Unveiling the Merger Dynamics of the Sausage Cluster: A Multi-wavelength Perspective from Deep Chandra and uGMRT Observations

Majidul Rahaman^1*, Hsiang-Yi Karen Yang^1,2,3, Ramij Raja⁴

¹Institute of Astronomy, National Tsing Hua University, Hsinchu City, Taiwan
²Physics Division, National Center for Theoretical Sciences, Taipei, Taiwan
³Department of Physics, National Tsing Hua University, Hsinchu City, Taiwan
⁴Department of Physics and Electronics, Rhodes University, Makhanda, South Africa

* Presenter:Majidul Rahaman, email:rmajidul@gmail.com

In this presentation, we will showcase a comprehensive analysis of the Sausage cluster (CIZA J2242.8+5301), integrating deep Chandra X-ray observations with uGMRT sub-GHz radio data. Using 550 ks Chandra data, we constructed high-resolution thermodynamic maps that reveal detailed thermal structures, including a multiple surface brightness discontinuity. Meanwhile, uGMRT observations uncover complex radio features, such as spectral index variations and filamentary double-strand structures in the cluster's relics. A comparison between X-ray and radio brightness in the southern relic and halo highlights key interactions between thermal and non-thermal components. These combined findings provide new insights into the shock dynamics and merger history of this double-relic cluster.

Keywords: Galaxy Cluster, cluster of galaxies, X-ray astronomy, Sausage cluster, Multi-wavelength Astronomy