Extragalactic - Galaxies / Environment

Title: Exploring gas and stars of galaxies in different environments

Argudo-Fernández, Maria

Maria Argudo-Fernández, Instituto de Física, Pontificia Universidad Católica de Valaparaíso, Chile.

Paulo Vásquez-Bustos, Instituto de Física, Pontificia Universidad Católica de Valaparaíso, Chile.

Salvador Duarte Puertas, Département de Physique, de Génie Physique et d’Optique, Université Laval; Centre de Recherche en Astrophysique du Québec, Canada; and Instituto de Astrofísica de Andalucía (IAA-CSIC), Spain.

Simon Verley, Departamento de Física y Teoría del Cosmos, and Instituto Universitario Carlos I de Física Teórica y Computacional, Universidad de Granada, Spain.

Médéric Boquien, Centro de Astronomía, Universidad de Antofagasta, Chile.

Ute Lisenfeld, Departamento de Física y Teoría del Cosmos, and Instituto Universitario Carlos I de Física Teórica y Computacional, Universidad de Granada, Spain.

Daniel Espada, Departamento de Física y Teoría del Cosmos, and Instituto Universitario Carlos I de Física Teórica y Computacional, Universidad de Granada, Spain.

Abstract: We present here an overview of PASSAGES (exPloring gAS and StArs of Galaxies in different EnvironmentS), a project with the main aim of understanding what are the effects of the local and large-scale environments on galaxy formation and evolution by studying two main galaxy components: gas and stars.

The specific objectives to address are:

- To use galaxies in the SIG, SIP, and SIT as a novel approach to study the effect of environment on galaxy formation as a complement of its study ongalaxies in rich clusters, where significant work has been done.

- To explore the effects of the environment on galaxy properties, as the molecular gas distribution and stellar properties such us star formation, of these isolated systems.

Click here to see the full poster (Argudo-Fernández, Maria)

Title: Hot Dust Obscured Galaxies with Excess Blue Light

Assef, Roberto J.

Assef, Roberto J. (UDP)

Abstract: Hot Dust Obscured Galaxies are a class of obscured hyper-luminous quasars identified by the WISE mission. I focus here on a sub-population of Hot DOGs that show excess blue emission that resembles the emission expected for a second, less luminous unobscured AGN in the system. Imaging and spectroscopy have shown that the source of the blue excess is likely scattered light from the central obscured AGN, and recent polarimetry imaging with VLT has confirmed this scenario for one of the sources.

Click here to see the full poster (Assef, Roberto J.)

Title: Understanding the effects of the environment on the star formation of nearby galaxies

Castillo, Andrés

Andrés castillo, Maria Argudo-Fernandés, Instituto de Física PUCV

Abstract: New technologies for astronomical observation have made an important advance regarding the amount of information we receive from astronomical objects, like galaxies, and therefore the continued development of new data processing techniques and big data analysis is necessary. The SDSS-IV/MaNGA Integral Field Spectroscopy survey is providing data cubes for a sample of 10.000 galaxies, together with the data derived from the analysis of the cubes, in particular H-alpha maps. The Marvin tool allows easy and remote access to the MaNGA dataset to perform analysis on the data. We have developed a tool, which can be implemented in Marvin, to classify and analyse the morphology of galaxies, based on their structure parameters (Asymmetry, Gini Index, Inverse Concentration Index, Clumpiness, and Moment of Light, as defined in Lotz et al.). We have tested our methodology to quantify the morphology of galaxies on broad (r-band) and narrow (H-alpha) emission maps, not only to classify galaxy morphologies but also to identify galaxies with peculiar features in large datasets, like galaxies with nuclear star-forming rings (NSFR). We will show our methods and preliminary analysis of the star-forming properties of NSFR galaxies in comparison to normal star-forming galaxies.

Click here to see the full poster (Castillo, Andrés)

Click here to see the full poster (Mesias, Javiera)

Title: Quantification of vertical perturbation in disc galaxies from TNG50 simulations

Mora-Urrejola, Catalina

Facundo Gómez and Sergio Torres, Universidad de La Serena

Abstract: We present the first results of the characterization of the vertical structure of 278 simulated galactic discs of the TNG50 Project. Vertical perturbations on the galactic disc can be induced by different mechanisms such as close encounters with satellites, distant flyby of massive galaxies, gas accretion from halo infall, or mergers. Here we quantify the predominant perturbation mechanisms behind the vertical unrelaxed discs at z=0. In addition, we show the relationship between the vertical disc structure. This study allows us to characterize how frequent vertical patterns such as those observed in the Milky Way, arise in the Local Universe.

