论文标题
带有Zwicky瞬态设施的统一IA型超新星距离梯子:基于红色巨型分支(TRGB)方法的绝对校准
A Uniform Type Ia Supernova Distance Ladder with the Zwicky Transient Facility: Absolute Calibration Based on the Tip of the Red Giant Branch (TRGB) Method
论文作者
论文摘要
据报道,当前由$ h_0 $的头固定的距离梯子测量与从宇宙微波背景(CMB)推论的值是张力的,假设是标准宇宙学。但是,红色巨型分支(TRGB)的一些提示报告与CMB的更好一致性报告了$ H_0 $。因此,减少本地测量中的系统不确定性以了解哈勃张力至关重要。在本文中,我们提出了第二和第三次梯级之间均匀的距离梯子,结合了由Zwicky瞬态设施(ZTF)观察到的SNE〜IA和其绝对光度的TRGB校准。来自\ emph {Same}调查的校准器和哈勃流量SNE〜IA的大型,限制的样品最大程度地减少了系统学的两个最大来源:宿主 - 半乳腺偏置和非均匀的光度校准。我们使用现有的TRGB距离到NGC7814中的ZTF SN〜IA SN 2021RHU(又名ZTF21ABIUVDK)的宿主星系的试点研究提出了结果。将ZTF校准器与ZTF Hubble Flow Sne〜ia的第一个数据发布中的体积限制样本相结合,我们推断出$ H_0 = 76.94 \ pm 6.4 \,{\ rm km} \,{\ rm s^{\ rm s^{ - 1}}}}}}}}} 测量。错误预算由单个对象校准了这项试验研究中的SN〜IA亮度。但是,ZTF样本已经在$ \ sim $ 20 MPC之内包含了其他五个SNE〜IA,可以使用HST获得TRGB距离。最后,我们介绍了将此距离梯子建造到80 MPC的前景,其JWST观察到了一百多个ZTF SNE〜IA。
The current Cepheid-calibrated distance ladder measurement of $H_0$ is reported to be in tension with the values inferred from the cosmic microwave background (CMB), assuming standard cosmology. However, some tip of the red giant branch (TRGB) estimates report $H_0$ in better agreement with the CMB. Hence, it is critical to reduce systematic uncertainties in local measurements to understand the Hubble tension. In this paper, we propose a uniform distance ladder between the second and third rungs, combining SNe~Ia observed by the Zwicky Transient Facility (ZTF) with a TRGB calibration of their absolute luminosity. A large, volume-limited sample of both calibrator and Hubble flow SNe~Ia from the \emph{same} survey minimizes two of the largest sources of systematics: host-galaxy bias and non-uniform photometric calibration. We present results from a pilot study using existing TRGB distance to the host galaxy of ZTF SN~Ia SN 2021rhu (aka ZTF21abiuvdk) in NGC7814. Combining the ZTF calibrator with a volume-limited sample from the first data release of ZTF Hubble flow SNe~Ia, we infer $H_0 = 76.94 \pm 6.4\, {\rm km}\,{\rm s^{-1}}\,{\rm Mpc^{-1}}$, an $8.3 \%$ measurement. The error budget is dominated by the single object calibrating the SN~Ia luminosity in this pilot study. However, the ZTF sample includes already five other SNe~Ia within $\sim$ 20 Mpc for which TRGB distances can be obtained with HST. Finally, we present the prospects of building this distance ladder out to 80 Mpc with JWST observations of more than one hundred ZTF SNe~Ia.