Discovery of Radio Jets in Phoenix Galaxy Cluster Center
| Autor: | Akahori, Takuya, Kitayama, Tetsu, Ueda, Shutaro, Izumi, Takuma, Lee, Kianhong, Kawabe, Ryohei, Kohno, Kotaro, Oguri, Masamune, Takizawa, Motokazu |
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| Rok vydání: | 2020 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/pasj/psaa039 |
| Popis: | We report the results of the Australia Telescope Compact Array (ATCA) 15 mm observation of the Phoenix galaxy cluster possessing an extreme star-burst brightest cluster galaxy (BCG) at the cluster center. We spatially resolved radio emission around the BCG, and found diffuse bipolar and bar-shape structures extending from the active galactic nucleus (AGN) of the BCG. They are likely radio jets/lobes, whose sizes are ~10-20 kpc and locations are aligned with X-ray cavities. If we assume that the radio jets/lobes expand with the sound velocity, their ages are estimated to be ~10 Myr. We also found compact radio emissions near the center and suggest that they are another young bipolar jets with ~1 Myr of age. Moreover, we found extended radio emission surrounding the AGN and discussed the possibility that the component is a product of the cooling flow, by considering synchrotron radiation partially absorbed by molecular clumps, free-free emission from the warm ionized gas, and the spinning dust emission from dusty circum-galactic medium. Comment: 10 pages, 5 figures, submitted in March 29 2019, accepted for publication in PASJ in April 12 2020 |
| Databáze: | arXiv |
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