Preliminary Program

Invited talks are planned for 30 minutes (plus 10 minutes for questions), while contributed talks are allocated 20 minutes (plus 5 minutes for questions), please take this into account when preparing your presentation.

Detailed preliminary program

The meeting will feature a mix of invited talks, contributed talks, and a special
jamboree session for young researchers. There will also be
coffee breaks, a poster session, and group discussions, fostering an
interactive and engaging environment. The total duration of the
meeting is five days.

MIND THE GAP:

Galaxies and the Large-Scale Structure

POSTERS

1)

Colazo, Agustina del Valle  (Undergraduate student)

Argentina   Instituto de Astronomía Teórica y Experimental

Evolution of central galaxy alignments in the IllustrisTNG hydrodynamical simulation

Previous studies indicate that the alignment between the central galaxies’ shape and the distribution of matter in their surroundings strongly depends on their color. Also, these alignments evolve very differently when considering the stellar component of the central galaxy or its dark matter halo. Motivated by these results, we aim to deepen the analysis of how various astrophysical processes influence  central galaxy alignments with the matter distribution. In this context, we concentrate on the role of mergers in aligning the baryonic component with the dark matter. In this work, we use the most massive central galaxies in groups selected at z = 0 in the IllustrisTNG 300 hydrodynamic simulation then we follow the main branch of the central galaxies’ merger tree to study the evolution of the alignment between the shape of the stellar component and the shape of the halo, as well as how the angle between the semi-axes of the central galaxy’s shape tensor and its angular momentum changes over time.

2)

Mesa, Valeria  (Researcher)

Chile   ULS/AURA

The impact of bars in active galactic nuclei galaxies

Nuclear activity is associated with internal disturbances that move gas towards the central regions of galaxies. Galactic bars are considered a key factor in this phenomenon, as their presence can lead to angular momentum loss, resulting in the redistribution of gas and its concentration in the galactic nucleus. To examine how bars affect the activity of active galactic nuclei (AGN), a sample of spiral galaxies with active nuclei and visible bars at z<0.1 was compiled using morphological data provided by Galaxy Zoo DECaLS. Similarly, a control group of AGN galaxies without bars, with comparable characteristics in stellar mass, magnitude, and redshift, was selected. Properties such as stellar mass, color, and the Dn4000 index were evaluated in relation to L[OIII] and the accretion rate R, both robust indicators of nuclear activity. The results showed that galaxies with bars exhibit higher values of L[OIII] and R compared to the control group. Moreover, the proportion of galaxies with intense AGNs is significantly higher in those possessing bars, particularly in galaxies with younger and bluer stellar populations.

3)

Rapoport, Juana Catalina  (Estudiante de Licenciatura)

Argentina   FaMAF – OAC

Secondary Biases in Cosmological Simulations with different values of ΩM

Secondary biases show that for dark matter halos of equal mass, the level of clustering with neighboring structures increases or decreases when a second property is considered. Since halos correspond to peaks in a density field that evolves according to a cosmological model, the existence of secondary biases implies that mass alone is not sufficient to characterize the evolution of that field. In this work, we explore the possibility of using the observed distribution of halos and their relationship with mass and secondary properties to infer the value of cosmological parameters. To this end, we present preliminary results of the measurement of secondary biases in cosmological simulations for different values of ΩM in flat universe.

4)

Schachner, Alvaro Roy  (Grade Student)

Argentina   FAMAF – UNC

Enhancing the Popcorn Void Finder: Adapting for Real Galaxy Catalogs and its impact on Observational Cosmology

Cosmic voids are key structures to understand the geometry and expansion history of the Universe. With the new generation of galaxy surveys, research into void detection algorithms becomes becomes essential to obtain a reliable population of voids in order to design precise cosmological tests. “Popcorn Void Finder” offers a natural extension to the so-called spherical void algorithm that identifies voids more precisely, overcoming present limitations found in spherical void methods. The model was developed and tested in numerical simulations, proving to be specially useful for abundance analyses, from which we can constrain key cosmological parameters. This work proposes an adaptation to Popcorn for applications in observational data, implementing methods for managing selection functions and observational effects present in real galaxy catalogues. Furthermore, the code will be refactored and optimized following modular design guidelines and good programming practices. The soundness and performance of the improved algorithm will be validated trough exhaustive testing with simulated and observational data.

5)Wang, Yikun  (Case Western Reserve University)

United States

A New Measure of Assembly Bias: The Environment Dependence of the Luminosity Function

Assembly bias is an important phenomena to understand the galaxy-halo connection and to help constrain the cosmological parameters. While previous theoretical works have typically explored assembly bias through galaxy clustering, we find that considerable assembly bias effects also manifest in the environmental dependence of the luminosity function, which appears to be a promising new measure of it.