Radio follow-up of the γ-ray flaring gravitational lens JVAS B0218+357

C. Spingola*, D. Dallacasa, M. Orienti, M. Giroletti, J. P. McKean, C. C. Cheung, T. Hovatta, S. Ciprini, F. D'Ammando, E. Falco, S. Larsson, W. Max-Moerbeck, R. Ojha, A. C S Readhead, J. L. Richards, J. Scargle

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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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 milliarcsecondscale 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.

Original languageEnglish
Pages (from-to)2263-2271
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume457
Issue number2
DOIs
Publication statusPublished - 1 Apr 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • Gravitational lensing: strong
  • Quasars: individual: JVAS B0218+357

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