Optical microvariability of EGRET blazars

We present results of a photometric CCD study of the incidence of microvariability in the optical emission of a sample of 20 blazars detected at gamma-ray energies by the EGRET instrument of the Compton Gamma-Ray Observatory. We have observed strong outbursts in some sources, but many others display...

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Detalles Bibliográficos
Autores principales: Romero, Gustavo Esteban, Cellone, Sergio Aldo, Combi, Jorge Ariel, Andruchow, Ileana
Formato: Articulo
Lenguaje:Inglés
Publicado: 2002
Materias:
Ciencias Astronómicas
BL Lacertae objects: general
Galaxies: active
Galaxies: photometry
Gamma-rays: observations
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84617
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84617
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
BL Lacertae objects: general
Galaxies: active
Galaxies: photometry
Gamma-rays: observations
spellingShingle Ciencias Astronómicas
BL Lacertae objects: general
Galaxies: active
Galaxies: photometry
Gamma-rays: observations
Romero, Gustavo Esteban
Cellone, Sergio Aldo
Combi, Jorge Ariel
Andruchow, Ileana
Optical microvariability of EGRET blazars
topic_facet Ciencias Astronómicas
BL Lacertae objects: general
Galaxies: active
Galaxies: photometry
Gamma-rays: observations
description We present results of a photometric CCD study of the incidence of microvariability in the optical emission of a sample of 20 blazars detected at gamma-ray energies by the EGRET instrument of the Compton Gamma-Ray Observatory. We have observed strong outbursts in some sources, but many others displayed no significant variability on timescales of hours. The typical minimum timescale is found to be of ∼several hours, not tens of minutes as claimed by some authors. The duty cycle for optical intranight microvariations of gamma-ray blazars, as estimated from our observations, seems to be ∼50%, lower than what is usually assumed. For night-to-night variations, instead, the duty cycle approaches that observed in radio-selected BL Lacs and flat-spectrum radio quasars (i.e. ∼70%).
format Articulo
Articulo
author Romero, Gustavo Esteban
Cellone, Sergio Aldo
Combi, Jorge Ariel
Andruchow, Ileana
author_facet Romero, Gustavo Esteban
Cellone, Sergio Aldo
Combi, Jorge Ariel
Andruchow, Ileana
author_sort Romero, Gustavo Esteban
title Optical microvariability of EGRET blazars
title_short Optical microvariability of EGRET blazars
title_full Optical microvariability of EGRET blazars
title_fullStr Optical microvariability of EGRET blazars
title_full_unstemmed Optical microvariability of EGRET blazars
title_sort optical microvariability of egret blazars
publishDate 2002
url http://sedici.unlp.edu.ar/handle/10915/84617
work_keys_str_mv AT romerogustavoesteban opticalmicrovariabilityofegretblazars
AT cellonesergioaldo opticalmicrovariabilityofegretblazars
AT combijorgeariel opticalmicrovariabilityofegretblazars
AT andruchowileana opticalmicrovariabilityofegretblazars
bdutipo_str Repositorios
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