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Session 39 - Supernovae.
Display session, Thursday, January 08
Exhibit Hall,
We use a Monte Carlo technique, together with assumed spatial distributions of dust and supernova progenitors in a simple model galaxy, to study the extinction and radial distributions of supernovae. The model inclination--averaged extinction distributions for Type Ia and core collapse supernovae are presented. The projected radial distributions of supernovae are consistent with observational data. Even though our model has no core--collapse supernovae within the innermost 3 kpc, the projected radial distribution in inclined galaxies has core--collapse events near the center, owing to the small vertical scale height of the core--collapse events. Owing to the effects of extinction, the model predicts that supernovae projected near the center should on average appear dimmer and have a larger magnitude scatter than those in the outer regions. For core collapse supernovae, a strong deficit of bright events can be seen in the projected central regions. This is in agreement with data taken from the Asiago supernova catalogue. The fact that supernovae in the central regions tend to be observationally dim is not consistent with the standard interpretation of the Shaw effect; it is a natural consequence of the characteristic spatial distributions of dust and supernovae in galaxies.
