ar X iv : a st ro - p h / 97 11 20 1 v 1 1 8 N ov 1 99 7 Type Ia Supernovae : An Examination of Potential Progenitors and the Redshift Distribution

ar X iv : a st ro - p h / 97 11 24 4 v 1 2 0 N ov 1 99 7 POPULATION SYNTHESIS OF HIGH ENERGY TRANSIENTS RELATIVISTIC BINARY MERGING RATES

ar X iv : a st ro - p h / 97 11 13 5 v 1 1 2 N ov 1 99 7 HOT ELECTRONS AND COLD PHOTONS : GALAXY CLUSTERS AND THE SUNYAEV - ZEL ’ DOVICH EFFECT

ar X iv : a st ro - p h / 98 11 01 5 v 1 2 N ov 1 99 8 The large – scale distribution of galaxies in the Shapley Concentration

We present the results of a galaxy redshift survey in the central region of the Shapley Concentration. Our total sample contains ∼ 2000 radial velocities of galaxies both in the clusters and in the inter-cluster field. We reconstruct the density profile of this supercluster, calculate its overdensity and total mass. Moreover we detect a massive structure behind the Shapley Concentration, at ∼ 3...

ar X iv : a st ro - p h / 97 11 18 2 v 1 1 7 N ov 1 99 7 Warps and Secondary

Secondary infall in galaxies could cause the angular momentum of the outer halo to change its orientation. The generation of warps due to this effect is studied using N-body simulations.

ar X iv : a st ro - p h / 99 03 26 4 v 1 1 7 M ar 1 99 9 The Progenitors of Type

Models for Type Ia Supernovae (SNe Ia) are reviewed. It is shown that there are strong reasons to believe that SNe Ia represent thermonuclear disruptions of C–O white dwarfs, when these white dwarfs reach the Chandrasekhar limit and ignite carbon at their centers. Progenitor scenarios are reviewed critically and the strengths and weaknesses of each scenario are explicitly presented. It is argue...