SPIN ALIGNMENTS OF SPIRAL GALAXIES WITHIN THE LARGE-SCALE STRUCTURE FROM SDSS DR7

被引：75

作者：

Zhang, Youcai ^{[1
]}

Yang, Xiaohu ^{[1
,2
]}

Wang, Huiyuan ^{[3
,4
]}

Wang, Lei ^{[5
]}

Luo, Wentao ^{[1
]}

Mo, H. J. ^{[4
]}

van den Bosch, Frank C. ^{[6
]}

机构：

[1] Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China

[2] Shanghai Jiao Tong Univ, Ctr Astron & Astrophys, Shanghai 200240, Peoples R China

[3] Univ Sci & Technol China, Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China

[4] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA

[5] Purple Mt Observ, Partner Grp MPI Astron, Nanjing 210008, Jiangsu, Peoples R China

[6] Yale Univ, Dept Astron, New Haven, CT 06520 USA

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 798卷 / 01期

基金：

美国国家科学基金会;

关键词：

cosmology: observations; large-scale structure of universe; methods: statistical; DIGITAL SKY SURVEY; DARK-MATTER HALOES; TIDAL-TORQUE THEORY; ANGULAR-MOMENTUM; COSMIC WEB; DATA RELEASE; FILAMENTS; ORIENTATION; VOIDS; CLUSTERS;

D O I：

10.1088/0004-637X/798/1/17

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using a sample of spiral galaxies selected from the Sloan Digital Sky Survey Data Release 7 and Galaxy Zoo 2, we investigate the alignment of spin axes of spiral galaxies with their surrounding large-scale structure, which is characterized by the large-scale tidal field reconstructed from the data using galaxy groups above a certain mass threshold. We find that the spin axes only have weak tendencies to be aligned with (or perpendicular to) the intermediate (or minor) axis of the local tidal tensor. The signal is the strongest in a cluster environment where all three eigenvalues of the local tidal tensor are positive. Compared to the alignments between halo spins and the local tidal field obtained in N-body simulations, the above observational results are in best agreement with those for the spins of inner regions of halos, suggesting that the disk material traces the angular momentum of dark matter halos in the inner regions.

引用

页数：8

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