X-ray characterisation of the massive galaxy cluster ClG J104803.7+313843 at z=0.76 with XMM-Newton

We present the characterisation of massive cluster ClG J104803.7+313843 at z = 0.76 performed using a serendipitous XMM-Newton observation. High redshift and objects represent an ideal laboratory to benchmark our understanding how clusters form assembly formation is mainly driven by gravity. Leveraging high throughput we were firstly able determine object, shedding light on ambiguous photometric associations. investigated morphology this which shows signs merging activities in outskirts flat core. also measured radial density profile up R500. With these quantities hand, mass, M500 5.64−0.62+0.79 × 1014 M⊙, YX proxy. This quantity improves previous measurement mass object factor ∼3.5. The one such regime fundamental as are intrinsically rare, with number discovered so far being less than ∼25. Our study highlights importance X-ray observations combination ancillary multi-wavelength data improve high-z clusters.