Click here to see the full poster (Mora-Urrejola, Catalina)

Title: CALSAGOS: Clustering ALgorithmS Applied to Galaxies in Overdense Systems

Olave-Rojas, Daniela

D. E. Olave-Rojas (Universidad de Talca), P. Cerulo (Universidad de Concepción), P. Araya-Araya (Universidade de São Paulo), D. A. Olave-Rojas (Karlsruhe Institute of Technology), D. Pallero (Universidad de Valparaiso), Y. Jaffé (Universidad de Valparaiso), Claudia Mendes de Oliveira (Universidade de São Paulo)

Abstract: The study of galaxy properties in the outskirts of galaxy clusters is crucial to study the galaxy evolution. However, the first difficulty to overcome in studies of galaxy evolution in clusters is the accurate detection of substructures and infalling groups. For this reason, in this poster we present the version one of “CALSAGOS” which is a python module based on clustering algorithms that has the ability to search, find and identify groups and substructures principally in the outskirts of galaxy clusters. Our module can be used with spectroscopic and photometric data as input and has been probed using mocks catalogues from S-PLUS collaboration.

Click here to see the full poster (Olave-Rojas, Daniela)

Title: BROAD EMISSION-LINE WINGS: IONIZED GAS KINEMATICS OF FIVE LYMAN CONTINUUM EMITTERS

Rodríguez, Matías

Matías Rodríguez ( Universidad de La Serena, Departamento de Astronomía, Universidad de La Serena), Ricardo Amorín (Instituto de Investigación Multidisciplinar en Ciencia y Tecnología. Universidad de La Serena, Departamento de Astronomía, Universidad de La Serena)

Abstract: Using high dispersion optical spectra from VLT/XShooter we study the ionized gas kinematics of five Lyman continuum emitters at z ~ 0.3 with escape fractions between 3~46 percent. All the galaxies show asymmetric emission-line profiles that can be well reproduced with multiple Gaussian components. A broad component with intrinsic velocity dispersion of ~ 90-210 km/s is present in all the objects of the sample, which is blue shifted with respect to the global velocity profile, thus suggesting an unresolved outflow. Narrow components with intrinsic velocity dispersion of ~ 40-60 km/s contribute a great percentage of the global flux emissions and trace the prominent HII regions inside the galaxies. Classic diagnostics diagrams show all the components at the limit of excitation by photoionization thus indicating very strong radiation fields. Our results suggest outflows and strong gas turbulence driven by stellar winds and SNe feedback may be responsible for creating channels within a likely clumpy interstellar medium from which LyC photons escape into the intergalactic medium. Finally, we explore relations between the escape fraction of LyC photons and the ionized gas kinematics.

Click here to see the full poster (Rodríguez, Matías)

Title: Insight into the physical processes that shape the metallicity profiles in galaxies

Tapia, Brian

Tapia, Brian (IA-PUC), Tissera, Patricia B (IA-PUC; Centro astro-ingeniería PUC)

& The CIELO Collaboration * IA-PUC: Instituto de Astrofísica PUC

Abstract: Chemical abundance profiles store information about the history of galaxy formation. These patterns are the result of the complex interplays between a variety of physical processes such asgas inflows/outflows, SN/AGN feedback, galaxy mergers and interactions, etc. Using a set of simulations of the Chemo-dynamIc propErties of gaLaxies and the cOsmic web project, CIELO, we aim to reveal the relationships between the profile characteristics and the main events that participate in the formation of galaxies. We present and discuss the preliminary results of our work.

Click here to see the full poster (Tapia, Brian)

Title: Hydra cluster galaxies: bulge-disc decomposition in 12 S-PLUS bands

Lima-dias, Ciria

Lima-dias, Ciria; Monachesi, Antonela and Torres-Flores, Sergio Universidad de La Serena

Abstract; Galaxy clusters are a perfect laboratory to study the evolution of galaxies in dense environments, and current multiwavelength surveys provide us with the possibility to observe changes in colors and morphology of galaxies in different filters. In this work, we use the Southern Photometric Local Universe Survey, which has 12 filters in the visible range of the spectrum, to perform a bulge-disc decomposition in the Hydra cluster galaxies. It is important to study the different components of a cluster galaxy separately because these will be influenced by the environment in different ways. In this poster, I will present the first study of a bulge-disc decomposition of the Hydra cluster galaxies, where we investigate the behavior of the galaxy component’s structural properties (Sérsic index and effective radius) for each S-PLUS filter. We analyze this in combination with the galaxies’ physical properties (stellar mass and star formation rate). We found that the bulges are bluer than the discs for the Hydra’s star-forming galaxies, meaning that the star formation is more concentrated in the central part of the galaxy. Additionally, we found that 35% of the galaxies are bulge-dominated.

Click here to see the full poster (Lima-dias, Ciria )