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Paper: Star Formation in Galaxies vs Galaxy Environment from the Joint GALEX - CFHTLS - VVDS - SWIRE Data
Volume: 380, At the Edge of the Universe: Latest Results from the Deepest Astronomical Surveys
Page: 537
Authors: Pollo, A.; Arnouts, S.; Heinis, S.; Milliard, B.; the GALEX team; the VVDS team
Abstract: We investigate the dependence of galaxy star-formation history on environment, using colors - in particular UV colors - as star-formation history indicators and the distance to the 3-rd projected neighbor as an environment indicator. Here we present the first attempt to analyze how this dependence changed with redshift from z ~ 1 till the present epoch. To address this issue we use a multi-wavelength catalog, based on the joint GALEX, CFHLTLS, VVDS and SWIRE data. The photometric redshifts derived from this catalog, covering an area close to ~ 1.0 square degree and containing more than 100000 galaxies, are accurate enough for these studies and possibly allow for a homogeneous approach from the local Universe to z ~ 1. We find that in the contemporary Universe the most luminous and reddest in UV (i.e. most recently star-forming) populate the densest regions, which is in agreement with other studies. At z closer to 1 this tendency seems to disappear. However, systematic effects, not easy to quantify, have to be taken into account when interpreting our results.
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