Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164

We present a long-term and intraday variability study of optical multiwaveband (UBVRI) data from the blazar AO 0235+164 collected by various telescopes for ∼44 yr (1975–2019). The blazar was found to be significantly variable over the years in all wave bands with a variation of about 6 mag between i...

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Detalles Bibliográficos
Autores principales: Cellone, Sergio Aldo, Romero, Gustavo Esteban
Formato: Articulo
Lenguaje:Inglés
Publicado: 2023
Materias:
Ciencias Astronómicas
Galaxies
Active galaxies
BL Lacertae objects
Quasars
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/152611
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-152611
record_format dspace
spelling I19-R120-10915-1526112023-05-09T20:06:25Z http://sedici.unlp.edu.ar/handle/10915/152611 issn:1538-4365 Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164 Cellone, Sergio Aldo Romero, Gustavo Esteban 2023 2023-05-09T12:24:52Z en Ciencias Astronómicas Galaxies Active galaxies BL Lacertae objects Quasars We present a long-term and intraday variability study of optical multiwaveband (UBVRI) data from the blazar AO 0235+164 collected by various telescopes for ∼44 yr (1975–2019). The blazar was found to be significantly variable over the years in all wave bands with a variation of about 6 mag between its low and active states. The variations in the different wave bands are highly correlated without any time lag. We did not observe any significant trend in color variation with time, but we observed a bluer-when-brighter trend between the B − I color index and the R magnitude. Optical BVR-band spectral energy distributions always show a convex shape. Significant intraday variability was frequently seen in the quasi-simultaneous observations of AO 0235+164 made on 22 nights in the R and V bands by the CASLEO and CAHA telescopes during 1999–2019. We also estimated a central supermassive black hole mass of 7.9 × 10⁷ M☉ by analyzing the broad Mg II emission line in AO 0235 +164ʼs spectrum. We briefly explore the probable physical scenarios responsible for the observed variability. Instituto Argentino de Radioastronomía Facultad de Ciencias Astronómicas y Geofísicas Articulo Articulo http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Galaxies
Active galaxies
BL Lacertae objects
Quasars
spellingShingle Ciencias Astronómicas
Galaxies
Active galaxies
BL Lacertae objects
Quasars
Cellone, Sergio Aldo
Romero, Gustavo Esteban
Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164
topic_facet Ciencias Astronómicas
Galaxies
Active galaxies
BL Lacertae objects
Quasars
description We present a long-term and intraday variability study of optical multiwaveband (UBVRI) data from the blazar AO 0235+164 collected by various telescopes for ∼44 yr (1975–2019). The blazar was found to be significantly variable over the years in all wave bands with a variation of about 6 mag between its low and active states. The variations in the different wave bands are highly correlated without any time lag. We did not observe any significant trend in color variation with time, but we observed a bluer-when-brighter trend between the B − I color index and the R magnitude. Optical BVR-band spectral energy distributions always show a convex shape. Significant intraday variability was frequently seen in the quasi-simultaneous observations of AO 0235+164 made on 22 nights in the R and V bands by the CASLEO and CAHA telescopes during 1999–2019. We also estimated a central supermassive black hole mass of 7.9 × 10⁷ M☉ by analyzing the broad Mg II emission line in AO 0235 +164ʼs spectrum. We briefly explore the probable physical scenarios responsible for the observed variability.
format Articulo
Articulo
author Cellone, Sergio Aldo
Romero, Gustavo Esteban
author_facet Cellone, Sergio Aldo
Romero, Gustavo Esteban
author_sort Cellone, Sergio Aldo
title Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164
title_short Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164
title_full Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164
title_fullStr Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164
title_full_unstemmed Study of Variability in Long-term Multiwavelength Optical Lightcurves of Blazar AO 0235+164
title_sort study of variability in long-term multiwavelength optical lightcurves of blazar ao 0235+164
publishDate 2023
url http://sedici.unlp.edu.ar/handle/10915/152611
work_keys_str_mv AT cellonesergioaldo studyofvariabilityinlongtermmultiwavelengthopticallightcurvesofblazarao0235164
AT romerogustavoesteban studyofvariabilityinlongtermmultiwavelengthopticallightcurvesofblazarao0235164
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