Scholarship 24/06986-0 - Cosmologia observacional, Formação de estrelas - BV FAPESP
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Studying Galaxy Evolution at the High Redshift Domain: In-situ versus Ex-situ Star Formation

Grant number: 24/06986-0
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Start date until: June 01, 2024
End date until: May 31, 2025
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Extragalactic Astrophysics
Principal Investigator:Reinaldo Ramos de Carvalho
Grantee:Jéssica Beatriz da Cruz Raimundo
Host Institution: Pró-Reitoria de Graduação. Universidade Cidade de São Paulo (UNICID). São Paulo , SP, Brazil
Associated research grant:20/15245-2 - The multi-object spectrograph (MOSAIC) for the extremely large telescope: spectroscopy of stellar populations in the milky way and external galaxies, AP.ESP

Abstract

The study of how galaxies form and evolve over cosmic time is complex and remains an open topic within extragalactic astrophysics. The past decades have witnessed significant advancements in this field due to the acquisition of large quantities of high-quality data. Particularly at low redshifts, it is possible to have a reasonably clear picture that galaxies evolve through the growth of their stellar mass from the inside out, with a nucleus forming initially in-situ, followed by accretion through the merging of lower mass systems, ex-situ. In this work, we will examine spheroids in the redshift range 0.5 < z < 1.5, with stellar masses of approximately 10^10 M™. Using images obtained with the Hubble telescope in various photometric bands, we will study the color profiles of these systems to characterize the in-situ and ex-situ components and how they evolve over time. This information is critical for galaxy formation and evolution scenarios. The selection of these spheroids is based on morphological analysis conducted by our group, where we have shown through unsupervised methods that such samples can be significantly contaminated by disk systems if visual classifications are used. In summary, galaxies have their stellar mass established by in-situ star formation and subsequent accretion (ex-situ). Reconstructing the relative contributions of these two growth channels is fundamental for understanding the process of galaxy formation in the cosmological context.

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