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The jet in M87 from e-EVN observations

Published online by Cambridge University Press:  24 February 2011

G. Giovannini ,
C. Casadio ,
M. Giroletti ,
M. Beilicke ,
A. Cesarini  and
H. Krawczynski
G. Giovannini
Affiliation:
Istituto di Radioastronomia-INAF, via Gobetti 101, 40129 Bologna, Italy email: [email protected] Dipartimento di Astronomia, via Ranzani 1, 40127 Bologna, Italy
C. Casadio
Affiliation:
Istituto di Radioastronomia-INAF, via Gobetti 101, 40129 Bologna, Italy email: [email protected]
M. Giroletti
Affiliation:
Istituto di Radioastronomia-INAF, via Gobetti 101, 40129 Bologna, Italy email: [email protected]
M. Beilicke
Affiliation:
Department of Physics, Washington University, St. Louis, MO 63130, USA
A. Cesarini
Affiliation:
School of Physics, National University of Ireland Galway, University Road, Galway, Republic of Ireland
H. Krawczynski
Affiliation:
Department of Physics, Washington University, St. Louis, MO 63130, USA
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Abstract

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One of the most intriguing open questions of today's astrophysics is the jet physical properties and the location and the mechanisms for the production of MeV, GeV, and TeV gamma-rays in AGN jets. M87 is a privileged laboratory for a detailed study of the properties of jets, owing to its proximity, its massive black hole, and its conspicuous emission at radio wavelengths and above. We started on November 2009 a monitoring program with the e-EVN at 5 GHz. We present here results of these multi-epoch observations and discuss the two episodes of activity at energy E>100 GeV that occured in this period. One of these observations was obtained at the same day of the first high energy flare. We added to our results literature data obtained with the VLBI and VLA. A clear change in the proper motion velocity of HST-1 is present at the epoch ~2005.5. In the time range 1998 – 2005.5 the apparent velocity is subluminal, and superluminal (~2.7c) after 2005.5.

Keywords

Galaxies: jetsGalaxies: M87Galaxies: active
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S275: Jets at all Scales , September 2010 , pp. 150 - 154
Copyright
Copyright © International Astronomical Union 2011

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