MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007 (original) (raw)
2012, Astronomy & Astrophysics
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Monitoring of the radio galaxy M 87 during a low-emission state from 2012 to 2015 with MAGIC
Monthly Notices of the Royal Astronomical Society
M 87 is one of the closest (z = 0.004 36) extragalactic sources emitting at very high energies (VHE, E > 100 GeV). The aim of this work is to locate the region of the VHE gamma-ray emission and to describe the observed broad-band spectral energy distribution (SED) during the low VHE gamma-ray state. The data from M 87 collected between 2012 and 2015 as part of a MAGIC monitoring programme are analysed and combined with multiwavelength data from Fermi-LAT, Chandra, HST, EVN, VLBA, and the Liverpool Telescope. The averaged VHE gamma-ray spectrum can be fitted from ∼100 GeV to ∼10 TeV with a simple power law with a photon index of (−2.41 ± 0.07), while the integral flux above 300 GeV is (1.44pm0.13)times10−12,mathrmcm−2,mathrms−1(1.44\pm 0.13)\times 10^{-12}\, \mathrm{cm}^{-2}\, \mathrm{s}^{-1}(1.44pm0.13)times10−12,mathrmcm−2,mathrms−1. During the campaign between 2012 and 2015, M 87 is generally found in a low-emission state at all observed wavelengths. The VHE gamma-ray flux from the present 2012–2015M 87 campaign is consistent with a constant flux with some hin...
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