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Radio follow-up of ...
Radio follow-up of the gamma-ray flaring gravitational lens JVAS B0218+357
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Spingola, C. (author)
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Dallacasa, D. (author)
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Orienti, M. (author)
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Giroletti, M. (author)
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McKean, J. P. (author)
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Cheung, C. C. (author)
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Hovatta, T. (author)
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Ciprini, S. (author)
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D'Ammando, F. (author)
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Falco, E. (author)
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- Larsson, Stefan (author)
- KTH,Partikel- och astropartikelfysik,The Oskar Klein Centre for Cosmoparticle Physics, Sweden
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Max-Moerbeck, W. (author)
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Ojha, R. (author)
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Readhead, A. C. S. (author)
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Richards, J. L. (author)
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Scargle, J. (author)
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(creator_code:org_t)
- 2016-02-10
- 2016
- English.
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In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 457:2, s. 2263-2271
- Related links:
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https://academic.oup...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- gravitational lensing: strong
- quasars: individual: JVAS B0218+357
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Spingola, C.
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Dallacasa, D.
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Orienti, M.
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Giroletti, M.
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McKean, J. P.
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Cheung, C. C.
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show more...
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Hovatta, T.
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Ciprini, S.
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D'Ammando, F.
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Falco, E.
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Larsson, Stefan
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Max-Moerbeck, W.
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Ojha, R.
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Readhead, A. C. ...
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Richards, J. L.
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Scargle, J.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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Monthly notices ...
- By the university
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Royal Institute of Technology