[Graduados] Recordatorio: Hoy 13h - Seminario FCAG - "Galaxy evolution in compact groups" - Dra. Gissel Pardo Montaguth (IAG - Universidad de Sao Paulo, Brasil)

[Secretaría de Ciencia y Técnica]

Buenos días,

les recordamos que *hoy a las 13h *se brindará, en el Salón Meridiano, 
una charla en el marco de los Seminarios de la FCAG. A continuación les 
dejamos información sobre la misma y los datos de conexión para aquellos 
que no puedan acercarse al Salón Meridiano.

Seminario FCAG *"Galaxy evolution in compact groups***"*, a cargo de la 
**Dra. G**issel Pardo Montaguth* (IAG - Universidad de Sao Paulo, 
Brasil)*, profesora invitada por la Dra. Analía Smith Castelli.*

*Resumen:*Compact groups (CGs) provide a valuable opportunity to study 
how galaxy interactions influence physical and structural parameters due 
to their high density and low-velocity dispersion. We investigated a 
sample of 340 CGs, including 1,092 galaxies, and compared it with a 
control group of 2,300 field galaxies to explore these effects. Our 
analysis of the Effective Radius–Sérsic Index (Re-n) plane revealed a 
bimodal distribution among transitioning galaxies in CGs. We define the 
transition galaxies as those with redder colors (u-r > 2.3) and Sérsic 
indices (n < 2.5). This suggests the presence of a distinct population 
of smaller, more compact galaxies in CGs, a population that is absent in 
the control sample. This observation indicates that galaxies in CGs may 
undergo significant morphological changes. Around 27% of the CGs are 
part of larger groups, which we classify as non-isolated CGs. Transition 
galaxies in isolated CGs are more likely to cluster in a denser region 
of the Re–n plane when n < 1.75. In contrast, transition galaxies in 
non-isolated CGs show a more gradual increase in n values, indicating 
that these galaxies have experienced morphological transformations and 
are the main contributors to the distribution of more compact galaxies 
in the Re–n plane among all transition galaxies in CGs. Moreover, 
galaxies in non-isolated CGs display lower specific star formation rates 
and a higher proportion of quenched galaxies compared to their isolated 
counterparts.  Furthermore, a spatially resolved analysis was performed 
using integral field spectroscopy (IFS) data to study both ionized gas 
and stellar components in 549 galaxies in CGs and 1,098 field galaxies. 
Galaxies in CGs tend to have older stellar populations, although 
star-forming galaxies show similar ΣSFR profiles to those in the field. 
However, galaxies with nuclear activity in CGs exhibit higher ΣSFR 
values and flatter slopes. No significant differences were found in the 
metallicity gradients between CG and field galaxies. In summary, we 
highlight the critical role of the environment in the evolution of 
galaxies in CGs, emphasizing how dense environments and interactions 
accelerate morphological transformation and the quenching process.

*

Datos de conexión

Unirse a la reunión zoom:https://us02web.zoom.us/j/89642687970 
<https://us02web.zoom.us/j/89642687970>

ID de reunión: 896 4268 7970

Código de acceso: 526656

**

A fin de reducir el uso de residuos plásticos, les solicitamos que se 
acerquen con sus propias tazas para el café. Aunque este seminario será 
en formato híbrido, esperamos contar con su presencia.

*
*

Saludos,

SeCyT-FCAG

*

-- 
Secretaría de Ciencia y Técnica
Facultad de Ciencias Astronómicas y Geofísicas
Horario de atención: lunes a viernes de 8hs a 15hs
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