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Abstract: We use galaxy groups at redshifts between 0.4 and 1.0 selected from the GreatObservatories Origins Deep Survey GOODS to study the color-morphologicalproperties of satellite galaxies, and investigate possible alignment betweenthe distribution of the satellites and the orientation of their central galaxy.We confirm the bimodal color and morphological type distribution for satellitegalaxies at this redshift range: the red and blue classes corresponds to theearly and late morphological types respectively, and the early-type satellitesare on average brighter than the late-type ones. Furthermore, there is a {\itmorphological conformity} between the central and satellite galaxies: thefraction of early-type satellites in groups with an early-type central ishigher than those with a late-type central galaxy. This effect is stronger atsmaller separations from the central galaxy. We find a marginally significantsignal of alignment between the major axis of the early-type central galaxy andits satellite system, while for the late-type centrals no significant alignmentsignal is found. We discuss the alignment signal in the context of shapeevolution of groups.



Autor: Yougang Wang, Changbom Park, Ho Seong Hwang, Xuelei Chen

Fuente: https://arxiv.org/







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