AI 中文总结
研究利用JWST对高红移瞬变候选体beacon_1420 - 5253_4770进行分析，通过与光谱模板比较，判定其为红移 \(z\sim4.3\) 的Ia型超新星，为恒星形成与爆发延迟时间提供探测，还讨论了瞬变污染对早期宇宙星系搜索的影响。
AI 中文摘要
詹姆斯·韦布空间望远镜（JWST）通过发现早期宇宙中的星系和瞬变天体，为探索遥远宇宙打开了一扇新窗口。我们研究了一个高红移瞬变候选体beacon_1420 - 5253_4770。该天体最初被认定为红移 \(z\sim14\) 的高红移星系候选体。然而，在探测时刻前后的其他时期均未检测到该源，这表明它是一个瞬变源而非持续存在的星系。我们通过将其颜色、星等、光变曲线和光谱能量分布与各种瞬变光谱模板进行比较来对该源进行分类。我们的分析表明，观测到的性质与红移 \(z\sim4.3\) 处的 Ia 型超新星一致。Ia 型超新星光谱中可见的铁族元素的强吸收可以模拟用于探测高红移星系的莱曼限。在 \(z\sim4.3\)（对应宇宙年龄仅约15亿年）时，我们的探测为恒星形成与超新星爆发之间的延迟时间提供了直接探测。我们对事件率的估计意味着最短延迟时间短于10亿年。我们还讨论了瞬变污染对早期宇宙星系搜索的影响。
英文摘要
The James Webb Space Telescope (JWST) is opening a new window into the distant Universe by discovering galaxies and transients in the early Universe. We investigate a high-redshift transient candidate, beacon_1420-5253_4770. This object was initially identified as a high-redshift galaxy candidate at $z\sim14$. However, the source was not detected in epochs before and after the detection epoch, suggesting that the object is a transient source rather than a persistent galaxy. We classify the source by comparing the colors, magnitudes, light curves, and spectral energy distribution with various spectral templates of transients. Our analysis shows that the observed properties are consistent with a Type Ia supernova at $z\sim4.3$. Strong absorption by Fe-group elements seen in Type Ia supernova spectra can mimic the Lyman break used to detect high-redshift galaxies. At $z \sim 4.3$, corresponding to a cosmic age of only $\sim 1.5$ Gyr, our detection provides a direct probe of the delay time between star formation and supernova explosion. Our estimate of the event rate implies a minimum delay time shorter than 1 Gyr. We also discuss the implications of transient contamination for searches of galaxies in the early Universe.
Comments13 pages, 9 figures
