Comunicazione

Does the virial mass drive the intracluster Light?

Ragusa R.
  Mercoledì 13/09   09:00 - 13:30   Aula F4 - Henrietta Leavitt   III - Astrofisica   Presentazione
The LCDM paradigm suggests that the intracluster light (ICL) in galaxy clusters is formed due to the gravitational interactions that occur during the formation of the Brightest Cluster Galaxies (BCG). As a result, the ICL serves as a fossil record of the mass assembly process in galaxies, and its physical properties (luminosity, color, stellar population, fraction ($f_{ICL}$)), provide insights into the formation mechanisms that contributed to the ICL and the dynamical and evolutionary state of the system. Understanding how the $f_{ICL}$ is related to the virial mass ($M_{vir}$) of the host environment can help to better understand the physical processes involved in the formation of the ICL. Detecting and studying the ICL is a challenging task due to its low surface brightness and extension, requiring deep imaging and wide field and despite limited measurements of $f_{ICL}$, no clear conclusion on the correlation with $M_{vir}$ has been established. In this talk, I explore the relationship between $f_{ICL}$ and $M_{vir}$, as well as $f_{ICL}$ and $f_{ETG}$ ($N_{ETG}/N_{ETG}+N_{LTG}$). This was achieved through a statistically significant and homogeneous sample of 22 groups and clusters ($z<0.05$), taking advantage of the VEGAS data.