... In general, they lack a massive gaseous component and notice able starformation regions. ... may be related to a gas accretion event and a sub sequent starformation burst in the nucleus where the acc reted gas is ...
... processes gravitational tides, major and minor mergers (both dry and wet), external cold gas accretion through the intergalactic medium, ram pressure in the hot intracluster/intragroup medium govern starformation (SF) and reshape general structures ...
... stellar rotation in such a way that the gas counterrotates with respect to the stars ... the standard ones using the spectra of standard stars from the list by Worthey et al ...