薄盘中的恒星形成历史、双简并和Ia型超新星
Star formation history, double degenerates and type Ia supernovae in the thin disc
摘要：
我们调查的恒星形成历史和双简并（DD）人口在薄盘的银河系，我们假设已经形成了10 Gyr在本之前的演化之间的关系。我们介绍了使用恒星形成的贡献函数作为一种设备来评估的出生率，总人数和合并率的DD。这些贡献函数有助于展示恒星形成历史和当前DD人口之间的关系，特别是，显示不同类型的DD的数量是如何敏感的恒星形成的不同时期。我们比较了不同恒星形成模型对DD的速率和数量以及Ia型超新星（SNIa）和核心坍缩超新星（ccSN）的影响。除了一个准指数下降模型，我们考虑了瞬时（或初始星爆）模型，一个恒定速率模型，和增强速率模型。所有这些都被标准化，以产生目前在当地薄盘中观察到的恒星密度。在所有四个模型中，DD和SNIa的速率和数量的演变都是不同的，但在瞬时恒星形成模型中最明显的不同，它产生了比过去其他三个模型高得多的速率，主要是由于归一化的结果。在四个模型中，对当前SNIa发生率的预测范围为~2至5 \times 10^{-4}年^{-1}，并且略低于观察到的发生率，因为我们只考虑了DD合并通道。预测的ccSN速率范围为1.5至3世纪^{-1}，与观测结果一致。
英文摘要：
We investigate the relation between the star formation history and the evolution of the double-degenerate (DD) population in the thin disc of the Galaxy, which we assume to have formed 10 Gyr before the present. We introduce the use of star-formation contribution functions as a device for evaluating the birth rates, total number and merger rates of DDs. These contribution functions help to demonstrate the relation between star-formation history and the current DD population and, in particular, show how the numbers of different types of DD are sensitive to different epochs of star formation. We have compared the impact of different star-formation models on the rates and numbers of DDs and on the rates of type Ia (SNIa) and core-collapse supernovae (ccSN). In addition to a quasi-exponential decline model, we considered an instantaneous (or initial starburst) model, a constant-rate model, and an enhanced-rate model. All were normalised to produce the present observed star density in the local thin disc. The evolution of the rates and numbers of both DDs and SNIa are different in all four models, but are most markedly different in the instantaneous star-formation model, which produces a much higher rate than the other three models in the past, primarily as a consequence of the normalisation. Predictions of the current SNIa rate range from ~2 to 5\times10^{-4} yr^{-1} in the four models, and are slightly below the observed rate because we only consider the DD merger channel. The predicted ccSN rate ranges from 1.5 to 3 century^{-1}, and is consistent with observations.
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