2025/05/17 by Shrouk Abdulshafy, Mohamed H. Abdullah, Abdulshafy, Shrouk +7
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies
paper · doi:10.48550/arxiv.2505.12110
openalex publication_date 2025/05/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate a sample of 14 galaxy clusters from the GOGREEN and GCLASS (GG) spectroscopic datasets within the redshift range (0.87 ≤ z ≤ 1.37) and cluster masses M200 \gtrsim 2× 1014 \hm. Using the highly effective GalWeight technique for cluster membership assignment developed by our own team, we derive the dynamical parameters of these clusters through the virial mass estimator. We examine the velocity dispersion-cluster mass relation (σMR) for the GG cluster sample. We find, logσ200 = (2.94±0.02) + (0.37±0.07)logM200 with an intrinsic scatter of (σint = 0.02 ± 0.02). Our results demonstrate that the (σMR) relation is consistent with predictions from cosmological simulations, highlighting the reliability of the GalWeight technique for cluster membership assignment. Furthermore, the (σMR) validates the robustness of the virial mass estimator in accurately recovering cluster masses and associated parameters. Importantly, our findings confirm that velocity dispersion can be used directly to estimate cluster mass without relying on dynamical mass estimators.