RT info:eu-repo/semantics/masterThesis
T1 The Formation Timescale Of Bulges In The BEARD Survey
A1 Sosa Guillén, Paula
A2 Máster Universitario en Astrofísica
AB The study of galaxy evolution has been a subject of intense debate within the astronomical community. Interactions between galaxies and secular processes leave distinctive imprints on the properties ofgalaxies, contributing to their evolution. The ΛCDM cosmological model has successfully explained thelarge-scale structures of the universe, but the evolution of luminous structures, such as galaxies, differsfrom the formation history of dark matter halos. The BEARD project focuses on studying the metallicityand abundance properties of a sample of 66 massive bulgeless galaxies in the nearby universe to gain abetter understanding of galactic evolution. The main objective of this work is to study the stellar populations properties in 27 galaxies from the BEARD sample, as well as to test the ability to obtain the ageof galaxies in the spectral range of 4963−5443 ˚A, which lacks lines sensitive to this parameter. The dataused in this study were collected using the MEGARA IFU instrument with the MR-G gratins installed inthe GTC. The method used was based on a python code implementing the pPXF algorithm adapted toour needs, and utilising the MILES SSP models. To ensure that our methodology used yields consistentresults, mock spectra models were developed by modifying MILES models to mimmick the MEGARAdata. These mock spectra were used to study two main parameters of our analysis: regularisation andsignal-to-noise ratio. Additionally, these models made it possible to determine the error associated withthe method, obtaining, in general, errors of ± 1 Gyr for ages younger than 4 Gyr, and errors always lessthan ±6.2 Gyr for older ages. For metallicity, an error of ±0.1 dex was obtained for all [M/H] values.The scientific results of this work were based on obtaining 21 maps of stellar populations along withtheir respective age-metallicity plane. Overall, a variety of results were found for the different bulges.We have analysed three galaxies of the sample which are NGC 5962, NGC 4405, and NGC 1087. Also,a comparative study was performed with the CALIFA survey (M´endez-Abreu et al., 2021) in order toshed some light on the bulge formation scenario. This study demonstrated the feasibility of determiningstellar populations in spectra without age-sensitive lines, using analyses of mock spectral models. It issuggested that galactic bulges in the BEARD sample are mainly formed from material in the galacticdisc and undergo internal secular evolution enriched with metals from previous generations of stars.
YR 2024
FD 2024
LK http://riull.ull.es/xmlui/handle/915/36528
UL http://riull.ull.es/xmlui/handle/915/36528
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 12-jul-2024