Figueras Siñol, FrancescaAltamirano Bonilla, Joseph David2021-10-142021-10-142021-07https://hdl.handle.net/2445/180562Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2021, Tutora: Francesca Figueras SiñolIn this work we compare the spiral structure depicted by two stellar tracers with very different ages: an extremely young population of OB type stars and a population of Red Clump stars assumed to be relaxed in the Galactic potential. A Kernel density estimator applied to Gaia and StarHorse EDR3 data allow us to trace the over/under-density maps on the Galactic plane at± 3 kpc from the Sun location. Preliminary results confirm that Perseus and Sagittarius-Carina arms are well delineated in both samples and possible offsets between their locus are evaluated. More important, the surface density amplitude of the young population is estimated to be a factor 2-3 larger than that of the old population. These results provide new insights to discern on the mechanisms by which the Milky Way spiral arms evolve5 p.application/pdfengcc-by-nc-nd (c) Altamirano, 2021http://creativecommons.org/licenses/by-nc-nd/3.0/es/Braços espiralsEvolució estel·larTreballs de fi de grauSpiral armsStars evolutionBachelor's thesesinfo:eu-repo/semantics/bachelorThesisinfo:eu-repo/semantics/openAccess