Oral Presentation
Very High Energy monitoring of the radio galaxy M87 with MAGIC during a low emission state between 2012 and 2015
Presenter: Daniel Mazin (ICRR, University of Tokyo)
For more than 10 years M87 has been monitored in the very high energy gamma-ray band (VHE, E > 100 GeV) by the imaging atmospheric Cherenkov telescopes MAGIC, H.E.S.S and VERITAS. The time correlation between the TeV flux and the emission at different wavelengths provides a unique opportunity to localize the VHE emission process occurring in its active galactic nucleus. In 2005, 2008 and 2010, M87 underwent several periods of high TeV activities, and rapid flares with short timescale variability were detected. MAGIC continued to monitor M87 but no major flares were detected since 2010. From 2012-2015, we have collected ~156 hrs of data with MAGIC, resulting in a significant detection of the source in quiescent state in each year. Here we present the VHE gamma-ray spectrum in low emission state measured by MAGIC up to ~10 TeV together with the quasi-simultaneous multiwavelength data in gamma rays, X-rays, optical and radio bands.
We discuss the VHE gamma-ray variability, the modeling of the broad band energy spectrum and the location of the gamma-ray emission region.
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