Efecto de lente gravitacional unificado: una aproximación a la reconstrucción del perfil de masa de un cúmulo galáctico
In this work, we present the description, implementation, and application of a free-form reconstruction method that makes use of the gravitational lensing effect to produce an estimation of the mass profile of a galaxy cluster. In particular, multiply-imaged systems (strong regime) and the apparent...
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| Formato: | tesis de maestría |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2020 |
| País: | Colombia |
| Recursos: | Universidad Nacional de Colombia |
| Repositorio: | Repositorio UN |
| Idioma: | español |
| OAI Identifier: | oai:repositorio.unal.edu.co:unal/79127 |
| Acesso em linha: | https://repositorio.unal.edu.co/handle/unal/79127 |
| Access Level: | acceso abierto |
| Palavra-chave: | 520 - Astronomía y ciencias afines Gravitational lensing Galaxy clusters Abell 370 Lentes gravitacionales Cúmulos galácticos |
| Resumo: | In this work, we present the description, implementation, and application of a free-form reconstruction method that makes use of the gravitational lensing effect to produce an estimation of the mass profile of a galaxy cluster. In particular, multiply-imaged systems (strong regime) and the apparent ellipticity of background sources (weak regime) are employed. This method is an extension of the scheme given in SWUnited, where we have included an alternative approach to the irregular and adaptive grid refinement, as well as two penalty functions $\chi^2_s$ for the strong regime, which for our implementation have proven to be numerically more stable than the one suggested in SWUnited. The method was applied to two mock models, for which their mass profiles have been recovered effectively, even when only multiply-imaged systems are considered. If ellipticities are included, the region of action widens. This method has also demonstrated to be capable of recovering the critical curves produced by the lens, nonetheless, there are difficulties in recovering some of the multiply-imaged systems in their entirety. The reconstruction method was also applied to the galaxy cluster Abell 370, where it was possible to recover in both shape and size its characteristic arc. Furthermore, the mass enclosed within a radius of $\theta\approx 1.1\;(arcmin)$ was found to be in the range of $(4.5-4.7)\times 10^{14} M_{\odot}$. |
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