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Title: MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007
Author: MAGIC Collaboration
Munar i Adrover, Pere
Paredes i Poy, Josep Maria
Ribó Gomis, Marc
Moldón Vara, Francisco Javier
Keywords: Astronomia de raigs gamma
Observacions astronòmiques
Gamma ray astronomy
Astronomical observations
Issue Date: 2012
Publisher: EDP Sciences
Abstract: Context. We present the results of a long M 87 monitoring campaign in very high energy γ-rays with the MAGIC-I Cherenkov telescope. Aims. We aim to model the persistent non-thermal jet emission by monitoring and characterizing the very high energy γ-ray emission of M 87 during a low state. Methods. A total of 150 h of data were taken between 2005 and 2007 with the single MAGIC-I telescope, out of which 128.6 h survived the data quality selection. We also collected data in the X-ray and Fermi-LAT bands from the literature (partially contemporaneous). Results. No flaring activity was found during the campaign. The source was found to be in a persistent low-emission state, which was at a confidence level of 7σ. We present the spectrum between 100 GeV and 2 TeV, which is consistent with a simple power law with a photon index Γ = 2.21 ± 0.21 and a flux normalization at 300 GeV of (7.7 ± 1.3) × 10-8 TeV-1 s-1 m-2. The extrapolation of the MAGIC spectrum into the GeV energy range matches the previously published Fermi-LAT spectrum well, covering a combined energy range of four orders of magnitude with the same spectral index. We model the broad band energy spectrum with a spine layer model, which can satisfactorily describe our data.
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It is part of: Astronomy & Astrophysics, 2012, vol. 544, num. A96
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ISSN: 0004-6361
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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