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Title:
A wide and collimated radio jet in 3C84 on the scale of a few hundred gravitational radii
Authors:
Giovannini, G.; Savolainen, T.; Orienti, M.; Nakamura, M.; Nagai, H.; Kino, M.; Giroletti, M.; Hada, K.; Bruni, G.; Kovalev, Y. Y.; Anderson, J. M.; D'Ammando, F.; Hodgson, J.; Honma, M.; Krichbaum, T. P.; Lee, S.-S.; Lico, R.; Lisakov, M. M.; Lobanov, A. P.; Petrov, L.; Sohn, B. W.; Sokolovsky, K. V.; Voitsik, P. A.; Zensus, J. A.; Tingay, S.
Affiliation:
AA(Dipartimento di Fisica e Astronomia, Università di Bologna, Bologna, Italy; Istituto di Radio Astronomia, INAF, Bologna, Italy 0000-0003-4916-6362), AB(Aalto University Department of Electronics and Nanoengineering, Espoo, Finland; Aalto University Metsähovi Radio Observatory, Kylmälä, Finland; Max-Planck-Institut für Radioastronomie, Bonn, Germany 0000-0001-6214-1085), AC(Istituto di Radio Astronomia, INAF, Bologna, Italy), AD(Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan), AE(National Astronomical Observatory of Japan, Osawa, Tokyo, Japan), AF(Kogakuin University, Academic Support Center, Tokyo, Japan; Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Tokyo, Japan), AG(Istituto di Radio Astronomia, INAF, Bologna, Italy 0000-0002-8657-8852), AH(Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Tokyo, Japan), AI(Istituto di Radio Astronomia, INAF, Bologna, Italy; Max-Planck-Institut für Radioastronomie, Bonn, Germany; Istituto di Astrofisica e Planetologia Spaziali, INAF, Roma, Italy 0000-0002-5182-6289), AJ(Max-Planck-Institut für Radioastronomie, Bonn, Germany; Astro Space Center of Lebedev Physical Institute, Moscow, Russia; Moscow Institute of Physics and Technology, Moscow, Russia 0000-0001-9303-3263), AK(Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam, Germany 0000-0002-5989-8498), AL(Dipartimento di Fisica e Astronomia, Università di Bologna, Bologna, Italy; Istituto di Radio Astronomia, INAF, Bologna, Italy), AM(Korea Astronomy and Space Science Institute, Yuseong-gu, Daejeon, Korea), AN(Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Tokyo, Japan), AO(Max-Planck-Institut für Radioastronomie, Bonn, Germany), AP(Korea Astronomy and Space Science Institute, Yuseong-gu, Daejeon, Korea; Korea University of Science and Technology, Yuseong-gu, Daejeon, Korea), AQ(Dipartimento di Fisica e Astronomia, Università di Bologna, Bologna, Italy; Istituto di Radio Astronomia, INAF, Bologna, Italy), AR(Astro Space Center of Lebedev Physical Institute, Moscow, Russia), AS(Max-Planck-Institut für Radioastronomie, Bonn, Germany), AT(Moscow Institute of Physics and Technology, Moscow, Russia; Astrogeo Center, Falls Church, VA, USA), AU(Korea Astronomy and Space Science Institute, Yuseong-gu, Daejeon, Korea; Korea University of Science and Technology, Yuseong-gu, Daejeon, Korea; Department of Astronomy, Yonsei University, Seoul, Korea), AV(Astro Space Center of Lebedev Physical Institute, Moscow, Russia; IAASARS, National Observatory of Athens, Penteli, Greece; Sternberg Astronomical Institute, Moscow State University, Moscow, Russia), AW(Astro Space Center of Lebedev Physical Institute, Moscow, Russia), AX(Max-Planck-Institut für Radioastronomie, Bonn, Germany), AY(Curtin Institute of Radio Astronomy, Curtin University, Bentley, Australia)
Publication:
Nature Astronomy, Volume 2, p. 472-477
Publication Date:
06/2018
Origin:
NATURE
Abstract Copyright:
2018: The Author(s)
DOI:
10.1038/s41550-018-0431-2
Bibliographic Code:
2018NatAs...2..472G

Abstract

Understanding the formation of relativistic jets in active galactic nuclei remains an elusive problem1. This is partly because observational tests of jet formation models suffer from the limited angular resolution of ground-based very-long-baseline interferometry that has thus far been able to probe the structure of the jet acceleration and collimation region in only two sources2,3. Here, we report observations of 3C84 (NGC 1275)---the central galaxy of the Perseus cluster---made with an interferometric array including the orbiting radio telescope of the RadioAstron4 mission. The data transversely resolve the edge-brightened jet in 3C84 only 30 muas from the core, which is ten times closer to the central engine than was possible in previous ground-based observations5 and allows us to measure the jet collimation profile from 102 to 104 gravitational radii (rg) from the black hole. The previously found5, almost cylindrical jet profile on scales larger than a few thousand rg is seen to continue at least down to a few hundred rg from the black hole, and we find a broad jet with a transverse radius of ≳250 rg at only 350 rg from the core. This implies that either the bright outer jet layer goes through a very rapid lateral expansion on scales ≲102 rg or it is launched from the accretion disk.
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