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- W4290056082 abstract "$JWST$'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 $0.6-5mu$m photometry, this strikingly luminous ($approx$26 mag) galaxy appears to lie at $zapprox17$. This would make it an $M_{rm{UV}}approx-22$, $M_{rm{star}}approx5times10^{9}M_{rm{odot}}$ 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 $Lambda$CDM cosmology. However, there is strong environmental evidence supporting a secondary redshift solution of $zapprox5$: all three of the galaxy's nearest neighbors at $<2.5$ have photometric redshifts of $zapprox5$. Further, we show that CEERS-1749 may lie in a $zapprox5$ protocluster that is $gtrsim5times$ overdense compared to the field. Intense line emission at $zapprox5$ 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 $zapprox5$ conspire to boost the $>2mu$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 ($Delta zlesssim0.1$), 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 $zapprox5$, 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." @default.
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- W4290056082 date "2022-08-04" @default.
- W4290056082 modified "2023-10-10" @default.
- W4290056082 title "Schrodinger's Galaxy Candidate: Puzzlingly Luminous at $zapprox17$, or Dusty/Quenched at $zapprox5$?" @default.
- W4290056082 doi "https://doi.org/10.48550/arxiv.2208.02794" @default.
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