... A considerable number of blue irregular galaxies with ongoing star formation is present among nearby dwarf satellites of ... luminosity function for dwarf members of the group suggests that the total mass of the group is not very high, and that the X ...
... to stop the star formation in the nucleus, we may assume that during the second crossing several Gyr later, the intracluster orbit of the galaxy can be transformed into a slightly more elongated one, say, due to a chance encounter with a massive galaxy ...
... Kinematics of gas and stars in the centers of NGC 4429 and NGC ... If we have an axisymmetric mass distribution and rotation on ... kinematical ma jor axes of stars and gas, and a compact ...
... a small satellite whose mass is about 10% of the host mass should produce a nuclear ... star formation in the ring has already produced a substantial stellar population ...
... are essentially stellar (no sign of star formation) and old ... Estimating and comparing the mass of the two discs is strongly ... early-type galaxies is star formation in situ after infall of ...
... Since retrograde motions of stars are always present in the barred potential (Pfenniger 1984), and since stars drop gas during their evolution, in principle the inner polar gaseous disks may form in barred galaxies without outer donor contribution. ...
... The kinematics of the stars in the center of NGC 5574 are probably a#ected by the ... with both types of galaxies possessing homogeneously old, metalrich stars ... nature of a high mean metallicity and not of the homogeneously old age of the stars ...