Supernova search at intermediate z. III. Expansion velocities of the ejecta

Abstract

We discuss the expansion velocities of different elements in the ejecta of the intermediate-z SNe Ia discovered as a part of the International Time Programme (ITP) project ``Omega and Lambda from Supernovae and the Physics of Supernova Explosions'' at the European Northern Observatory (ENO). The expansion velocities measured for each normal SNIa are found to be within the typical velocity dispersion for their epoch. Meanwhile, the subluminous SN 2002lk SiII expansion velocity is significantly higher than that of SN 1991bg shortly after maximum. The observed phase was younger in SN2002lk than in the local subluminous SNIa SN1991bg.Comment: 2 pages, 1 figure, 1 table, to appear in ``1604-2004: Supernovae as Cosmological Lighthouses'', (extended text upon request