Searching for a possible dipole anisotropy in acceleration scale with 147 rotationally supported galaxies

Zhe Chang; Hai-Nan Lin; Zhi-Chao Zhao; Yong Zhou

doi:10.1088/1674-1137/42/11/115103

Chinese Physics C> 2018, Vol. 42> Issue(11) : 115103 DOI: 10.1088/1674-1137/42/11/115103

Searching for a possible dipole anisotropy in acceleration scale with 147 rotationally supported galaxies

Zhe Chang ^1,2 ,
Hai-Nan Lin ³ ,
Zhi-Chao Zhao ^1,2 ,
Yong Zhou ^1,2

1.
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
2.
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3.
Department of Physics, Chongqing University, Chongqing 401331, China

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Abstract：
We report a possible dipole anisotropy in acceleration scale g_† with 147 rotationally supported galaxies in the local Universe. It is found 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 correction is mostly induced by anisotropy in the acceleration scale. The magnitude of the ĝ_†-dipole reaches 0.25±0.04, and its direction is aligned to (l,b)=(171.30°±7.18°, -15.41°±4.87°), which is very close to the maximum anisotropy direction from the hemisphere comparison method. Furthermore, a robust check shows that the dipole anisotropy could not be reproduced by an isotropic mock data set. However, it is still premature to claim that the Universe is anisotropic, due to the small data samples and uncertainty in the current observations.
- galaxies:kinematics and dynamics ,
- galaxies:fundamental parameters ,
- large-scale structure of Universe

References

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Zhe Chang, Hai-Nan Lin, Zhi-Chao Zhao and Yong Zhou. Searching for a possible dipole anisotropy in acceleration scale with 147 rotationally supported galaxies[J]. Chinese Physics C, 2018, 42(11): 115103. doi: 10.1088/1674-1137/42/11/115103

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Received: 2018-07-27

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Supported by National Natural Science Foundation of China (11675182, 11690022, 11603005)

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Searching for a possible dipole anisotropy in acceleration scale with 147 rotationally supported galaxies

1. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

2. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

3. Department of Physics, Chongqing University, Chongqing 401331, China

Received Date: 2018-07-27

Available Online: 2018-11-05

Fund Project: Supported by National Natural Science Foundation of China (11675182, 11690022, 11603005)

Abstract: We report a possible dipole anisotropy in acceleration scale g_† with 147 rotationally supported galaxies in the local Universe. It is found 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 correction is mostly induced by anisotropy in the acceleration scale. The magnitude of the ĝ_†-dipole reaches 0.25±0.04, and its direction is aligned to (l,b)=(171.30°±7.18°, -15.41°±4.87°), which is very close to the maximum anisotropy direction from the hemisphere comparison method. Furthermore, a robust check shows that the dipole anisotropy could not be reproduced by an isotropic mock data set. However, it is still premature to claim that the Universe is anisotropic, due to the small data samples and uncertainty in the current observations.

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