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http://hdl.handle.net/2445/151160
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. |
Note: | Reproducció del document publicat a: https://doi.org/10.1051/0004-6361/201117827 |
It is part of: | Astronomy & Astrophysics, 2012, vol. 544, num. A96 |
URI: | http://hdl.handle.net/2445/151160 |
Related resource: | https://doi.org/10.1051/0004-6361/201117827 |
ISSN: | 0004-6361 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
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