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http://hdl.handle.net/20.500.12386/24249
Titolo: | Radio follow-up of the γ-ray flaring gravitational lens JVAS B0218+357 | Autori: | Spingola, C. Dallacasa, D. Orienti, M. GIROLETTI, MARCELLO McKean, J. P. Cheung, C. C. Hovatta, T. Ciprini, S. D'AMMANDO, FILIPPO Falco, E. Larsson, S. Max-Moerbeck, W. Ojha, R. Readhead, A. C. S. Richards, J. L. Scargle, J. |
Data pubblicazione: | 2016 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 457 | Fascicolo: | 2 | Da pagina:: | 2263 | 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 γ-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 γ-ray variability is located in the core of the active galactic nuclei, which is opaque up to the highest observing frequency of 22 GHz. | URI: | http://hdl.handle.net/20.500.12386/24249 | URL: | https://academic.oup.com/mnras/article/457/2/2263/971662 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw136 | Bibcode ADS: | 2016MNRAS.457.2263S | Fulltext: | open |
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