Miniatura

Fitxers

567357.pdf (698.61 KB)

Tipus de document

Article

Versió

Versió acceptada

Data de publicació

2008

Tots els drets reservats

Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/44987

Radio detections towards unidentified variable EGRET sources

Títol de la revista

Autors

Director/Tutor

ISSN de la revista

Títol del volum

Recurs relacionat

http://dx.doi.org/10.1051/0004-6361:20078299

Resum

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.

Matèries

Quàsars, Radiofonts, Radioastronomia, Astronomia de raigs gamma, Telescopis espacials

Matèries (anglès)

Quasars, Radio sources (Astronomy), Radio astronomy, Gamma ray astronomy, Space telescopes

Citació

Col·leccions

Articles publicats en revistes (Física Quàntica i Astrofísica)

Citació

PAREDES I POY, Josep maria, MARTÍ RIBAS, Josep, ISHWARA-CHANDRA, C. h., TORRES, Diego f., ROMERO, Gustavo e., COMBI, J. a., BOSCH I RAMON, Valentí, MUÑOZ-ARJONILLA, A. j., SÁNCHEZ-SUTIL, J. r.. Radio detections towards unidentified variable EGRET sources. _Astronomy and Astrophysics_. 2008. Vol. 482, núm. 1, pàgs. 247-253. [consulta: 27 de gener de 2026]. ISSN: 0004-6361. [Disponible a: https://hdl.handle.net/2445/44987]

Exportar metadades

JSON - METS

Compartir registre