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Using the Baryonic Tully–Fisher Relation to Measure H o
The Astronomical Journal ( IF 5.3 ) Pub Date : 2020-07-17 , DOI: 10.3847/1538-3881/ab9d88
James Schombert 1 , Stacy McGaugh 2 , Federico Lelli 3
Affiliation  

We explore the use of the baryonic Tully-Fisher relation (bTFR) as a new distance indicator. Advances in near-IR imaging and stellar population models, plus precise rotation curves, have reduced the scatter in the bTFR such that distance is the dominant source of uncertainty. Using 50 galaxies with accurate distances from Cepheids or tip magnitude of the red giant branch, we calibrate the bTFR on a scale independent of $H_o$. We then apply this calibrated bTFR to 95 independent galaxies from the SPARC sample, using CosmicFlows-3 velocities, to deduce the local value of $H_o$. We find $H_o$ = 75.1 +/- 2.3 (stat) +/- 1.5 (sys) km s$^{-1}$ Mpc$^{-1}$.

中文翻译:

使用重子 Tully-Fisher 关系测量 H o

我们探索使用重子 Tully-Fisher 关系 (bTFR) 作为新的距离指标。近红外成像和恒星群体模型的进步,加上精确的旋转曲线,减少了 bTFR 的散射,因此距离是不确定性的主要来源。使用 50 个距离造父变星或红巨星分支尖端星等精确距离的星系,我们在独立于 $H_o$ 的尺度上校准 bTFR。然后,我们使用 CosmicFlows-3 速度将这个校准的 bTFR 应用到来自 SPARC 样本的 95 个独立星系,以推导出 $H_o$ 的局部值。我们发现 $H_o$ = 75.1 +/- 2.3 (stat) +/- 1.5 (sys) km s$^{-1}$ Mpc$^{-1}$。
更新日期:2020-07-17
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