Búsqueda de materia oscura
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2025
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Este trabajo consiste en la búsqueda de materia oscura por métodos indirectos, en concreto, por aniquilación de partículas de materia oscura a partículas del Modelo Estándar. Para ello, hemos utilizado como instrumento de medida el Telescopio Espacial de Rayos Gamma Fermi, en particular, el LAT (Large Area Telescope).
En cuanto a los objetivos de la búsqueda, nos hemos centrado en las galaxias esferoidales enanas (dSph), las cuales están dominadas por materia oscura y tienen una baja emisión de procesos astrofísicos estándar.
Utilizando un análisis de máxima verosimilitud hemos extraído mucha información de interés sobre nuestra fuente de estudio, como pueden ser: mapas de excesos, mapas de significancia estadística, o la distribución espectral de energía (SED), entre otros.
Además, a partir de la SED hemos calculado límites superiores a la sección eficaz de aniquilación de materia oscura en función de su masa. También hemos estudiado cómo varía la significancia estadística con respecto a la masa y con respecto al tiempo de exposición. Todo ello para distintos canales de aniquilación.
This work focuses on the search for dark matter through indirect methods, specifically by the annihilation of dark matter particles into Standard Model particles. To this end, we have used the Fermi Gamma-ray Space Telescope as the measuring instrument, particularly the LAT (Large Area Telescope). In terms of search targets, we have focused on dwarf spheroidal galaxies (dSph), which are dominated by dark matter and have low emission from standard astrophysical processes. Using a likelihood analysis, we have extracted significant information about our study source, such as excess maps, statistical significance maps, and the spectral energy distribution (SED), among others. Furthermore, from the SED, we have calculated upper limits on the dark matter annihilation cross section as a function of its mass. We have also studied how the statistical significance varies with mass and with exposure time. All of this has been done for different annihilation channels.
This work focuses on the search for dark matter through indirect methods, specifically by the annihilation of dark matter particles into Standard Model particles. To this end, we have used the Fermi Gamma-ray Space Telescope as the measuring instrument, particularly the LAT (Large Area Telescope). In terms of search targets, we have focused on dwarf spheroidal galaxies (dSph), which are dominated by dark matter and have low emission from standard astrophysical processes. Using a likelihood analysis, we have extracted significant information about our study source, such as excess maps, statistical significance maps, and the spectral energy distribution (SED), among others. Furthermore, from the SED, we have calculated upper limits on the dark matter annihilation cross section as a function of its mass. We have also studied how the statistical significance varies with mass and with exposure time. All of this has been done for different annihilation channels.