Dust at the Cosmic Dawn
Observations provided by the <i>Hubble Space Telescope (HST)</i> and <i>James Webb Space Telescope (JWST)</i> have revealed a surprising abundance of galaxies at the “cosmic dawn” epoch, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" displ...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-05-01
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| Series: | Galaxies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4434/13/3/64 |
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| Summary: | Observations provided by the <i>Hubble Space Telescope (HST)</i> and <i>James Webb Space Telescope (JWST)</i> have revealed a surprising abundance of galaxies at the “cosmic dawn” epoch, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>z</mi><mo>></mo><mn>7</mn></mrow></semantics></math></inline-formula>. Some of them are found even in a more distant universe at <i>z</i> ≃ 14–16. Most of these galaxies appear to be intriguing: they are found to be either super-bright in the rest-frame ultraviolet (UV) band or super-dusty with a heavily reddened stellar population. The transition from the super-bright and super-dusty regimes seems to occur in the redshift range from <i>z</i>∼10.5 to <i>z</i>∼9.5 within a time range of ∼50 Myr. If confirmed, then the origin of this transition is far from being clear. In the review, we discuss possible mechanisms that can make <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>z</mi><mo>></mo><mn>10</mn></mrow></semantics></math></inline-formula> galaxies free of dust and also explain the origin of apparently excessive dust in galaxies at intermediate and lower redshifts <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>z</mi><mo><</mo><mn>10</mn></mrow></semantics></math></inline-formula>. |
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| ISSN: | 2075-4434 |