From Galactic chemical evolution to cosmic supernova rates synchronized with core-collapse supernovae limited to the narrow progenitor mass range
From Galactic chemical evolution to cosmic supernova rates synchronized with core-collapse supernovae limited to the narrow progenitor mass range
复制标题
从银河化学演化到与核心塌缩超新星同步的宇宙超新星速率，仅限于狭窄的前体质量范围
DOI：
10.1093/mnras/stac3351
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发表时间：
2022
影响因子：
4.8
通讯作者：
Tsujimoto T
中科院分区：
文献类型：
--
作者：
Yokoyama Tetsuya;Nagashima Kazuhide;Nakai Izumi;Young Edward D.;Abe Yoshinari;Aleon Jerome;Alexander Conel M. O’D.;Amari Sachiko;Amelin Yuri;Bajo Ken-ichi ... Yabuta Hikaru ... et al.;Tsujimoto T
大质量（≥8 M⊙）恒星会因两种命运之一而灭亡：核心塌缩超新星（CCSNe），释放合成的重元素，或失败的超新星，从而形成黑洞。在传统的银河化学演化（GCE）方案中，很大一部分大质量恒星，例如质量范围为 8–100 M⊙ 的所有恒星都被认为会通过其核合成产物丰富银河系。然而，这一假设与观测结果相矛盾，即很少有 CCSNe 的前身星质量超过 ∼18 M⊙。在这里，我们表明，局部薄盘恒星形成的化学特征与通过CCSNe富集的预测相一致，该富集仅限于银河动力学新范式中较小质量的祖细胞，该范式允许恒星从内盘迁移。这个更新的 GCE 模型预测，爆发的恒星形成事件（被认为发生在银河核球和厚盘中）产生的低质量 CCSNe 数量比本地确定的规范初始质量函数预期的数量要多。这一发现表明早期型星系中的CCSNe比率很高，这反映了CCSN率的独特宇宙历史。由于这些星系对早期宇宙中的宇宙恒星形成率做出了相当大的贡献，我们预测CCSN率随着红移的增加而增加的斜率比与宇宙恒星形成的比例的斜率更陡峭。这种预测的红移演化与测量的速率非常吻合；然而，其预测的 CCSN 率较高，需要从未来的调查中获得更精确的数据。
Massive (≥8 M⊙) stars perish via one of two fates: core-collapse supernovae (CCSNe), which release synthesized heavy elements, or failed supernovae, thereby forming black holes. In the conventional Galactic chemical evolution (GCE) scheme, a substantial portion of massive stars, e.g. all stars in the mass range of 8–100 M⊙, are assumed to enrich the Galaxy with their nucleosynthetic products. However, this hypothesis conflicts with the observations, namely, few CCSNe whose progenitor stars are more massive than ∼18 M⊙. Here, we show that the chemical characteristics shaped by local thin disc stars are compatible with the predictions by enrichment via CCSNe limited to less massive progenitors in the new paradigm of Galactic dynamics that allows stars to migrate from the inner disc. This renewed GCE model predicts that the bursting star formation events − which are considered to take place in the Galactic bulge and in the thick disc − generate more numerous low-mass CCSNe than those expected from the locally determined canonical initial mass function. This finding suggests a high rate of CCSNe in early-type galaxies, which reflects a unique cosmic history of the CCSN rate. With considerable contributions from these galaxies to the cosmic star formation rates in the early Universe, we predict a more steeply increasing slope of the CCSN rate with increasing redshift than that in proportion to cosmic star formation. This predicted redshift evolution agrees well with the measured rates for; however, its predicted CCSN rate for higherzcalls for more precise data from future surveys.