Galactic constraints on supernova progenitor models
Galactic constraints on supernova progenitor models
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DOI：
10.1051/0004-6361/201220944
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发表时间：
2013-07
影响因子：
6.5
通讯作者：
I. Acharova;B. Gibson;Y. Mishurov;V. Kovtyukh
中科院分区：
文献类型：
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作者：
I. Acharova;B. Gibson;Y. Mishurov;V. Kovtyukh
目标。通过观测银河系盘中的元素丰度模式，估计每种类型的超新星（SNe）事件喷出的氧和铁的平均质量，并约束相关的SNe祖先模型。方法.我们进行了统计分析的径向丰度分布在银河系的化学演化，其中包括螺旋臂的影响的理论框架内的银河系盘。这个框架已被证明可以恢复径向梯度的非线性行为，估计SNe爆炸过程中喷出的氧气和铁的平均质量，以及对SNe祖先模型的约束。结果(i)每次核心坍缩SNe事件喷出的平均氧气质量（CC SNe）（这是集中在螺旋臂）是10.27 M;（ii）平均质量的铁喷射缓慢Ia型超新星（SNeIa，其祖先是年龄为1亿年和几个Gyr的较老/寿命较长的恒星，它们不集中在旋臂内）是10.58 M ²;（iii）由SNeIa（SNe，其祖先是年龄为1亿年的较年轻/寿命较短的恒星，集中在螺旋状恒星中）喷出的铁的上层质量。
Aims. To estimate the mean masses of oxygen and iron ejected per each type of supernovae (SNe) event from observations of the elemental abundance patterns in the Galactic disk and constrain the relevant SNe progenitor models. Methods. We undertake a statistical analysis of the radial abundance distributions in the Galactic disk within a theoretical framework for Galactic chemical evolution which incorporates the influence of spiral arms. This framework has been shown to recover the non-linear behaviour in radial gradients, the mean masses of oxygen and iron ejected during SNe explosions to be estimated, and constraints to be placed on SNe progenitor models. Results. (i) The mean mass of oxygen ejected per core-collapse SNe (CC SNe) event (which are concentrated within spiral arms) is ∼0.27 M� ; (ii) the mean mass of iron ejected by tardy Type Ia SNe (SNeIa, whose progenitors are older/longer-lived stars with ages 100 Myr and up to several Gyr, which do not concentrate within spiral arms) is ∼0.58 M� ; (iii) the upper mass of iron ejected by prompt SNeIa (SNe whose progenitors are younger/shorter-lived stars with ages 100 Myr, which are concentrated within spiral ˙ �