1. Introduction

2. Sample selection and main properties  
2.1. Observations and physical parameters  
2.2. Morpho-dynamical modelling  
2.3. Environment characterization  
2.4. Sample selection  

3. Deriving the stellar angular momentum  
3.1. General derivation  
3.2. Estimating angular momentum from HST maps  
3.3. Application of the HST formalism to MAGIC  

4. Analysis  
4.1. Methodology  
4.2. Assessing the reliability of the method  

5. Results  
5.1. Environment traced by groups’ richness  
5.2. Link with global and local density estimates  
5.3. Motion-induced loss of angular momentum?  
5.4. An anti-correlation between gas dispersion and angular momentum  
5.5. Summary and interpretation of the results  

6. Conclusions