Oral Presentation

Birth of Radio Activity in a Quasar

Author(s): Satoki Matsushita (ASIAA), Kaiki Taro Inoue (Kindai Univ.), Kouichiro Nakanishi (NAOJ), Takeo Minezaki (Univ. Tokyo)

Presenter: Satoki Matsushita (ASIAA)

Many AGNs show radio activities, but not clear how the activities start. So far, the Gigahertz Peaked-Spectrum (GPS) sources and/or the Compact Steep-Spectrum (CSS) sources are consider to be in the early phase of the radio activities. However, most of these sources are compact, but located at high-z universe, so that the best way to study is to observe the gavitationally lensed system of such sources. We observed MG J0414+0534, which is a quadruply lensed GPS QSO located at z = 2.639, with the ALMA Band 9 long baseline configuration. Both continuum and CO(11-10) have been detected, and the de-lensed image reached to 50 pc resolution. It shows the jet-ISM interaction within the scale of 1 kpc. In this presentation, we will discuss the evolution of radio activity in this QSO system.