The incidence of the host galaxy in microvariability observations of quasars

The incidence of a host galaxy in aperture photometry of active galactic nuclei is studied by means of actual and simulated CCD observations. Our goal is to evaluate the importance of spurious variations, introduced by seeing fluctuations during the observations, in the differential light curves use...

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Detalles Bibliográficos
Autores principales: Cellone, Sergio Aldo, Romero, Gustavo Esteban, Combi, Jorge Ariel
Formato: Articulo
Lenguaje:Inglés
Publicado: 2000
Materias:
Ciencias Astronómicas
Galaxies: photometry
Quasars: individual (PKS 2316-423)
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83474
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83474
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
Galaxies: photometry
Quasars: individual (PKS 2316-423)
spellingShingle Ciencias Astronómicas
Galaxies: photometry
Quasars: individual (PKS 2316-423)
Cellone, Sergio Aldo
Romero, Gustavo Esteban
Combi, Jorge Ariel
The incidence of the host galaxy in microvariability observations of quasars
topic_facet Ciencias Astronómicas
Galaxies: photometry
Quasars: individual (PKS 2316-423)
description The incidence of a host galaxy in aperture photometry of active galactic nuclei is studied by means of actual and simulated CCD observations. Our goal is to evaluate the importance of spurious variations, introduced by seeing fluctuations during the observations, in the differential light curves used to study optical microvariability. Repeated CCD observations during two consecutive nights were used to obtain time-resolved aperture photometry for the BL Lac object PKS 2316-423, which is located at the center of a conspicuous elliptical galaxy, and for several field stars. The blazar seems to be variable according to standard variability criteria; however we show that the observed differential magnitude variations are strongly correlated with seeing fluctuations during the nights. Moreover, another galaxy within the same CCD field shows nearly identical variations, clearly indicating that such variations are artifacts of the aperture photometry. Simulated observations of quasars within host galaxies of different morphologies and spanning a wide range of luminosities were also used to evaluate the effects of changing seeing conditions. The results show that spurious differential magnitude variations due to seeing fluctuations are larger for active nuclei within brighter hosts, particularly when small photometric apertures (about the seeing FWHM in radius) are used. According to our results, several recommendations are given to future observers.
format Articulo
Articulo
author Cellone, Sergio Aldo
Romero, Gustavo Esteban
Combi, Jorge Ariel
author_facet Cellone, Sergio Aldo
Romero, Gustavo Esteban
Combi, Jorge Ariel
author_sort Cellone, Sergio Aldo
title The incidence of the host galaxy in microvariability observations of quasars
title_short The incidence of the host galaxy in microvariability observations of quasars
title_full The incidence of the host galaxy in microvariability observations of quasars
title_fullStr The incidence of the host galaxy in microvariability observations of quasars
title_full_unstemmed The incidence of the host galaxy in microvariability observations of quasars
title_sort incidence of the host galaxy in microvariability observations of quasars
publishDate 2000
url http://sedici.unlp.edu.ar/handle/10915/83474
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