ar X iv : a st ro - p h / 97 11 32 8 v 1 2 7 N ov 1 99 7 A Statistical Treatment of the Gamma - Ray Burst “ No Host Object ” Issue

ar X iv : a st ro - p h / 97 11 35 4 v 1 2 8 N ov 1 99 7 Theoretical Models of Gamma - Ray Bursts 1

Models of gamma ray bursts are reviewed in the light of recent observations of afterglows which point towards a cosmological origin. The physics of fireball shock models is discussed, with attention to the type of light histories and spectra during the gamma-ray phase. The evolution of the remnants and their afterglows is considered, as well as their implications for our current understanding o...

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 / 97 11 07 0 v 1 7 N ov 1 99 7 Pulsar Counterparts of Gamma - Ray Sources

The EGRET catalogue of unidentified X-ray sources has more objects along the galactic disk than at high galactic latitude, where identifications are comparatively easier. On the other hand, the Egret/GRO mission has already identified several known radio pulsars as gamma-ray sources as well as discovering Geminga's nature as a pulsar. If Geminga is not a unique case, as it is very likely not to...

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.