ALMA observations of super-early galaxies: attenuation-free model predictions

A. Ferrara; S. Carniani; F. di Mascia; R. Bouwens; P. Oesch; S. Schouws

doi:10.1051/0004-6361/202452368

paper

ALMA observations of super-early galaxies: attenuation-free model predictions

arXiv:2409.17223 · doi:10.1051/0004-6361/202452368

Abstract

The abundance and blue color of super-early (redshift $z > 10$ ), luminous galaxies discovered by JWST can be explained if radiation-driven outflows have ejected their dust on kpc-scales. To test this hypothesis, we predict the ALMA detectability of such extended dust component. Given the observed properties of the galaxy, its observed continuum flux at 88 $μ$ m, $F_{88}$ , depends on the dust-to-stellar mass ratio, $ξ_{d}$ , and extent of the dust distribution, $r_{d}$ . Once applied to the most distant galaxy known, GS-z14-0 at $z = 14.32$ , the fiducial model ( $ξ_{d} = 1/529$ ) predicts $F_{88}^{fid} = 14.9 μ$ Jy, and a dust extent $r_{d} = 1.4$ kpc. If the galaxy is very dust-rich ( $ξ_{d} = 1/40$ ), $F_{88}^{max} = 40.1 μ$ Jy. These values are smaller ( $F_{88}^{fid} = 9.5 μ$ Jy) if the dust is predominantly made of large grains as those formed in SN ejecta. Forthcoming ALMA observations might come very close to constraining the fiducial predictions of the outflow-based attenuation-free model. Other super-early galaxies are predicted to be fainter at 88 $μ$ m, mostly because of their lower SFR compared to GS-z14-0, with fiducial fluxes in the range $2 - 5.2 μ$ Jy.

arXiv comment9 pages, 2 figures, submitted to A&A, comments welcome

ALMA observations of super-early galaxies: attenuation-free model predictions

Abstract

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