Deep ALMA redshift search of a z ~ 12 GLASS-JWST galaxy candidate
Deep ALMA redshift search of a z ~ 12 GLASS-JWST galaxy candidate
复制标题
z ~ 12 GLASS-JWST 候选星系的深度 ALMA 红移搜索
DOI：
10.1093/mnras/stac3723
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发表时间：
2022
影响因子：
4.8
通讯作者：
Nanayakkara Themiy
中科院分区：
文献类型：
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作者：
Bakx Tom J L C;Zavala Jorge A;Mitsuhashi Ikki;Treu Tommaso;Fontana Adriano;Tadaki Ken-ichi;Casey Caitlin M;Castellano Marco;Glazebrook Karl;Hagimoto Masato;Ikeda Ryota;Jones Tucker;Leethochawalit Nicha;Mason Charlotte;Morishita Takahiro;Nanayakkara Themiy
JWST在非常早期的宇宙中(大爆炸后的≤500 Myr)发现了令人惊讶的大量明亮的候选星系，对目前的星系形成模型提出了质疑。需要光谱学来确认这些候选星系的原始性质，以及了解第一批星系是如何形成恒星和成长的。在这里，我们介绍了对GHZ2/GRANSE-Z12的深光谱和连续谱ALMA观测，它是在GRASS-JWST早期释放科学计划中确定的Z>；10最亮和最健壮的候选者之一。我们检测到一条5.8σ线，从GHZ2/玻璃-z12的JWST位置偏移05，将其与[OIII]88跃迁相关联，意味着光谱红移为Z=12.117±0.001。我们使用广泛的统计检验来验证该检测。对于缺乏金属的星系，氧线光度将GHZ2/Glass-z12置于[Oiii]-SFR关系之上，这意味着该系统中[Oiii]发射的增强，而JWST观测到的发射可能是低金属丰度区。这些观测所看到的缺乏尘埃发射与JWST观测到的蓝色紫外线斜率是一致的，这表明在这个早期星系中尘埃的衰减很小。进一步的观测将毫不含糊地确认红移，并阐明这个早期星系的宽线和偏移线的起源以及物理性质。这项工作说明了JWST和ALMA之间的协同作用，并为未来对Z>；10星系候选星系的光谱调查铺平了道路。
TheJWSThas discovered a surprising abundance of bright galaxy candidates in the very early universe (≤500 Myr after the Big Bang), calling into question current galaxy formation models. Spectroscopy is needed to confirm the primeval nature of these candidates, as well as to understand how the first galaxies form stars and grow. Here we present deep spectroscopic and continuum ALMA observations towards GHZ2/GLASS-z12, one of the brightest and most robust candidates atz> 10, identified in the GLASS-JWSTEarly Release Science Program. We detect a 5.8σ line, offset 05 from theJWSTposition of GHZ2/GLASS-z12, that associating it with the [Oiii] 88transition, implies a spectroscopic redshift ofz= 12.117 ± 0.001. We verify the detection using extensive statistical tests. The oxygen line luminosity places GHZ2/GLASS-z12 above the [Oiii]-SFR relation for metal-poor galaxies, implying an enhancement of [Oiii] emission in this system while theJWST-observed emission is likely a lower-metallicity region. The lack of dust emission seen by these observations is consistent with the blue UV slope observed byJWST, which suggest little dust attenuation in galaxies at this early epoch. Further observations will unambiguously confirm the redshift and shed light on the origins of the wide and offset line and physical properties of this early galaxy. This work illustrates the synergy betweenJWSTand ALMA, and paves the way for future spectroscopic surveys ofz> 10 galaxy candidates.