Miniatura

Fitxers

617035.pdf (169.82 KB)

Tipus de document

Article

Versió

Versió publicada

Data de publicació

2012

Tots els drets reservats

Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/151160

MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007

Títol de la revista

Autors

Director/Tutor

ISSN de la revista

Títol del volum

Recurs relacionat

https://doi.org/10.1051/0004-6361/201117827

Resum

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.

Matèries

Astronomia de raigs gamma, Observacions astronòmiques

Matèries (anglès)

Gamma ray astronomy, Astronomical observations

Citació

Col·leccions

Articles publicats en revistes (Física Quàntica i Astrofísica)

Citació

MAGIC Collaboration, MUNAR I ADROVER, Pere, PAREDES I POY, Josep maria, RIBÓ GOMIS, Marc, MOLDÓN VARA, Francisco javier. MAGIC observations of the giant radio galaxy M 87 in a low-emission state between 2005 and 2007. _Astronomy & Astrophysics_. 2012. Vol. 544, núm. A96. [consulta: 27 de gener de 2026]. ISSN: 0004-6361. [Disponible a: https://hdl.handle.net/2445/151160]

Exportar metadades

JSON - METS

Compartir registre