http://arxiv.org/abs/2209.06840
The recent JWST discovery of a population of super-early (redshift $z> 10$), relatively massive (stellar mass $M_* = 10^{8-9} M_{\odot}$) and evolved (metallicity $Z \approx 0.1 Z_{\odot}$) galaxies, which nevertheless show blue ($\beta \simeq -2.6$) spectra, and very small dust attenuation ($A_{\rm V} \leq 0.02$), challenges our interpretation of these systems. To solve the puzzle we propose two solutions in which dust is either (a) ejected by radiation pressure, or (b) segregated with respect to UV-emitting regions. We clarify the conditions for which the two scenarios apply, and show that they can be discriminated by ALMA observations, such as the recent non-detection of the $88\mu m$ dust continuum in GHZ2 ($z\simeq 12$) favouring dust ejection.
F. Ziparo, A. Ferrara, L. Sommovigo, et. al.
Fri, 16 Sep 22
67/84
Comments: 8 pages, 4 figures. Analysis of early release JWST data. Submitted to MNRAS. Comments welcome
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