论文标题

要看或不看到$ z \ sim13 $ galaxy,这就是问题

To see or not to see a $z\sim13$ galaxy, that is the question

论文作者

Kaasinen, Melanie, van Marrewijk, Joshiwa, Popping, Gergö, Ginolfi, Michele, Di Mascolo, Luca, Mroczkowski, Tony, Concas, Alice, Di Cesare, Claudia, Killi, Meghana, Langan, Ivanna

论文摘要

确定第一个星系何时形成仍然是现代观察天文学的杰出目标。理论和当前的恒星种群模型表明,第一个星系至少在$ z = 14-15 $中形成。但是迄今为止,在$ z> 13 $(GS-Z13-0)上只有一个星系已通过光谱确认。.Galaxy“ HD1”最近被认为是基于其潜在的Lyman Break和intentative [O III]88μm检测Alma的Z = 13.27 Galaxy。我们在此旨在通过新的ALMA频段4测试这种情况,如果HD1为z $ \ sim $ 13.27,则ddt观察到[C II]158μm排放。我们仔细分析了新的ALMA频段4观测值,并重新分析了源的现有Alma频段6数据以确定拟议的红移。我们在频段4数据中发现了一个暂定性的$4σ$功能,该数据在空间上被1.7“ 1.7”,并且从先前报告的3.8σ$`[O III]88μm'功能中偏移了190 km s-1。通过各种统计测试,我们证明了这些暂定功能与两种噪音相比,我们都可以恢复过来。 ii] $ z \ sim 13.27 $。现在可能需要JWST/NIRSPEC光谱。

Determining when the first galaxies formed remains an outstanding goal of modern observational astronomy. Theory and current stellar population models imply that the first galaxies formed at least at $z = 14-15$. But to date, only one galaxy at $z > 13$ (GS-z13-0) has been spectroscopically confirmed.. The galaxy `HD1' was recently proposed to be a z=13.27 galaxy based on its potential Lyman break and tentative [O III] 88 μm detection with ALMA. We hereby aim to test this scenario with new ALMA Band 4, DDT observations of what would be the [C II] 158 μm emission, if HD1 is at z$\sim$13.27. We carefully analyse the new ALMA Band 4 observations and re-analyse the existing ALMA Band 6 data on the source to determine the proposed redshift. We find a tentative $4σ$ feature in the Band 4 data that is spatially offset by 1.7" and spectrally offset by 190 km s-1 from the previously-reported $3.8σ$ `[O III] 88 μm' feature. Through various statistical tests, we demonstrate that these tentative features are fully consistent with both being random noise features. We conclude that we are more likely to be recovering noise features than both [O III] and [C II] emission from a source at $z\sim 13.27$. Although we find no credible evidence of a $z\sim 13.27$ galaxy, we cannot entirely rule out this scenario. Non-detections are also possible for a $z\sim 13$ source with a low interstellar gas-phase metallicity or ionisation parameter and/or high gas density. Determining where and exactly what type of galaxy HD1 is, will now likely require JWST/NIRSpec spectroscopy.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源