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Millimeter-VLBI Observations of Low-luminosity Active Galactic Nuclei with Source-frequency Phase Referencing

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Millimeter-VLBI Observations of Low-luminosity Active Galactic Nuclei with Source-frequency Phase Referencing

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Jiang, Wu; Shen, Zhiqiang; Martí Vidal, Iván; Wang, Xuezheng; Jiang, Dongrong; Kawaguchi, Noriyuki

Aquest document és un/a article, creat/da en: 2021

We report millimeter-VLBI results of low-luminosity active galactic nuclei (M84 and M87) up to 88 GHz with source-frequency phase-referencing observations. We detected the weak VLBI core and obtained the first image of M84 at 88 GHz. The derived brightness temperature of the M84 core was about 7.2 × 109 K, which could serve as a lower limit because the core down to 30 Schwarzschild radii was still unresolved in our 88 GHz observations. We successfully determined the core shifts of M87 at 22-44 GHz and 44-88 GHz through the source-frequency phase-referencing technique. The jet apex of M87 could be deduced at ~46 μas upstream of the 43 GHz core from core-shift measurements. The estimated magnetic field strength of the 88 GHz core of M87 is 4.8 ± 2.4 G, which is at the same magnitude of 1-30 G near the event horizon probed by the Event Horizon Telescope.

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