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Evidence for nuclear radio jet and its structure down to <100 Schwarzschild radii in the center of the Sombrero galaxy (M 104, NGC 4594)
Kazuhiro Hada, Akihiro Doi, Hiroshi Nagai +4
Abridged: We investigated the detailed radio structure of the nucleus of the Sombrero galaxy using high-resolution, quasi-simultaneous, multi-frequency, phase-referencing VLBA obse…
Innermost collimation structure of the M87 jet down to ~ten Schwarzschild radii
Kazuhiro Hada, Motoki Kino, Akihiro Doi +6
We investigated the detailed inner jet structure of M87 using the Very Long Baseline Array data at 2, 5, 8.4, 15, 23.8, 43, and 86 GHz, especially focusing on the multi-frequency p…
The kinematic of HST-1 in the jet of M87
M. Giroletti, K. Hada, G. Giovannini +9
Aims: We aim to constrain the structural variations within the HST-1 region downstream of the radio jet of M87, in general as well as in connection to the episodes of activity at v…
The 2010 very high energy gamma-ray flare & 10 years of multi-wavelength observations of M 87
The H. E. S. S. Collaboration, :, A. Abramowski +442
Abridged: The giant radio galaxy M 87 with its proximity, famous jet, and very massive black hole provides a unique opportunity to investigate the origin of very high energy (VHE;…
Nuclear Radio Continuum Emission of Low-Luminosity Active Galactic Nucleus NGC 4258
Akihiro Doi, Kotaro Kohno, Kouichiro Nakanishi +4
The nearby low-luminosity active galactic nucleus (LLAGN) NGC 4258 has a weak radio continuum emission at the galactic center. Quasi-simultaneous multi-frequency observations using…