Radio follow-up of the gamma-ray flaring gravitational lens JVAS B0218+357
Abstract
We present results on multifrequency Very Long Baseline Array (VLBA) monitoring observations of the double-image gravitationally lensed blazar JVAS B0218+357. Multi-epoch observations started less than one month after the gamma-ray flare detected in 2012 by the Large Area Telescope on board Fermi, and spanned a 2-month interval. The radio light curves did not reveal any significant flux density variability, suggesting that no clear correlation between the high-energy and low-energy emission is present. This behaviour was confirmed also by the long-term Owens Valley Radio Observatory monitoring data at 15 GHz. The milliarcsecond-scale resolution provided by the VLBA observations allowed us to resolve the two images of the lensed blazar, which have a core-jet structure. No significant morphological variation is found by the analysis of the multi-epoch data, suggesting that the region responsible for the gamma-ray variability is located in the core of the active galactic nuclei, which is opaque up to the highest observing frequency of 22 GHz.
Más información
Título según WOS: | ID WOS:000373580500086 Not found in local WOS DB |
Título de la Revista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
Volumen: | 457 |
Número: | 2 |
Editorial: | OXFORD UNIV PRESS |
Fecha de publicación: | 2016 |
Página de inicio: | 2263 |
Página final: | 2271 |
DOI: |
10.1093/mnras/stw136 |
Notas: | ISI |