Blue Monsters at $z>10$. Where has all their dust gone?
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866929557951479808 |
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| author | Ferrara, A. Pallottini, A. Sommovigo, L. |
| author_facet | Ferrara, A. Pallottini, A. Sommovigo, L. |
| contents | The properties of luminous, blue (a.k.a. Blue Monsters), super-early galaxies at redshift $z>10$ have been successfully explained by the attenuation-free model (AFM) in which dust is pushed to kpc-scales by radiation-driven outflows. As an alternative to AFM, here we assess whether *attenuation-free* conditions can be replaced by a *dust-free* scenario in which dust is produced in very limited amounts and/or later destroyed in the interstellar medium. To this aim we compare the predicted values of the dust-to-stellar mass ratio, $ξ_d$, with those measured in 15 galaxies at $z>10$ from JWST spectra, when outflows are not included. Our model constrains $ξ_d$ as a function of several parameters by allowing wide variations in the IMF, dust/metal production, and dust destruction for a set of SN progenitor models and explosion energies. We find $\log ξ_d \approx -2.2$ for all systems, indicative of the dominant role of SN dust production over destruction in these early galaxies. Such value is strikingly different from the data, which instead indicate $\log ξ_d < -4$. We conclude that dust destruction alone can hardly explain the transparency of Blue Monsters. Other mechanisms, such as outflows, might be required. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_19042 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Blue Monsters at $z>10$. Where has all their dust gone? Ferrara, A. Pallottini, A. Sommovigo, L. Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics The properties of luminous, blue (a.k.a. Blue Monsters), super-early galaxies at redshift $z>10$ have been successfully explained by the attenuation-free model (AFM) in which dust is pushed to kpc-scales by radiation-driven outflows. As an alternative to AFM, here we assess whether *attenuation-free* conditions can be replaced by a *dust-free* scenario in which dust is produced in very limited amounts and/or later destroyed in the interstellar medium. To this aim we compare the predicted values of the dust-to-stellar mass ratio, $ξ_d$, with those measured in 15 galaxies at $z>10$ from JWST spectra, when outflows are not included. Our model constrains $ξ_d$ as a function of several parameters by allowing wide variations in the IMF, dust/metal production, and dust destruction for a set of SN progenitor models and explosion energies. We find $\log ξ_d \approx -2.2$ for all systems, indicative of the dominant role of SN dust production over destruction in these early galaxies. Such value is strikingly different from the data, which instead indicate $\log ξ_d < -4$. We conclude that dust destruction alone can hardly explain the transparency of Blue Monsters. Other mechanisms, such as outflows, might be required. |
| title | Blue Monsters at $z>10$. Where has all their dust gone? |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2410.19042 |