Contribution Invited
The Nuclear Structure in Nearby AGN at 3-500 Schwarzschild Radii Resolution
Speakers
- Dr. Tuomas SAVOLAINEN
Primary authors
- Dr. Tuomas SAVOLAINEN (Aalto Univ. & MPI für Radioastronomie)
Co-authors
- Prof. Gabriele GIOVANNINI (Bologna Univ. & IRA-INAF)
- Dr. Monica ORIENTI (IRA-INAF)
- Dr. Jeffrey HODGSON (MPI für Radioastronomie)
- Dr. Yuri Y. KOVALEV (ASC LPI & MPI für Radioastronomie)
- Dr. Gabriele BRUNI (MPI für Radioastronomie)
- Dr. Marcello GIROLETTI (IRA-INAF)
- Dr. Kazuhiro HADA (NAOJ & IRA-INAF)
- Dr. Motoki KINO (KASI)
- Dr. Thomas P. KRICHBAUM (MPI für Radioastronomie)
- Dr. Andrei P. LOBANOV (MPI für Radioastronomie)
- Dr. Sang-Sung LEE (KASI)
- Dr. Hiroshi NAGAI (NAOJ)
- Dr. Cormac REYNOLDS (ICRAR)
- Prof. Bong-Won SOHN (KASI)
- Dr. Kirill SOKOLOVSKY (ASC LPI)
- Mr. Peter VOITSIK (ASC LPI)
- Prof. J. Anton ZENSUS (MPI für Radioastronomie)
Content
The ultra-high angular resolution of RadioAstron space-VLBI observations provides an opportunity to study the relativistic jet structure in nearby radio galaxies at a spatial resolution of only a few to a few hundreds of Schwarzschild radii at centimeter wavelengths. Such observations complement the ground-based mm-VLBI experiments in probing the jet acceleration and collimation zone and offer a unique view of the internal jet structure. The RadioAstron Nearby AGN Key Science Program has carried out space-VLBI imaging of three bright, nearby radio galaxies - M87, Centaurus A and 3C84. We present here an update on the results from this program. We have successfully detected 3C84 on space baselines up to 7 Earth diameters at 6 and 1.3 cm, while M87 was detected on baselines up to 3 Earth diameters at 18 and 6 cm and up to 1 Earth diameter at 1.3 cm. The innermost parsec of the radio galaxy 3C84 has been imaged at both observing bands - with the 1.3 cm data yielding one of the highest resolution space-VLBI images ever made. We will discuss the structures visible in these images, including the jet formation site and a parsec-scale hot spot.
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