Molecular diversity in High Mass Star Forming Regions
In current studies on massive star formation, several uncertainties remain, including questions about the source of mass reservoir, the process of accretion and ejection, and how these mechanisms overcome radiation pressure to allow substantial mass accretion. When examining the accretion-ejection p...
| Autor: | |
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| Tipo de recurso: | tesis doctoral |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2024 |
| País: | México |
| Institución: | Instituto Nacional de Astrofísica, Óptica y Electrónica |
| Repositorio: | Repositorio Institucional del INAOE |
| Idioma: | inglés |
| OAI Identifier: | oai:inaoe.repositorioinstitucional.mx:1009/2548 |
| Acceso en línea: | http://inaoe.repositorioinstitucional.mx/jspui/handle/1009/2548 |
| Access Level: | acceso abierto |
| Palabra clave: | info:eu-repo/classification/Early-type/Early-type info:eu-repo/classification/High Mass Star/High Mass Star info:eu-repo/classification/Outflows/Outflows info:eu-repo/classification/Interstellar molecules/Interstellar molecules info:eu-repo/classification/Astrochemistry/Astrochemistry info:eu-repo/classification/cti/1 info:eu-repo/classification/cti/21 info:eu-repo/classification/cti/2199 |
| Sumario: | In current studies on massive star formation, several uncertainties remain, including questions about the source of mass reservoir, the process of accretion and ejection, and how these mechanisms overcome radiation pressure to allow substantial mass accretion. When examining the accretion-ejection process, understanding the chemical composition of the outflow (and, if possible, the pristine jet) becomes crucial. Therefore, a detailed analysis of these outflows is essential for gaining insights into the complexities of massive star formation. In this thesis, we present the outcomes of three sub-projects focusing on the investigation of the chemical composition and enrichment of Interstellar Complex Organic Molecules (iCOMs) within a sample of Massive Young Stellar Objects (MYSOs). These objects have been identified to harbor active ongoing accretion, as evidenced by their observed outflow movements. The intense movements induced by outflows, particularly high-velocity shocks, have influenced a distinctive chemistry within this MYSO sample. Observed in the faint broad line profiles that some iCOMs emission lines exhibit, we have identified these molecules tracing the outward regions from the core, aligning with the observed outflow path. This suggests that their chemical enhancement is attributed to the outflow itself. Our dataset comprises MYSOs chosen from Extended Green Objects (EGOs) and APEX Telescope Large Area Survey of the Galaxy (ATLASGAL) sources. The selection process was guided by a survey aimed at identifying potent emitters of SiO 2-1 and 1-0 transitions, conducted using single-dish facilities in a prior study. Additionally, we include the nearest High Mass Star Forming Region (HMSFR) available: Orion-KL. The data encompass both single-dish and interferometric observations, and we provide a detailed description in separated chapters for each sub-project. |
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