http://arxiv.org/abs/1402.4137
The nature of the Type Ia supernovae (SNIa) progenitors remains still uncertain. This is a major issue for galaxy evolution models since both chemical and energetic feedbacks play a major role in the gas dynamics, the star formation and hence, in the overall stellar evolution. The progenitor models for the SNIa available in the literature propose different distributions for regulating the explosion times of these events. These functions are known as the Delay Time Distributions (DTDs). This work is the first one of a series of papers aiming at studying five different DTDs for SNIa. Here, we implement and analyse the Single Degenerate scenario (SD) and the behaviour of the parameter A which determines the fraction of binary systems in one stellar generation that give rise to SNIa events. It worth nothing that in SPH simulations, the parameter A acts at a particle basis which has no a priori knowledge of the type of galaxy it inhabits. We determine a value of A which reproduces the [{\alpha}/Fe] ratios and the present time observed SNIa rate for a pre-prepared galaxy in isolation. The calibrated SD scenario is found to generate naturally a correlation between the specific SNIa rate and the specific SFR (SSFR) which resembles closely the observational trends. Our results suggest that SNIa observations of very low and very high SSFR of galaxies could help to set more stringent constraints on the DTDs. In a forthcoming paper, we discuss the results of five different DTDs using the same numerical approach.
N. Jimenez, P. Tissera and F. Matteucci
Wed, 19 Feb 14
20/50
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