الفهرس | Only 14 pages are availabe for public view |
Abstract This dissertation presents the results of a spectroscopic analysis of the X-CLASS-redMaPPer (XC1-RM) galaxy cluster sample. The XMM Cluster Archive Super Survey (X-CLASS) is a new catalogue of 1646 well-selected X-ray-detected clusters over a wide sky area, while redMaPPer is an optical cluster catalogue derived from the Sloan Digital Sky Survey (SDSS). The present sample comprises 92 X-ray extended sources identified in optical images within 10 separation. The area covered by the cluster survey is ∼ 27 deg2 . The clusters span a wide redshift range (0.05 < z < 0.6). The main goal of this study is to derive Xray observable (e.g.:Temperatures, Luminosities, fluxes, Gas mass) for a sample of galaxy clusters in the X-CLASS and to investigate their scaling relations. We developed an automated technique to derive the X-ray properties of the clusters in three distinct apertures: R500 (at fixed mass overdensity), Rfit (at fixed signal-to-noise ratio), R300kpc (fixed physical radius). We determined spectroscopic redshifts for 90 clusters based on SDSS-DR14. The results are found to agree with the most recent studies. I investigate the luminosity-temperature (L-T) relation of the XC1-RM sample and find a slope equal to 3.03 ± 0.26. It is steeper than predicted by self-similar assumptions, agreeing with independent studies. In order to investigate the impact of selection biases, we run a set of simulations reproducing the characteristics of the measurement process. The result of the simulation process suggests that the measured L-T relation is biased to a steeper slope and higher normalization. We developed an automated pipeline to derive the gas masses (Mgas) within R500 in the energy band [0.5- 2.0] keV for fifty-five clusters. The total masses M500 for fifty-five clusters were driven from two independent mass scaling relation (Mgas-M500-z, M500-Yx). The M500 results obtained from the two relations are consistent. We studied the scaling relations connecting gas mass, temperature, and luminosity. The slopes of the Mgas-T (2.15 ± 0.20) and L-Yx (0.93 ± 0.04) relations are steeper than predicted by self-similar assumption. The independent measurements of the individual cluster masses, and further investigation on the evolution of the scaling relations will be done in the future work |