LGRT 1033 Lecture Area
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Titie: STATISTICAL CHARACTERIZATION OF THE X-RAY INTENSITY DISTRIBUTION IN GALAXY CLUSTERS OUTSKIRTS
Abstract: Hot gas halo is the major baryon component of galaxy clusters and galaxy groups, which impacts and reveals the evolution of the universe, from galaxy scale to the cosmos scale. Due to the limited sensitivity of X-ray telescope, this kind of research mostly is from the stacking analysis of clusters (e.g. Eckert 2012, Anderson et al. 2015)and groups or from very nearby and massive clusters (e.g. Bautz et al. 2009). However, Hot gas halos are very extending and we always observe the 3-dimension on the 2-dimension sky, this introduce very strong projection e ect when we did the stacking analysis, especially for the faint outskirt of hot gas halo and poor clusters and groups. In this work, we used ROSAT All-sky Survey data and analysis the X-ray emission from all group halos discovered by SDSS, 2MRS, 6dF and 2dF. Compared to stacking analysis, we developed a simultaneous fitting method to solve the problem about the overlapping between groups halos. We shows that the intrinsic profile of hot gas halo is steeper than we knew previously from stacking analysis. And this kind of method is also necessary for the future research about the properties of hot gas halo outskirt.