Journal
ASTROPHYSICAL JOURNAL
Volume 779, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/779/2/160
Keywords
cosmology: observations; large-scale structure of universe; methods: statistical
Categories
Funding
- National Science Foundation of China [11203054, 10925314, 11128306, 11121062, 11233005, 11073017]
- CAS/SAFEA International Partnership Program for Creative Research Teams [KJCX2-YW-T23]
- Shanghai Committee of Science and Technology, China [12ZR1452800]
- NSF [AST-0908334, AST-1109354]
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- [NCET-11-0879]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1109354] Funding Source: National Science Foundation
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Using a sample of galaxy groups selected from the Sloan Digital Sky Survey Data Release 7, we examine the alignment between the orientation of galaxies and their surrounding large-scale structure in the context of the cosmic web. The latter is quantified using the large-scale tidal field, reconstructed from the data using galaxy groups above a certain mass threshold. We find that the major axes of galaxies in filaments tend to be preferentially aligned with the directions of the filaments, while galaxies in sheets have their major axes preferentially aligned parallel to the plane of the sheets. The strength of this alignment signal is strongest for red, central galaxies, and in good agreement with that of dark matter halos in N-body simulations. This suggests that red, central galaxies are well aligned with their host halos, in quantitative agreement with previous studies based on the spatial distribution of satellite galaxies. There is a luminosity and mass dependence that brighter and more massive galaxies in filaments and sheets have stronger alignment signals. We also find that the orientation of galaxies is aligned with the eigenvector associated with the smallest eigenvalue of the tidal tensor. These observational results indicate that galaxy formation is affected by large-scale environments and strongly suggest that galaxies are aligned with each other over scales comparable to those of sheets and filaments in the cosmic web.
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