论文标题
天体物理距离量表III:使用红色巨型分支,头孢虫和JAGB恒星的多波长观察到与当地组的Galaxy WLM的距离
The Astrophysical Distance Scale III: Distance to the Local Group Galaxy WLM using Multi-Wavelength Observations of the Tip of the Red Giant Branch, Cepheids, and JAGB Stars
论文作者
论文摘要
哈勃常数的局部确定位于十字路口。宇宙局部膨胀速率的当前估计值差异约1.7 sigma,这些估计是源自Cepheid和基于TRGB的校准,用于IA型超新星。为了帮助阐明导致张力的系统误差的可能来源,我们在这项研究中显示了最近开发的距离指标J-Region渐近巨型分支(JAGB)方法(ARXIV:2005.10792),可以用作独立的交叉检查,并与其他局部距离指标进行比较。此外,我们证明JAGB方法作为IA型超新星的独立,精确和准确的校准器具有巨大的潜力,用于测定H0。使用本地组星系WLM,我们提出JAGB方法之间的距离比较,近红外(JHK)波长的TRGB测量,光学I频段中的TRGB测量以及多波长的头孢杆菌周期透光度关系确定。 We find: $μ_0$ (JAGB) = 24.97 +/- 0.02 (stat) +/- 0.04 (sys) mag, $μ_0$ (TRGB NIR) = 24.98 +/- 0.04 stat) +/- 0.07 (sys) mag, $μ_0$ (TRGB F814W) = 24.93 +/- 0.02 (stat) +/- 0.06 (sys) mag,$μ_0$(cepheids)= 24.98 +/- 0.03(stat)+/- 0.04(sys)mag。所有四种方法都符合良好的一致性,证实了在3%级别的四个距离尺度的局部自谐度,并增强了对JAGB方法的准确和精确的距离指示器与其他三种基于天体物理学的方法中的任何一个。
The local determination of the Hubble Constant sits at a crossroad. Current estimates of the local expansion rate of the Universe differ by about 1.7-sigma, derived from the Cepheid and TRGB based calibrations, applied to type Ia supernovae. To help elucidate possible sources of systematic error causing the tension, we show in this study the recently developed distance indicator, the J-region Asymptotic Giant Branch (JAGB) method (arXiv:2005.10792), can serve as an independent cross-check and comparison with other local distance indicators. Furthermore, we make the case that the JAGB method has substantial potential as an independent, precise and accurate calibrator of type Ia supernovae for the determination of H0. Using the Local Group galaxy, WLM we present distance comparisons between the JAGB method, a TRGB measurement at near-infrared (JHK) wavelengths, a TRGB measurement in the optical I band, and a multi-wavelength Cepheid period-luminosity relation determination. We find: $μ_0$ (JAGB) = 24.97 +/- 0.02 (stat) +/- 0.04 (sys) mag, $μ_0$ (TRGB NIR) = 24.98 +/- 0.04 stat) +/- 0.07 (sys) mag, $μ_0$ (TRGB F814W) = 24.93 +/- 0.02 (stat) +/- 0.06 (sys) mag, $μ_0$ (Cepheids) = 24.98 +/- 0.03 (stat) +/- 0.04 (sys) mag. All four methods are in good agreement, confirming the local self-consistency of the four distance scales at the 3% level, and adding confidence that the JAGB method is as accurate and as precise a distance indicator as either of the other three astrophysically-based methods.