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Discovery of a radio jet in the Cloverleaf quasar at z = 2.56

2023; Oxford University Press; Volume: 524; Issue: 3 Linguagem: Inglês

10.1093/mnras/stad2069

1365-2966

Lei Zhang, Zhi-Yu Zhang, J. W. Nightingale, Ze-Cheng Zou, Xiaoyue Cao, Chao‐Wei Tsai, C. Yang, Yong Shi, Junzhi Wang, Dandan Xu, Lingrui Lin, Jing Zhou, Ran Li,

Radio Astronomy Observations and Technology

The fast growth of supermassive black holes and their feedback to the host galaxies play an important role in regulating the evolution of galaxies, especially in the early Universe. However, due to cosmological dimming and the limited angular resolution of most observations, it is difficult to resolve the feedback from the active galactic nuclei (AGN) to their host galaxies. Gravitational lensing, for its magnification, provides a powerful tool to spatially differentiate emission originated from AGN and host galaxy at high redshifts. Here we report a discovery of a radio lobe in a strongly lensed starburst quasar, H1413+117 or Cloverleaf at redshift $z= 2.56$, based on observational data at optical, sub-millimetre, and radio wavelengths. With both parametric and non-parametric lens models and with reconstructed images on the source plane, we find a differentially lensed, kpc scaled, single-sided radio lobe, located at ${\sim}1.2\,\mathrm{kpc}$ to the north west of the host galaxy on the source plane. From the spectral energy distribution in radio bands, we find that the radio lobe has an energy turning point residing between 1.5 GHz and 8 GHz, indicating an age of 20--50 Myr. This could indicate a feedback switching of Cloverleaf quasar from the jet mode to the quasar mode.