Multi-wavelength studies of submillimetre galaxies: constraining their physical properties through cosmic time
This doctoral dissertation comprises new astronomical observations and a detailed analysis of the biases imposed by selection effects in submillimetre surveys, increasing our understanding of the physical properties of submillimetre galaxies (SMGs). Using simulations, we show that some of the publis...
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| Formato: | tesis doctoral |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2017 |
| País: | México |
| Recursos: | Instituto Nacional de Astrofísica, Óptica y Electrónica |
| Repositorio: | Repositorio Institucional del INAOE |
| Idioma: | inglés |
| OAI Identifier: | oai:inaoe.repositorioinstitucional.mx:1009/840 |
| Acesso em linha: | http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/840 |
| Access Level: | acceso abierto |
| Palavra-chave: | info:eu-repo/classification/Galaxias/Galaxies info:eu-repo/classification/Galaxias Submilimétricas/Submillimetre galaxies info:eu-repo/classification/Evolución Galaxy/Galaxy evolution info:eu-repo/classification/Astronomía submilimétrica/Submillimetre astronomy info:eu-repo/classification/Alto desplazamiento al rojo/Hight redshift info:eu-repo/classification/Formación estelar/Star formation info:eu-repo/classification/cti/1 info:eu-repo/classification/cti/21 info:eu-repo/classification/cti/2101 info:eu-repo/classification/cti/210103 |
| Resumo: | This doctoral dissertation comprises new astronomical observations and a detailed analysis of the biases imposed by selection effects in submillimetre surveys, increasing our understanding of the physical properties of submillimetre galaxies (SMGs). Using simulations, we show that some of the published redshift distributions, which were previously reported to be statistically different, are consistent with a common parent distribution when selection effects are taken into account. The differences can be explained through wavelength selection, depth of the surveys, and to a lesser degree, angular resolution. This implies that systems selected at any single wavelength are not representative of the whole population of SMGs. We also present deep observations at 450 and 850 μm in the Extended Groth Strip (EGS) field taken with the SCUBA-2 camera on the James Clerk Maxwell Telescope (JCMT) as part of the SCUBA-2 Cosmology Legacy Survey (S2CLS). We derive the number counts at flux densities of S450μm > 4.0 mJy and S850μm > 0.9 mJy, which represent the deepest number counts at these wavelengths derived using directly extracted sources from only blank-field observations with a single-dish telescope. Our measurements smoothly connect the gap between previous shallower blank-field single-dish surveys and deep ALMA results.We estimate the contribution of our SCUBA-2 detected galaxies to the cosmic infrared background (CIB), as well as the contribution of 24 μm-selected galaxies through a stacking technique, which correspond to 60±20 and 50±20 per cent of the total CIB measurements at 450 and 850 μm, respectively. The physical properties of these galaxies are also derived trough a multi-wavelength counterpart analysis. The redshift distribution of the 450 and 850 μm samples are different with median redshifts of ¯z = 1.66 ± 0.18 and ¯z = 2.30 ± 0.20. However, the two populations have similar infrared (IR) luminosities, SFRs, and stellar masses, with mean values of ∼ 1.5 × 10exp12 L⊙, 150 M⊙ yr−1, and 9 × 10exp10 M⊙, respectively. This places most of our sources (∼ 85 percent) in the high-mass end of the `main-sequence’ of star-forming galaxies. |
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