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Monitoring of the radio galaxy M 87 at Very High Energy with MAGIC during a low emission state between 2012 and 2015

Published online by Cambridge University Press:  23 June 2017

C. Arcaro ,
P. Bangale ,
M. Manganaro ,
D. Mazin ,
P. Colin ,
Ie. Vovk ,
K. Mannheim ,
K. Hada ,
H. E. Jermak  and
J. P. Madrid
...Show all authors
C. Arcaro
Affiliation:
Università di Padova and INFN, I-35131 Padova, Italy email: cornelia.arcaro@pd.infn.it
P. Bangale
Affiliation:
Max-Planck-Institut für Physik, D-80805 München, Germany
M. Manganaro
Affiliation:
Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain; Universidad de La Laguna, Dpto. Astrofísica, E-38206 La Laguna, Tenerife, Spain
D. Mazin
Affiliation:
Max-Planck-Institut für Physik, D-80805 München, Germany also at Japanese MAGIC Consortium
P. Colin
Affiliation:
Max-Planck-Institut für Physik, D-80805 München, Germany
Ie. Vovk
Affiliation:
Max-Planck-Institut für Physik, D-80805 München, Germany
K. Mannheim
Affiliation:
Universität Würzburg, D-97074, Würzburg, Germany
K. Hada
Affiliation:
Mizusawa VLBI Observatory, National Astronomical Observatory of Japan, 2-12 Hoshigaoka-cho, Mizusawa, Oshu, Iwate 023-0861, Japan
H. E. Jermak
Affiliation:
Astrophysics Research Institute, Liverpool John Moores University, Liverpool, UK
J. P. Madrid
Affiliation:
CSIRO, Astronomy and Space Science, PO Box 76, Epping NSW 1710, Australia
F. Massaro
Affiliation:
Dipartimento di Fisica, Università degli Studi di Torino, via Pietro Giuria 1, I-10125 Torino, Italy
S. Richter
Affiliation:
North-West University, Potchefstroom, South Africa
F. Spanier
Affiliation:
North-West University, Potchefstroom, South Africa
R. C. Walker
Affiliation:
National Radio Astronomy Observatory, Socorro, NM 87801, USA
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Abstract

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We present the preliminary results from observing the nearby radio galaxy M 87 for 156 hours (between the years 2012 and 2015) with the MAGIC telescopes, which lead to a significant very high energy (VHE, E > 100 GeV) detection of the source in quiescent states each year. Our VHE analysis combined with quasi-simultaneous data at other energies (from gamma-rays, X-rays, optical and radio) provides a unique opportunity to study the source variability and its broadband spectral energy distribution, which is found to disfavour a one-zone synchrotron/synchrotron self-Compton model. Therefore, other alternative scenarios for the photon emission are explored. We also find that the VHE emission is compatible with being produced close to the source radio core as previous data already indicated. A detailed paper presenting full results of the observing campaign is in preparation.

Keywords

BL Lacertae objects: individual: M 87 - galaxies: active - galaxies: jets - gamma rays: observations - radiation mechanisms: nonthermal
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S324: New Frontiers in Black Hole Astrophysics , September 2016 , pp. 164 - 167
Copyright
Copyright © International Astronomical Union 2017 

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