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Radio follow-up of the gamma-ray flaring gravitational lens JVAS B0218+357
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2016 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 457, no 2, 2263-2271 p.Article in journal (Refereed) PublishedText
Abstract [en]

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.

Place, publisher, year, edition, pages
Oxford University Press, 2016. Vol. 457, no 2, 2263-2271 p.
Keyword [en]
gravitational lensing: strong, quasars: individual: JVAS B0218+357
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Physical Sciences
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URN: urn:nbn:se:kth:diva-186563DOI: 10.1093/mnras/stw136ISI: 000373580500086ScopusID: 2-s2.0-84963527861OAI: oai:DiVA.org:kth-186563DiVA: diva2:928000
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QC 20160513

Available from: 2016-05-13 Created: 2016-05-13 Last updated: 2016-05-13Bibliographically approved

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Larsson, Stefan
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Particle and Astroparticle Physics
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