Radio follow-up of the γ-ray flaring gravitational lens JVAS B0218+357
Date Issued
2016
Author(s)
Spingola, C.
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McKean, J. P.
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Cheung, C. C.
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Hovatta, T.
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Ciprini, S.
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Falco, E.
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Larsson, S.
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Max-Moerbeck, W.
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Ojha, R.
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Readhead, A. C. S.
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Richards, J. L.
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Scargle, J.
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.
Volume
457
Issue
2
Start page
2263
Issn Identifier
0035-8711
Ads BibCode
2016MNRAS.457.2263S
Rights
open.access
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