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Treball de fi de grau

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cc-by-nc-nd (c) García-Cardoso, Judith, 2026
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/231382

Group and Field Galaxy Catalogs in TNG100: Assembly Bias and Gas Depletion

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We investigate the impact of the group environment on galaxy properties using the TNG100-1 simulation at z = 0. Analyzing 4,424 galaxies in 544 groups and 6,561 field galaxies (9.0 ≤log10(M⋆/M⊙) ≤ 12.0), we find that the Galaxy Stellar Mass Function (GSMF) is best described by a double-Schechter model across environments. Group members exhibit a higher mass than field counterparts, indicating environmental suppression of intermediate-mass satellites. Merger history analysis shows that single Brightest Group Galaxies (BGGs) experience twice as many mergers as BGGs in groups with multiple or no distinct centrals. While merger counts correlate with group richness and BGG stellar mass, they show no significant relationship with the r-band magnitude gap (Δm21). This implies that Δm21 encodes complementary information on halo assembly history, consistent with assembly bias. Finally, group satellites exhibit a mass-independent neutral hydrogen (H i) deficit of ∼ 0.4 dex relative to the field, which increases to ∼ 1.0 dex for BGGs with M⋆ >∼1010.5M⊙.

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Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2016, Tutors: Alberto Manrique Oliva, Jaime David Perea Duarte, José María Solanes Majúa

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GARCÍA-CARDOSO, Judith. Group and Field Galaxy Catalogs in TNG100: Assembly Bias and Gas Depletion. [consulted: 12 of September of 2026]. Available at: https://hdl.handle.net/2445/231382

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