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THE TYPE Ia SUPERNOVA RATE

机译:Ia型超新星率

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We explore the idea that the Type Ia supernova (SN Ia) rate consists of two components: a prompt piece that is proportional to the star formation rate (SFR), and an extended piece that is proportional to the total stellar mass. We fit the parameters of this model to the local observations by Mannucci and collaborators and then study its impact on three important problems. On cosmic scales, the model reproduces the observed SN Ia rate density below z = 1 and predicts that it will track the measured SFR density at higher redshift, reaching a value of (1-3.5) x 10~(-4) yr~(-4) Mpc~(-3) at z = 2. In galaxy clusters, a large prompt contribution helps explain the Fe content of the intracluster medium. Within the Galaxy, the model reproduces the observed stellar [O/Fe] abundance ratios if we allow a short ( ≈ 0.7 Gyr) delay in the prompt component. Ongoing medium-z SN surveys will yield more accurate parameters for our model.
机译:我们探讨了Ia型超新星(SN Ia)速率由两个部分组成的想法:一个与恒星形成率(SFR)成比例的瞬发碎片,以及一个与总恒星质量成比例的延伸件。我们将此模型的参数与Mannucci及其合作者的本地观测值进行拟合,然后研究其对三个重要问题的影响。在宇宙尺度上,该模型重现了观测到的SN Ia速率密度低于z = 1并预测它将在更高的红移下跟踪测得的SFR密度,达到(1-3.5)x 10〜(-4)yr〜( -4)在z = 2时的Mpc〜(-3)。在星系团中,大量的即时贡献有助于解释集群内介质中的铁含量。在银河系中,如果我们在提示分量中允许短暂的延迟(≈0.7 Gyr),则该模型将再现观察到的恒星[O / Fe]丰度比。正在进行的中z SN调查将为我们的模型提供更准确的参数。

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