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RXCJ1111.6+4050 galaxy cluster: the observational evidence of a transitional fossil group | | R. Barrena
; G. Chon
; H. Böhringer
; J. Méndez-Abreu
; A. Ferragamo
; | | Date: |
1 Sep 2023 | | Abstract: | We present a detailed kinematical and dynamical study of the galaxy cluster
RXCJ1111.6+4050 (RXCJ1111), at z = 0.0756 using 104 new spectroscopic redshifts
of galaxies observed at the TNG 3.5m telescope and SDSS DR16 public archive.
Our analysis is performed in a multiwavelength context in order to study and
compare mainly optical and X-ray properties using XMM-Newton data. We find that
RXCJ1111 is a galaxy cluster showing a velocity distribution with clear
deviations from Gaussianity, that we are able to explain by the presence of a
substructure within the cluster. The two cluster components show velocity
dispersions of $644 pm 56$ km/s and $410 pm 123$ km/s, which yield dynamical
masses of M$_{200}$=$1.9 pm 0.4 imes10^{14}$ M$_{odot}$ and $0.6 pm 0.4
imes 10^{14}$ M$_{odot}$ for the main system and substructure, respectively.
RXCJ1111 presents an elongation in the North-South direction and a gradient of
250-350 km/s/Mpc in the velocity field, suggest that the merger axis between
the main system and substructure is slightly tilted with respect to the
line-of-sight. The substructure is characterized by a magnitude gap $Delta
m_{12} ge 1.8$, so it fits the "fossil-like" definition of a galaxy group.
Mass estimates derived from X-ray and optical are in good agreement when two
galaxy components are considered separately. We propose a 3D merging model and
find that the fossil group is in an early phase of collision with the RXCJ1111
main cluster and almost aligned with the line-of-sight. This merging model
would explain the slight increase found in the T$_X$ with respect to what we
would expect for relaxed clusters. Due to the presence of several brightest
galaxies, after this collision, the substructure would presumably lose its
fossil condition. Therefore, RXCJ1111 represents the observational evidence
that the fossil stage of a system can be temporary and transitional. | | Source: | arXiv, 2309.00412 | | Services: | Forum | Review | PDF | Favorites | |
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