论文标题
红移6.2的高度放大恒星
A Highly Magnified Star at Redshift 6.2
论文作者
论文摘要
Galaxy簇通过强烈的重力镜头放大背景对象。镜头星系的典型宏伟性是少数因素，但也可能高达数十或数百个因素，将星系扩展到巨大的弧线中。鉴于与镜头簇的偶然比分，个别恒星可以达到更高的宏伟速度。最近，已经发现了红移$ z \ sim 1-1.5 $的几个单独的恒星，被数千个因素放大，暂时通过微透镜增强。在这里，我们报告了一个更遥远和持久放大的星星的观察结果，在大爆炸后，红移$ z _ {\ rm phot} = 6.2 \ pm 0.1 $，900 Myr。前景星系簇镜头WHL0137--08（$ z = 0.566 $）被前景星系群镜头镜头镜头镜头大量数千所放大，如四个独立镜头型号所估计。与以前的镜头恒星不同，放大倍率和观察到的亮度（AB MAG 27.2）在3。5年的成像和随访中保持了大约恒定的恒定。删除的绝对UV幅度$ m_ {uv} = -10 \ pm 2 $与质量$ m> 50 m _ {\ odot} $的星星一致。通过詹姆斯·韦伯太空望远镜的批准观察，确认和光谱分类即将进行
Galaxy clusters magnify background objects through strong gravitational lensing. Typical magnifications for lensed galaxies are factors of a few but can also be as high as tens or hundreds, stretching galaxies into giant arcs. Individual stars can attain even higher magnifications given fortuitous alignment with the lensing cluster. Recently, several individual stars at redshift $z \sim 1 - 1.5$ have been discovered, magnified by factors of thousands, temporarily boosted by microlensing. Here we report observations of a more distant and persistent magnified star at redshift $z_{\rm phot} = 6.2 \pm 0.1$, 900 Myr after the Big Bang. This star is magnified by a factor of thousands by the foreground galaxy cluster lens WHL0137--08 ($z = 0.566$), as estimated by four independent lens models. Unlike previous lensed stars, the magnification and observed brightness (AB mag 27.2) have remained roughly constant over 3.5 years of imaging and follow-up. The delensed absolute UV magnitude $M_{UV} = -10 \pm 2$ is consistent with a star of mass $M > 50 M_{\odot}$. Confirmation and spectral classification are forthcoming from approved observations with the James Webb Space Telescope
