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Multi-frequency, multi-epoch VLBI observations of the M87 jet

Published online by Cambridge University Press:  25 July 2014

Kazuhiro Hada ,
Marcello Giroletti ,
Gabriele Giovannini ,
Akihiro Doi ,
Motoki Kino ,
Hiroshi Nagai ,
Mareki Honma  and
Noriyuki Kawaguchi
Kazuhiro Hada
Affiliation:
INAF Istituto di Radioastronomia, via Gobetti 101, I-40129 Bologna, Italy email: [email protected] National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588, Japan
Marcello Giroletti
Affiliation:
INAF Istituto di Radioastronomia, via Gobetti 101, I-40129 Bologna, Italy email: [email protected]
Gabriele Giovannini
Affiliation:
INAF Istituto di Radioastronomia, via Gobetti 101, I-40129 Bologna, Italy email: [email protected] Dipartimento di Astronomia, Università di Bologna, via Ranzani 1, I-40127 Bologna, Italy
Akihiro Doi
Affiliation:
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo, Sagamihara 252-5210, Japan
Motoki Kino
Affiliation:
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo, Sagamihara 252-5210, Japan
Hiroshi Nagai
Affiliation:
National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588, Japan
Mareki Honma
Affiliation:
National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588, Japan Department of Astronomical Science, The Graduate University for Advanced Studies (SOKENDAI), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Noriyuki Kawaguchi
Affiliation:
National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo 181-8588, Japan
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Abstract

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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 γ-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 γ-ray activity occurred in the early 2012, suggesting that the γ-ray is produced in the immediate vicinity of the central black hole.

Keywords

instrumentation: high angular resolutiontechniques: interferometricgalaxies: activegalaxies: jets
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S304: Multiwavelength AGN Surveys and Studies , October 2013 , pp. 106 - 107
Copyright
Copyright © International Astronomical Union 2014 

References

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