ALMA observations of super-early galaxies: attenuation-free model predictions
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866915158786310144 |
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| author | Ferrara, A. Carniani, S. di Mascia, F. Bouwens, R. Oesch, P. Schouws, S. |
| author_facet | Ferrara, A. Carniani, S. di Mascia, F. Bouwens, R. Oesch, P. Schouws, S. |
| contents | 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 $F_{88}^{\rm fid} = 14.9\, μ$Jy, and a dust extent $r_d=1.4$ kpc. If the galaxy is very dust-rich ($ξ_d =1/40$), $F_{88}^{\rm max} = 40.1\, μ$Jy. These values are smaller ($F_{88}^{\rm fid} = 9.5\, μ$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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2409_17223 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | ALMA observations of super-early galaxies: attenuation-free model predictions Ferrara, A. Carniani, S. di Mascia, F. Bouwens, R. Oesch, P. Schouws, S. Astrophysics of Galaxies 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 $F_{88}^{\rm fid} = 14.9\, μ$Jy, and a dust extent $r_d=1.4$ kpc. If the galaxy is very dust-rich ($ξ_d =1/40$), $F_{88}^{\rm max} = 40.1\, μ$Jy. These values are smaller ($F_{88}^{\rm fid} = 9.5\, μ$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. |
| title | ALMA observations of super-early galaxies: attenuation-free model predictions |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2409.17223 |