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Title:
A strong radio brightening at the jet base of M87 during the elevated very-high-energy gamma-ray state in 2012
Authors:
Hada, K.; Giroletti, M.; Kino, M.; Giovannini, G.; Ammando, F. D'; Cheung, C. C.; Beilicke, M.; Nagai, H.; Doi, A.; Akiyama, K.; Honma, M.; Niinuma, K.; Casadio, C.; Orienti, M.; Krawczynski, H.; Gómez, J. L.; Sawada-Satoh, S.; Koyama, S.; Cesarini, A.; Nakahara, S.; Gurwell, M. A.
Affiliation:
AA(INAF Istituto di Radioastronomia, via Gobetti 101, I-40129 Bologna, Italy ), AB(INAF Istituto di Radioastronomia, via Gobetti 101, I-40129 Bologna, Italy ), AC(Korea Astronomy and Space Science Institute, 776 Daedukdae-ro, Yusong, Daejon 305-348, Korea), AD(INAF Istituto di Radioastronomia, via Gobetti 101, I-40129 Bologna, Italy ), AE(INAF Istituto di Radioastronomia, via Gobetti 101, I-40129 Bologna, Italy ), AF(Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA), AG(Physics Department and McDonnell Center for the Space Sciences, Washington University, St. Louis, MO 63130, USA), AH(Physics Department and McDonnell Center for the Space Sciences, Washington University, St. Louis, MO 63130, USA), AI(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo, Sagamihara 252-5210, Japan), AJ(Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588, Japan), AK(Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588, Japan), AL(Department of Astronomical Science, The Graduate University for Advanced Studies (SOKENDAI), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan), AM(Instituto de Astrofisica de Andalucia, CSIC, Apartado 3004, 18080 Granada, Spain), AN(INAF Istituto di Radioastronomia, via Gobetti 101, I-40129 Bologna, Italy ), AO(Physics Department and McDonnell Center for the Space Sciences, Washington University, St. Louis, MO 63130, USA), AP(Instituto de Astrofisica de Andalucia, CSIC, Apartado 3004, 18080 Granada, Spain), AQ(Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588, Japan), AR(Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588, Japan), AS(Department of Physics, University of Trento, I38050, Povo, Trento, Italy), AT(Faculty of Science, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan), AU(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA)
Publication:
Extragalactic jets from every angle, Proceedings of the International Astronomical Union, IAU Symposium, Volume 313, pp. 340-345
Publication Date:
03/2015
Origin:
CUP
Keywords:
galaxies: active, galaxies: individual (M87), galaxies: jets,
Abstract Copyright:
(c) 2015: Copyright © International Astronomical Union 2015
DOI:
10.1017/S174392131500246X
Bibliographic Code:
2015IAUS..313..340H

Abstract

The nearby radio galaxy M87 offers a unique opportunity for exploring the connection between gamma-ray production and jet formation at an unprecedented linear resolution. However, the origin and location of the gamma-rays in this source is still elusive. Based on previous radio/TeV correlation events, the unresolved jet base (radio core) and the peculiar knot HST-1 at >120 pc from the nucleus are proposed as candidate site(s) of gamma-ray production. Here we report our intensive, high-resolution radio monitoring observations of the M87 jet with the VLBI Exploration of Radio Astrometry (VERA) and the European VLBI Network (EVN) from February 2011 to October 2012. During this period, an elevated level of the M87 flux is reported at TeV with VERITAS. We detected a remarkable flux increase in the radio core with VERA at 22/43 GHz coincident with the VHE activity. Meanwhile, HST-1 remained quiescent in terms of its flux density and structure at radio. These results strongly suggest that the TeV gamma-ray activity in 2012 originates in the jet base within 0.03 pc (projected) from the central supermassive black hole.
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