Resolving high-z Galaxy Cluster properties through joint X-ray and Millimeter analysis: a case study of SPT-CLJ0615-5746 ...

• Main Authors: Mastromarino, Claudio, Oppizzi, Filippo, De Luca, Federico, Bourdin, Hervé, Mazzotta, Pasquale
• Format: Report
• Language: unknown
• Published: arXiv 2024
• Subjects: Astrophysics of Galaxies astro-ph.GA; FOS Physical sciences; South Pole; South pole
• Online Access: https://dx.doi.org/10.48550/arxiv.2401.17363; https://arxiv.org/abs/2401.17363

We present a joint millimetric and X-ray analysis of hot gas properties in the distant galaxy cluster SPT-CLJ0615-5746 ($z = 0.972$). Combining Chandra observations with the South Pole Telescope (SPT) and Planck data, we perform radial measurements of thermodynamical quantities up to a characteristic radius of $1.2\, R_{500}$. We exploit the high angular resolution of Chandra and SPT to map the innermost region of the cluster and the high sensitivity to the larger angular scales of Planck to constrain the outskirts and improve the estimation of the cosmic microwave background and the galactic thermal dust emissions. Besides maximizing the accuracy of radial temperature measurements, our joint analysis allows us to test the consistency between X-ray and millimetric derivations of thermodynamic quantities via the introduction of a normalization parameter ($η_T$) between X-ray and millimetric temperature profiles. This approach reveals a substantial high value of the normalization parameter, ... : 13 pages and 10 figures ...