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Artículo

Microvariability in AGNs: study of different statistical methods. I. Observational Analysis

Zibecchi, Lorena CeciliaIcon ; Andruchow, IleanaIcon ; Cellone, Sergio AldoIcon ; Carpintero, Daniel DiegoIcon ; Romero, Gustavo EstebanIcon ; Combi, Jorge ArielIcon
Fecha de publicación: 01/2017
Editorial: Wiley Blackwell Publishing, Inc
Revista: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

We present the results of a study of different statistical methods currently used in the literature to analyse the (micro)variability of active galactic nuclei (AGNs) from ground-based optical observations. In particular, we focus on the comparison between the results obtained by applying the so-called C and F statistics, which are based on the ratio of standard deviations and variances, respectively. The motivation for this is that the implementation of these methods leads to different and contradictory results, making the variability classification of the light curves of a certain source dependent on the statistics implemented.<br />For this purpose, we re-analyse the results on an AGN sample observed along several sessions with the 2.15-m ?Jorge Sahade? telescope (CASLEO), San Juan, Argentina. For each AGN we constructed the nightly differential light curves. We thus obtained a total of 78 light curves for 39 AGNs, and we then applied the statistical tests mentioned above, in order to re-classify the variability state of these light curves and in an attempt to find the suitable statistical methodology to study photometric (micro)variations. We conclude that, although the C criterion is not proper a statistical test, it could still be a suitable parameter to detect variability and that its application allows to get more reliable variability results, in contrast with the F test.
Palabras clave: Galaxies: Active , Techniques: Photometry , Methods: Statistical
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/64567
URL: https://academic.oup.com/mnras/article/467/1/340/2896675
DOI: https://doi.org/10.1093/mnras/stx054
Colecciones
Articulos(CASLEO)
Articulos de COMPLEJO ASTRONOMICO "EL LEONCITO"
Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Articulos(IAR)
Articulos de INST.ARG.DE RADIOASTRONOMIA (I)
Citación
Zibecchi, Lorena Cecilia; Andruchow, Ileana; Cellone, Sergio Aldo; Carpintero, Daniel Diego; Romero, Gustavo Esteban; et al.; Microvariability in AGNs: study of different statistical methods. I. Observational Analysis; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 467; 1; 1-2017; 340-352
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