论文标题
玻璃-JWST VIII的早期结果：Abell 2744群集场的Redshift 2.65的极其放大的蓝色超级巨星
Early results from GLASS-JWST VIII: An Extremely Magnified Blue Supergiant Star at Redshift 2.65 in the Abell 2744 Cluster Field
论文作者
论文摘要
我们报告了Redshift $ Z = 2.65美元在James Webb Space望远镜（JWST）NIRISS的Abell 2744 Galaxy-Clast-Cluster Field Imimage的发现，在RedShift $ Z = 2.65 $中发现了一个极其放大的恒星。恒星的背景主机银河系位于前景镜头的折叠量中，群集创建了靠近镜头恒星的区域的一对图像。 We identified the bright transient in one of the merging images at a distance of $\sim 0.15"$ from the critical curve, by subtracting the JWST F115W and F150W imaging from coadditions of archival Hubble Space Telescope (HST) F105W and F125W images and F140W and F160W images, respectively. Since the time delay between the two images should be only hours, the transient must是单个恒星的微透镜事件，而不是持续数天的发光恒星爆炸，这是对个体暴露的分析。 K.
We report the discovery of an extremely magnified star at redshift $z=2.65$ in James Webb Space Telescope (JWST) NIRISS pre-imaging of the Abell 2744 galaxy-cluster field. The star's background host galaxy lies on a fold caustic of the foreground lens, and the cluster creates a pair of images of the region close to the lensed star. We identified the bright transient in one of the merging images at a distance of $\sim 0.15"$ from the critical curve, by subtracting the JWST F115W and F150W imaging from coadditions of archival Hubble Space Telescope (HST) F105W and F125W images and F140W and F160W images, respectively. Since the time delay between the two images should be only hours, the transient must be the microlensing event of an individual star, as opposed to a luminous stellar explosion which would persist for days to months. Analysis of individual exposures suggests that the star's magnification is not changing rapidly during the observations. From photometry of the point source through the F115W, F150W, and F200W filters, we identify a strong Balmer break, and modeling allows us to constrain the star's temperature to be approximately 7,000--12,000 K.
