VERA monitoring of the radio jet 3C 84 during 2007--2013: detection of   non-linear motion

Koichiro Hiura (1); Hiroshi Nagai (2); Motoki Kino (2; 3); Kotaro; Niinuma (4); Kazuo Sorai (1; 5; 6; 7); Hikaru Chida (8); Kazunori Akiyama; (9; 10; 2); Filippo D'Ammando (11; 12); Gabriele Giovannini (11 and; 12); Marcello Giroletti (11); Kazuhiro Hada (2; 13); Mareki Honma (2 and; 13); Shoko Koyama (14); Monica Orienti (11); Gabor Orosz (15; 16) and; Satoko Sawada-Satoh (15) ((1) Department of Cosmosciences; Graduate School of; Science; Hokkaido University; (2) National Astronomical Observatory of Japan,; (3) Kogakuin University; Academic Support Center; (4) Graduate School of; Sciences; Technology for Innovation; Yamaguchi University; (5) Department; of Physics; Faculty of Science; Hokkaido University; (6) Division of Physics,; Faculty of Pure; Applied Sciences; University of Tsukuba; (7) Tomonaga; Center for the History of the Universe (TCHoU); University of Tsukuba; (8); Department of Physics; Tokai University; (9) National Radio Astronomy; Observatory; (10) Massachusetts Institute of Technology; Haystack; Observatory; (11) INAF Istituto di Radioastronomia; (12) Dipartimento di; Fisica e Astronomia; Universita di Bologna; (13) Department of Astronomical; Science; The Graduate University for Advanced Studies (SOKENDAI); (14); Institute of Astronomy; Astrophysics; Academia Sinica; (15) Graduate; School of Science; Engineering; Kagoshima University; (16) Xinjiang; Astronomical Observatory; Chinese Academy of Sciences)

arXiv:1806.05302·astro-ph.GA·August 1, 2018

VERA monitoring of the radio jet 3C 84 during 2007--2013: detection of non-linear motion

Koichiro Hiura (1), Hiroshi Nagai (2), Motoki Kino (2, 3), Kotaro, Niinuma (4), Kazuo Sorai (1, 5, 6, 7), Hikaru Chida (8), Kazunori Akiyama, (9, 10, 2), Filippo D'Ammando (11, 12), Gabriele Giovannini (11 and, 12), Marcello Giroletti (11), Kazuhiro Hada (2, 13)

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TL;DR

This study tracks the radio jet in galaxy 3C 84 over six years, revealing a steady outward motion and a non-linear component, providing insights into jet dynamics and mini-lobe evolution.

Contribution

First detailed VLBI kinematic analysis of 3C 84's jet showing constant velocity and non-linear motion components.

Findings

01

Average velocity of 0.27c for component C3

02

Detection of non-linear motion in C3

03

Implications for jet and mini-lobe dynamics

Abstract

We present a kinematic study of the subparsec-scale radio jet of the radio galaxy 3C 84/NGC 1275 with the VLBI Exploration of Radio Astrometry (VERA) array at 22 GHz for 80 epochs from 2007 October to 2013 December. The averaged radial velocity of the bright component "C3" with reference to the radio core is found to be $0.27 p m 0.02 c$ between 2007 October and 2013 December. This constant velocity of C3 is naturally explained by the advancing motion of the head of the mini-radio lobe. We also find a non-linear component in the motion of C3 with respect to the radio core. We briefly discuss possible origins of this non-linear motion.

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