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Título:
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MAGIC detection of short-term variability of the high-peaked BL Lac object lES 0806+524
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Autores:
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Antoranz Canales, Pedro ;
Barrio Uña, Juan Abel ;
Contreras González, José Luis ;
Fonseca González, Mª Victoria ;
López Moya, Marcos ;
Miranda Pantoja, José Miguel ;
Satalecka, Konstanzja ;
Scapin, Valeria
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Tipo de documento:
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texto impreso
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Editorial:
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Oxford University Press, 2015-07-21
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Electricidad
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Materia = Ciencias: Física: Electrónica
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Tipo = Artículo
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Resumen:
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The high-frequency-peaked BL Lac (HBL) 1ES 0806+524 (z = 0.138) was discovered in VHE ? rays in 2008. Until now, the broad-band spectrum of 1ES 0806+524 has been only poorly characterized, in particular at high energies. We analysed multiwavelength observations from ? rays to radio performed from 2011 January to March, which were triggered by the high activity detected at optical frequencies. These observations constitute the most precise determination of the broad-band emission of 1ES 0806+524 to date. The stereoscopic MAGIC observations yielded a ?-ray signal above 250 GeV of (3.7 ± 0.7) per cent of the Crab Nebula flux with a statistical significance of 9.9?. The multiwavelength observations showed significant variability in essentially all energy bands, including a VHE ?-ray flare that lasted less than one night, which provided unprecedented evidence for short-term variability in 1ES 0806+524. The spectrum of this flare is well described by a power law with a photon index of 2.97 ± 0.29 between ?150 GeV and 1 TeV and an integral flux of (9.3±1.9) per cent of the Crab Nebula flux above 250 GeV. The spectrum during the non-flaring VHE activity is compatible with the only available VHE observation performed in 2008 with VERITAS when the source was in a low optical state. The broad-band spectral energy distribution can be
described with a one-zone Synchrotron Self Compton model with parameters typical for HBLs, indicating that 1ES 0806+524 is not substantially different from the HBLs previously detected.
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En línea:
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https://eprints.ucm.es/33789/1/MirandaJM135preprint.pdf
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