Searching for a possible dipole anisotropy in acceleration scale with 147 rotationally supported galaxies
Searching for a possible dipole anisotropy in acceleration scale with 147 rotationally supported galaxies
复制标题
在 147 个旋转支撑星系的加速尺度中寻找可能的偶极子各向异性
DOI：
10.1088/1674-1137/42/11/115103
复制
发表时间：
2018
影响因子：
3.6
通讯作者：
Zhou Y.
中科院分区：
文献类型：
--
作者：
Chang Z.;Lin H.-N.;Zhao Z.-C.;Zhou Y.
在具有147个旋转支撑星系的局部宇宙中，我们报道了在加速度尺度$g_{\dag}$上的偶极各向异性。我们发现单极子和偶极子对径向加速度关系的修正能更好地描述SPARC数据集。单极项可以忽略不计，但偶极量级是显著的。偶极各向异性主要是由加速度尺度的空间变化引起的。偶极子$g_{\dag}$-的星等达到$0.25\pm0.04$，其方向对准$(l,b) = (171.40^{\circ}\pm7.34^{\circ}, -15.30^{\circ}\pm4.82^{\circ})$，非常接近半球比较法得到的最大各向异性方向。此外，鲁棒性检验表明，各向同性模拟数据集不能再现偶极子各向异性。如果各向异性信号是真实的，它可能提供一种测试宇宙各向异性的新方法。
We report a dipole anisotropy on acceleration scale $g_{\dag}$ in local universe with 147 rotationally supported galaxies. We find that a monopole and dipole correction for the radial acceleration relation can better describe the SPARC data set. The monopole term is negligible but the dipole magnitude is significant. It is also found that the dipole anisotropy is mostly induced by spatial variation of the acceleration scale. The magnitude of $g_{\dag}$-dipole reaches up to $0.25\pm0.04$, and its direction is aligned to $(l,b) = (171.40^{\circ}\pm7.34^{\circ}, -15.30^{\circ}\pm4.82^{\circ})$, which is very close to the maximum anisotropy direction from the hemisphere comparison method. Furthermore, robust check shows that the dipole anisotropy couldn't be reproduced by isotropic mock data set. If the anisotropy signal is real, it may provide a new method to test the cosmological anisotropy.