Radio detections towards unidentified variable EGRET sources

Context. A considerable fraction of the -ray sources discovered with the Energetic Gamma-Ray Experiment Telescope (EGRET) remain unidentified. The EGRET sources that have been properly identified are either pulsars or variable sources at both radio and gamma-ray wavelengths. Most of the variable sou...

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Detalles Bibliográficos
Autores principales: Paredes, J. M., Martí, J., Ishwara Chandra, C. H., Torres, Diego F., Romero, Gustavo Esteban, Combi, Jorge Ariel, Bosch Ramon, V., Muñoz Arjonilla, A. J., Sánchez Sutil, J. R.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2008
Materias:
Ciencias Astronómicas
Gamma rays: observations
Radio continuum: stars
X-rays: binaries
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84182
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84182
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
Gamma rays: observations
Radio continuum: stars
X-rays: binaries
spellingShingle Ciencias Astronómicas
Gamma rays: observations
Radio continuum: stars
X-rays: binaries
Paredes, J. M.
Martí, J.
Ishwara Chandra, C. H.
Torres, Diego F.
Romero, Gustavo Esteban
Combi, Jorge Ariel
Bosch Ramon, V.
Muñoz Arjonilla, A. J.
Sánchez Sutil, J. R.
Radio detections towards unidentified variable EGRET sources
topic_facet Ciencias Astronómicas
Gamma rays: observations
Radio continuum: stars
X-rays: binaries
description Context. A considerable fraction of the -ray sources discovered with the Energetic Gamma-Ray Experiment Telescope (EGRET) remain unidentified. The EGRET sources that have been properly identified are either pulsars or variable sources at both radio and gamma-ray wavelengths. Most of the variable sources are strong radio blazars. However, some low galactic-latitude EGRET sources, with highly variable -ray emission, lack any evident counterpart according to the radio data available until now. Aims. The primary goal of this paper is to identify and characterise the potential radio counterparts of four highly variable -ray sources in the galactic plane through mapping the radio surroundings of the EGRET confidence contours and determining the variable radio sources in the field whenever possible. Methods. We have carried out a radio exploration of the fields of the selected EGRET sources using the Giant Metrewave Radio Telescope (GMRT) interferometer at 21 cm wavelength, with pointings being separated by months. Results. We detected a total of 151 radio sources. Among them, we identified a few radio sources whose flux density has apparently changed on timescales of months. Despite the limitations of our search, their possible variability makes these objects a top-priority target for multiwavelength studies of the potential counterparts of highly variable, unidentified gamma-ray sources.
format Articulo
Articulo
author Paredes, J. M.
Martí, J.
Ishwara Chandra, C. H.
Torres, Diego F.
Romero, Gustavo Esteban
Combi, Jorge Ariel
Bosch Ramon, V.
Muñoz Arjonilla, A. J.
Sánchez Sutil, J. R.
author_facet Paredes, J. M.
Martí, J.
Ishwara Chandra, C. H.
Torres, Diego F.
Romero, Gustavo Esteban
Combi, Jorge Ariel
Bosch Ramon, V.
Muñoz Arjonilla, A. J.
Sánchez Sutil, J. R.
author_sort Paredes, J. M.
title Radio detections towards unidentified variable EGRET sources
title_short Radio detections towards unidentified variable EGRET sources
title_full Radio detections towards unidentified variable EGRET sources
title_fullStr Radio detections towards unidentified variable EGRET sources
title_full_unstemmed Radio detections towards unidentified variable EGRET sources
title_sort radio detections towards unidentified variable egret sources
publishDate 2008
url http://sedici.unlp.edu.ar/handle/10915/84182
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bdutipo_str Repositorios
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