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.
@article{arxiv.2004.05724,
title = {Discovery of Radio Jets in Phoenix Galaxy Cluster Center},
author = {Takuya Akahori and Tetsu Kitayama and Shutaro Ueda and Takuma Izumi and Kianhong Lee and Ryohei Kawabe and Kotaro Kohno and Masamune Oguri and Motokazu Takizawa},
journal= {arXiv preprint arXiv:2004.05724},
year = {2020}
}
Comments
10 pages, 5 figures, submitted in March 29 2019, accepted for publication in PASJ in April 12 2020