We investigate segregation phenomena in galaxy groups in the range of 0.2 < z < 1 .
We study a sample of groups selected from the 4th Data Release of the DEEP2 galaxy redshift survey .
We used only groups with at least 8 members within a radius of 4 Mpc .
Outliers were removed with the shifting gapper techinque and , then , the virial properties were estimated for each group .
The sample was divided into two stacked systems : low ( z \leq 0.6 ) and high ( z > 0.6 ) redshift groups .
Assuming that the color index { ( U - B ) _ { 0 } } can be used as a proxy for the galaxy type , we found that the fraction of blue ( star-forming ) objects is higher in the high- z sample , with blue objects being dominant at M _ { B } > -19.5 for both samples , and red objects being dominant at M _ { B } < -19.5 only for the low- z sample .
Also , the radial variation of the red fraction indicates that there are more red objects with R < R _ { 200 } in the low- z sample than in the high- z sample .
Our analysis indicates statistical evidence of kinematic segregation , at the 99 % c.l. , for the low- z sample : redder and brighter galaxies present lower velocity dispersions than bluer and fainter ones .
We also find a weaker evidence for spatial segregation between red and blue objects , at the 70 % c.l .
The analysis of the high- z sample reveals a different result : red and blue galaxies have velocity dispersion distributions not statistically distinct , although redder objects are more concentrated than the bluer ones at the 95 % c.l .
From the comparison of blue/red and bright/faint fractions , and considering the approximate lookback timescale between the two samples ( \sim 3 Gyr ) , our results are consistent with a scenario where bright red galaxies had time to reach energy equipartition , while faint blue/red galaxies in the outskirts infall to the inner parts of the groups , thus reducing spatial segregation from z \sim 0.8 to z \sim 0.4 .