Evolución de la población de galaxias fuertemente obscurecidas con altos corrimientos al rojo, en campos sin sesgos, con SPIRE y AzTEC.
Submillimeter galaxies (SMGs) have been understood as a population of heavily dust-enshrouded galaxies at high redshifts (z>1), with extreme star formation rates (SFR>500 Mꙩ/year). Recent studies suggest the existence of a growing population of SMGs with z>4, however a robust method is requ...
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2018 |
| País: | México |
| Institución: | Instituto Nacional de Astrofísica, Óptica y Electrónica |
| Repositorio: | Repositorio Institucional del INAOE |
| Idioma: | español |
| OAI Identifier: | oai:inaoe.repositorioinstitucional.mx:1009/1598 |
| Acceso en línea: | http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1598 |
| Access Level: | acceso abierto |
| Palabra clave: | info:eu-repo/classification/Inspec/High - 2 info:eu-repo/classification/Inspec/Star forming galaxies info:eu-repo/classification/Inspec/SMG info:eu-repo/classification/cti/1 info:eu-repo/classification/cti/21 |
| Sumario: | Submillimeter galaxies (SMGs) have been understood as a population of heavily dust-enshrouded galaxies at high redshifts (z>1), with extreme star formation rates (SFR>500 Mꙩ/year). Recent studies suggest the existence of a growing population of SMGs with z>4, however a robust method is required for the identification of the whole population in order to quantify its contribution to the star formation rate density (SFRD). In this work we identified ∼270 AzTEC (1.1mm) sources selected in 3 extragalactic fields: GOODS-South, GOODS-North and COSMOS (total area ∼0.86 deg² ). To achieve this, we searched for SPIRE counterparts at 250, 350 and 500 μm and using individual AzTEC/SPIRE photometry, we calculated sub-millimeter (submm) photometric redshifts and IR luminosities. On the other hand, CANDELS sources (1.6μm) were associated to AzTEC sources given their radio/IRAC counterparts found in the literature. Having the best identification for each AzTEC source and considering the undetected sources given the instrumental sensibility limits, we build the AzTEC corrected SFRD. This distribution has its peak at z ∼2 and shows a long broad high-z tail dominated by the LIRG population (L ≳10¹¹ Lꙩ), with 85% of the contribution, and the remaining 15% is given by the sub-sample of AzTEC sources characterized by having a lack of SPIRE counterparts at any band (SPIRE drop-outs) which were identified as ULIRGs (L ≳ 10¹² Lꙩ). The shape of the AzTEC corrected SFRD is in good agreement with other SFRD derived with IR observations or theorethical models. Also, an spectroscopic follow-up was conducted with the Redshift Search Receiver instrument at the Large Millimeter Telescope in a 32-m diameter configuration. Spectra were obtain from 3 SMGs that were selected as SPIRE drop-outs which have sub-mm photometric redshifts larger than 3. None of the spectra show robust CO lines, and therefore upperlimits were calculated for the CO luminosities of each source and these values are consistent within the L-L correlation of star-forming galaxies |
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