论文标题
在低红移处搜索依赖距离的Baryonic Tully-Fisher关系
Search for a distance-dependent Baryonic Tully-Fisher Relation at low redshifts
论文作者
论文摘要
最近的一项工作（Arxiv：2104.14481）发现了使用低红移数据（$ z <0.1 $）在Baryonic Tully-Fisher关系（BTFR）中具有统计学意义的过渡，其过渡发生在9和17 MPC。在这一发现的激励下，我们通过将数据拟合到增强的BTFR来进行此分析的变体，在该增强的BTFR中，指数和归一化均与距离的函数变化。我们发现，指数和归一化常数仅显示出距离的边缘变化，并且与恒定值一致，达到$2σ$。我们还检查了以9和17 mpc的距离分叉数据集后BTFR结果之间是否存在统计学上的显着差异。我们发现，几乎所有的子样本都以$χ^2 $/dof接近1的范围遵守BTFR，并且在整个子样本中保持一致的最佳拟合参数。只有$ d <17 $ mpc的子样本就BTFR显示出边缘差异（$1.75σ$）。因此，我们找不到在9和17 MPC距离内BTFR上统计学上显着差异的任何证据。
A recent work (arXiv:2104.14481) has found a statistically significant transition in the Baryonic Tully-Fisher relation (BTFR) using low redshift data ($z<0.1$), with the transitions occurring at about 9 and 17 Mpc. Motivated by this finding, we carry out a variant of this analysis by fitting the data to an augmented BTFR, where both the exponent as well as normalization constant vary as a function of distance. We find that both the exponent and normalization constant show only a marginal variation with distance, and are consistent with a constant value, to within $2σ$. We also checked to see if there is a statistically significant difference between the BTFR results after bifurcating the dataset at distances of 9 and 17 Mpc. We find that almost all the sets of subsamples obey the BTFR with $χ^2$/dof close to 1 and the best-fit parameters consistent across the subsamples. Only the subsample with $D<17$ Mpc shows a marginal discrepancy (at $1.75σ$) with respect to the BTFR. Therefore, we do not find any evidence for statistically significant differences in the BTFR at distances of 9 and 17 Mpc.
