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Título:
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Systematic Search for ?-Ray Periodicity in Active Galactic Nuclei Detected by the Fermi Large Area Telescope
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Autores:
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Peñil del Campo, Pablo ;
Dominguez, A. ;
Buson, S. ;
Ajello, M. ;
Otero Santos, J. ;
Barrio Uña, Juan Abel ;
Nemmen, R. ;
Cutini, S. ;
Rani, B. ;
Franckowiak, A. ;
Cavazzuti, E.
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Tipo de documento:
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texto impreso
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Editorial:
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American Astronomical Society, 2020-06
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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: Física nuclear
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Tipo = Artículo
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Resumen:
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We use nine years of gamma-ray data provided by the Fermi Large Area Telescope (LAT) to systematically study the light curves (LCs) of more than 2000 active galactic nuclei (AGN) included in recent Fermi-LAT catalogs. Ten different techniques are used, which are organized in an automatic periodicity-search pipeline, in order to search for evidence of periodic emission in gamma rays. Understanding the processes behind this puzzling phenomenon will provide a better view about the astrophysical nature of these extragalactic sources. However, the observation of temporal patterns in gamma-ray LCs of AGN is still challenging. Despite the fact that there have been efforts to characterize the temporal emission of some individual sources, a systematic search for periodicities by means of a full likelihood analysis applied to large samples of sources was missing. Our analysis finds 11 AGN, of which 9 are identified for the first time, showing periodicity at more than 4 sigma in at least four algorithms. These findings will help in solving questions related to the astrophysical origin of this periodic behavior.
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En línea:
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https://eprints.ucm.es/id/eprint/61653/1/BarrioU%C3%B1a13preprint.pdf
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