB methods. Our current best (highest precision) estimate is $H_0$ = 70.39 $\pm$ 1.22 (stat) $\pm$ 1.33 (sys) $\pm$ 0.70 ($σ_{SN}$), based on the TRGB method alone, with a total of 24 SN Ia calibrators from both HST and JWST data. Based on our new JWST data only, and tying into SNe Ia, we find values of $H_0$ = 68.81 $\pm$ 1.79 (stat) $\pm$ 1.32 (sys) for the TRGB, and $H_0$ = 67.80 $\pm$ 2.17 (stat) $\pm$ 1.64 (sys) km/s/Mpc for the JAGB method. The distances measured using the TRGB and the JAGB method agree, on average, at a level better than 1%, and with the SH0ES Cepheid distances at just over the 1% level. Our results are consistent with the current standard LambdaCDM model, without the need for the inclusion of additional new physics. Future JWST data will be required to increase the precision and accuracy of the local distance scale.
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