Journal
ASTROPHYSICAL JOURNAL
Volume 718, Issue 2, Pages 762-767Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/718/2/762
Keywords
dark matter; galaxies: halos; galaxies: structure; large-scale structure of universe; methods: statistical
Categories
Funding
- National Astronomical Observatories
- NSFC [10525314]
- Ministry of Science and Technology [2007CB815401, 2010CB833004]
- CAS [KJCX3-SYW-N2]
- Ministry of Education, Science & Technology (MoST), Republic of Korea [PG016902] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We use galaxy groups at redshifts between 0.4 and 1.0 selected from the Great Observatories Origins Deep Survey to study the color-morphological properties of satellite galaxies and investigate possible alignment between the distribution of the satellites and the orientation of their central galaxy. We confirm the bimodal color and morphological-type distribution for satellite galaxies at this redshift range: the red and blue classes correspond to the early and late morphological types, respectively, and the early-type satellites are on average brighter than the late-type ones. Furthermore, there is a morphological conformity between the central and satellite galaxies: the fraction of early-type satellites in groups with an early-type central is higher than those with a late-type central galaxy. This effect is stronger at smaller separations from the central galaxy. We find a marginally significant signal of alignment between the major axis of the early-type central galaxy and its satellite system, while for the late-type centrals no significant alignment signal is found. We discuss the alignment signal in the context of shape evolution of groups.
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