Redshift Horizon for Detecting the First Galaxies in Far-infrared Surveys
We explore the possibility of detecting the first galaxies with the next generation of space-based far-infrared (FIR) telescopes by applying an analytical model of primordial dust emission. Our results indicate that FIR/submillimeter sources at z ⪆ 7 will experience a strong negative K-correction. S...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2019 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/182603 |
| Acceso en línea: | http://hdl.handle.net/11336/182603 |
| Access Level: | acceso abierto |
| Palabra clave: | COSMOLOGY: THEORY DUST GALAXIES: EVOLUTION GALAXIES: HIGH-REDSHIFT https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| Sumario: | We explore the possibility of detecting the first galaxies with the next generation of space-based far-infrared (FIR) telescopes by applying an analytical model of primordial dust emission. Our results indicate that FIR/submillimeter sources at z ⪆ 7 will experience a strong negative K-correction. Systems of a given virial mass would exhibit larger dust luminosities at higher z, as a consequence of the increase in dust temperature driven by the higher temperature floor set by the cosmic microwave background. In addition, high-z systems are more concentrated, which enhances the heating efficiency associated with stellar radiation. By analyzing source densities as a function of z, and considering survey areas of 0.1 and 10 deg2, we find that the redshift horizon for detecting at least one source would be above z ∼ 7 for instrument sensitivities ≲0.1-0.5 and ≲0.5-3.0 μJy, respectively, with the exact values depending on the nature of primordial dust. However, galaxy populations with higher than typical metallicities, star formation efficiencies, and/or dust-to-metal ratios could relax such sensitivity requirements. In addition, the redshift horizon shows a significant dependence on the nature of primordial dust. We conclude that future FIR campaigns could play a crucial role in exploring the nature of dust and star formation in the early universe. |
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