Micro variability in AGNs: study of different statistical methods: I. Observational analysis

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-cal...

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Detalles Bibliográficos
Autores principales: Zibecchi, Lorena, Andruchow, Ileana, Cellone, Sergio Aldo, Carpintero, Daniel Diego, Romero, Gustavo Esteban, Combi, Jorge Ariel
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 2017
Materias:
Ciencias Astronómicas
methods: statistical
galaxies: active
techniques: photometric
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82331
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82331
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
methods: statistical
galaxies: active
techniques: photometric
spellingShingle Ciencias Astronómicas
methods: statistical
galaxies: active
techniques: photometric
Zibecchi, Lorena
Andruchow, Ileana
Cellone, Sergio Aldo
Carpintero, Daniel Diego
Romero, Gustavo Esteban
Combi, Jorge Ariel
Micro variability in AGNs: study of different statistical methods: I. Observational analysis
topic_facet Ciencias Astronómicas
methods: statistical
galaxies: active
techniques: photometric
description 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. For this purpose, we re-analyse the results on an AGN sample observed along several sessions with the 2.15m ‘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 us to get more reliable variability results, in contrast with the F test.
format Articulo
Preprint
author Zibecchi, Lorena
Andruchow, Ileana
Cellone, Sergio Aldo
Carpintero, Daniel Diego
Romero, Gustavo Esteban
Combi, Jorge Ariel
author_facet Zibecchi, Lorena
Andruchow, Ileana
Cellone, Sergio Aldo
Carpintero, Daniel Diego
Romero, Gustavo Esteban
Combi, Jorge Ariel
author_sort Zibecchi, Lorena
title Micro variability in AGNs: study of different statistical methods: I. Observational analysis
title_short Micro variability in AGNs: study of different statistical methods: I. Observational analysis
title_full Micro variability in AGNs: study of different statistical methods: I. Observational analysis
title_fullStr Micro variability in AGNs: study of different statistical methods: I. Observational analysis
title_full_unstemmed Micro variability in AGNs: study of different statistical methods: I. Observational analysis
title_sort micro variability in agns: study of different statistical methods: i. observational analysis
publishDate 2017
url http://sedici.unlp.edu.ar/handle/10915/82331
work_keys_str_mv AT zibecchilorena microvariabilityinagnsstudyofdifferentstatisticalmethodsiobservationalanalysis
AT andruchowileana microvariabilityinagnsstudyofdifferentstatisticalmethodsiobservationalanalysis
AT cellonesergioaldo microvariabilityinagnsstudyofdifferentstatisticalmethodsiobservationalanalysis
AT carpinterodanieldiego microvariabilityinagnsstudyofdifferentstatisticalmethodsiobservationalanalysis
AT romerogustavoesteban microvariabilityinagnsstudyofdifferentstatisticalmethodsiobservationalanalysis
AT combijorgeariel microvariabilityinagnsstudyofdifferentstatisticalmethodsiobservationalanalysis
bdutipo_str Repositorios
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