González Esquivel, Bárbara Antonia
Chile Universidad de La Serena
Low X-ray Luminosity Clusters in the eROSITA Era: The Special Case of AS555
Galaxy clusters are the largest gravitationally bound structures in the universe, and they are considered excellent laboratories for studying galaxy evolution and the large-scale structure (LSS) of the universe. Following this idea, great efforts have been made to study these systems at multiple wavelengths. For example, in X-rays using ROSAT space observatory, the intracluster medium (ICM) of these clusters has been detected over the whole sky, but with a bias towards more massive systems due to instrumental limitations.
Considering this, galaxy clusters of low X-ray luminosity are defined as those having Lx < 10^44 erg/s in the [0.1-2.4 keV] band, and currently, with the instrumental capabilities of eROSITA, even more of these systems can be detected, and therefore we can study them with greater statistical significance.
In this work, we present results of a detailed study of the nearby cluster (z = 0.044) Abell S555 (AS555), using optical images from DECaLS DR10, eROSITA X-ray catalogs and information obtained from the literature (e.g. BCG integral field spectroscopy). This cluster meets the definition of low X-ray luminosity considering the ROSAT data and qualitatively appears to have a relaxed dynamical state in the optical. However, eROSITA detected 3 peaks of its ICM, which could indicate active gas dynamics. Consequently, this study will serve as the kickoff for an even larger one, using the large volume of data from the DEROSITAS survey.