Revealing Galaxy Candidates out to $z sim 16$ with JWST Observations of the Lensing Cluster SMACS0723
Revealing Galaxy Candidates out to $z sim 16$ with JWST Observations of the Lensing Cluster SMACS0723
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通过 JWST 对透镜簇的观测，揭示了 $z sim 16$ 的候选星系 SMACS0723
DOI：
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Iryna Chemerynska
中科院分区：
文献类型：
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作者：
H. Atek;M. Shuntov;L. Furtak;J. Richard;J. Kneib;G. Mahler;A. Zitrin;H. McCracken;S. Charlot;J. Chevallard;Iryna Chemerynska
JWST的主要目标之一是研究宇宙中的第一批星系。我们提出了一个系统的光度分析非常遥远的星系在第一个JWST深场对大质量透镜星团SMACS0723。因此，我们报告在？~ 16年，也就是大爆炸后的2.5亿年。我们还确定了两个候选人在？~ 12名和11名候选人？~ 10−11。我们的搜索范围延伸到了？（cid:46） 21通过结合七个NIRCam和NIRISS滤镜的颜色信息。通过使用EAZY和BEAGLE对光谱能量分布（SEDs）进行建模，我们测试了光度红移估计的鲁棒性。而它们的固有（非透镜）光度是典型的特征光度L * at ？bbbb10，我们的高红移星系通常显示出较小的尺寸，它们的形态在某些情况下与圆盘一致。红移最高的候选物具有极蓝的uv连续斜率- 3 < ？<−2。5，年轻年龄~ 10−100 Myr，恒星质量log (？★/ M (cid:12)) = 8。4−8。从他们的SED模型推断，这表明它们的恒星质量迅速增加。我们的研究清楚地证明了JWST有能力发现高红移的可靠的光度候选者，并观察到第一个星系的形成时期。
One of the main goals of the JWST is to study the first galaxies in the Universe. We present a systematic photometric analysis of very distant galaxies in the first JWST deep field towards the massive lensing cluster SMACS0723. As a result, we report the discovery of two galaxy candidates at ? ∼ 16, only 250 million years after the Big Bang. We also identify two candidates at ? ∼ 12 and 11 candidates at ? ∼ 10 − 11. Our search extended out to ? (cid:46) 21 by combining color information across seven NIRCam and NIRISS filters. By modelling the Spectral Energy Distributions (SEDs) with EAZY and BEAGLE , we test the robustness of the photometric redshift estimates. While their intrinsic (un-lensed) luminosity is typical of the characteristic luminosity L ∗ at ? > 10, our high-redshift galaxies typically show small sizes and their morphologies are consistent with disks in some cases. The highest-redshift candidates have extremely blue UV-continuum slopes − 3 < ? < − 2 . 5, young ages ∼ 10 − 100 Myr, and stellar masses log ( ? ★ / M (cid:12) ) = 8 . 4 − 8 . 8 inferred from their SED modeling which indicate a rapid build-up of their stellar mass. Our search clearly demonstrates the capabilities of JWST to uncover robust photometric candidates up to very high redshifts, and peer into the formation epoch of the first galaxies.