期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 414, 期 3, 页码 2029-2039出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2011.18518.x
关键词
galaxies: groups: general; dark matter; large-scale structure of Universe
资金
- CONICET
- SECyT
- Universidad Nacional de Cordoba
- Fondecyt [1071006]
- FONDAP [CFA 15010003]
- BASAL [CATA PFB-06]
In this paper we analyse the alignment of galaxy groups with the surrounding large scale structure traced by spectroscopic galaxies from the Sloan Digital Sky Survey Data Release 7. We characterize these alignments by means of an extension of the classical two-point cross-correlation function, developed by Paz et al. We find a strong alignment signal between the projected major axis of group shapes and the surrounding galaxy distribution up to scales of 30 Mpc h(-1). This observed anisotropy signal becomes larger as the galaxy group mass increases, in excellent agreement with the corresponding predicted alignment obtained from mock catalogues and Lambda CDM cosmological simulations. These measurements provide new direct evidence of the adequacy of the gravitational instability picture to describe the large-scale structure formation of our Universe.
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