论文标题
Schrodinger的Galaxy候选人：令人困惑的发光为$ z \ of17 $，还是以$ z \ of 5 $？
Schrodinger's Galaxy Candidate: Puzzlingly Luminous at $z\approx17$, or Dusty/Quenched at $z\approx5$?
论文作者
论文摘要
$ JWST $的第一个浏览$ Z> 10 $宇宙产生了令人惊讶的发光星系候选者。在这里，我们介绍了这些系统中最极端的：Ceers-1749。基于$0.6-5μm的光度法，这个惊人的发光（$ \ $ 26 mag）的银河系似乎位于$ z \ of17 $。 This would make it an $M_{\rm{UV}}\approx-22$, $M_{\rm{\star}}\approx5\times10^{9}M_{\rm{\odot}}$ system that formed a mere $\sim220$ Myrs after the Big Bang.该银河系的隐含数量密度及其类似物几乎挑战了假设$ CDM宇宙学的每个早期星系演化模型。 However, there is strong environmental evidence supporting a secondary redshift solution of $z\approx5$: all three of the galaxy's nearest neighbors at $<2.5$" have photometric redshifts of $z\approx5$. Further, we show that CEERS-1749 may lie in a $z\approx5$ protocluster that is $\gtrsim5\times$ overdense compared to the field. Intense line emission at $ z \ theragy的纪念性星系中有离子气或尘土飞扬的大约5 $，可以为Ceers 1749的光度计提供令人满意的解释。 （$ΔZ\ LISHSIM0.1 $）暗示，这种误解者的允许数量可能不是$ z> 10 $的主要问题，尤其是当中等频段时，如果确认Ceers-1749是在$ z \ abe时这个有趣的银河系的红移解决方案具有挑战现有的早期星系进化模型的潜力，从而使该来源的光谱随访至关重要。
$JWST$'s first glimpse of the $z>10$ Universe has yielded a surprising abundance of luminous galaxy candidates. Here we present the most extreme of these systems: CEERS-1749. Based on $0.6-5μ$m photometry, this strikingly luminous ($\approx$26 mag) galaxy appears to lie at $z\approx17$. This would make it an $M_{\rm{UV}}\approx-22$, $M_{\rm{\star}}\approx5\times10^{9}M_{\rm{\odot}}$ system that formed a mere $\sim220$ Myrs after the Big Bang. The implied number density of this galaxy and its analogues challenges virtually every early galaxy evolution model that assumes $Λ$CDM cosmology. However, there is strong environmental evidence supporting a secondary redshift solution of $z\approx5$: all three of the galaxy's nearest neighbors at $<2.5$" have photometric redshifts of $z\approx5$. Further, we show that CEERS-1749 may lie in a $z\approx5$ protocluster that is $\gtrsim5\times$ overdense compared to the field. Intense line emission at $z\approx5$ from a quiescent galaxy harboring ionized gas, or from a dusty starburst, may provide satisfactory explanations for CEERS-1749's photometry. The emission lines at $z\approx5$ conspire to boost the $>2μ$m photometry, producing an apparent blue slope as well as a strong break in the SED. Such a perfectly disguised contaminant is possible only in a narrow redshift window ($Δz\lesssim0.1$), implying that the permitted volume for such interlopers may not be a major concern for $z>10$ searches, particularly when medium-bands are deployed. If CEERS-1749 is confirmed to lie at $z\approx5$, it will be the highest-redshift quiescent galaxy, or one of the lowest mass dusty galaxies of the early Universe detected to-date. Both redshift solutions of this intriguing galaxy hold the potential to challenge existing models of early galaxy evolution, making spectroscopic follow-up of this source critical.
