천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제44권2호
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- Pages.39.2-39.2
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- 2019
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- 1226-2692(pISSN)
Discovery of the prominent radio relics in the cluster merger ZwCL J1447+2619
- Lee, Wonki (Yonsei University) ;
- Kim, Hyeonghan (Yonsei University) ;
- Jee, Myungkook James (Yonsei University)
- 발행 : 2019.10.14
초록
Diffuse radio emissions at the outskirt of merging galaxy clusters called radio relics provide a unique channel to understand the merger history. We present a recent discovery of double radio relics in the cluster merger ZwCL1447+2619 from our recent Giant Metrewave Radio Telescope observations. Both Band 3 (300-500 MHz) and Band 4 (550-850 MHz) data reveal a large (~1Mpc) and thin (~40kpc) radio relic ~1Mpc from the cluster X-ray center and a small radio relic (~0.3 Mpc) on the opposite side. These remarkable radio data together with Subaru weak-lensing analysis and Chandra X-ray observations enable us to reconstruct the merger scenario. Our preliminary analysis suggests that the cluster ZwCL J1447+2619 is a post-merger near its returning phase. In addition, using Keck DEIMOS spectroscopy, we find many "green" and "blue" member galaxies are located between the radio relics, a possible indication of merger shock-driven star formation activities.
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