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Title:
Multi-frequency, multi-epoch VLBI observations of the M87 jet
Authors:
Hada, Kazuhiro; Giroletti, Marcello; Giovannini, Gabriele; Doi, Akihiro; Kino, Motoki; Nagai, Hiroshi; Honma, Mareki; Kawaguchi, Noriyuki
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(INAF Istituto di Radioastronomia, via Gobetti 101, I-40129 Bologna, Italy), AD(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo, Sagamihara 252-5210, Japan), AE(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo, Sagamihara 252-5210, Japan), AF(National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588, Japan), AG(National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588, Japan), AH(National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588, Japan)
Publication:
Multiwavelength AGN Surveys and Studies, Proceedings of the International Astronomical Union, IAU Symposium, Volume 304, pp. 106-107
Publication Date:
07/2014
Origin:
CUP
Keywords:
instrumentation: high angular resolution, techniques: interferometric, galaxies: active, galaxies: jets,
Abstract Copyright:
(c) 2014: Copyright © International Astronomical Union 2014
DOI:
10.1017/S1743921314003482
Bibliographic Code:
2014IAUS..304..106H

Abstract

We present some of preliminary results obtained by our dense monitoring project of the M87 jet with VERA 22 and 43 GHz starting from October 2010. The aims of this monitor are to clarify the detailed physical properties of the M87 jet base near the black hole, including the connection to gamma-ray productions, jet kinematics and nuclear opacity. We detected a remarkable increase of the radio flux from the jet base of M87 during an elevated very-high-energy gamma-ray activity occurred in the early 2012, suggesting that the gamma-ray is produced in the immediate vicinity of the central black hole.
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