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

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dc.contributor.authorSpingola, C.
dc.contributor.authorDallacasa, D.
dc.contributor.authorOrienti, M.
dc.contributor.authorGiroletti, M.
dc.contributor.authorJ. P. McKean
dc.contributor.authorCheung, C. C.
dc.contributor.authorHovatta, T.
dc.contributor.authorCiprini, S.
dc.contributor.authorD'Ammando, F.
dc.contributor.authorFalco, E.
dc.contributor.authorLarsson, S.
dc.contributor.authorMax-Moerbeck, W.
dc.contributor.authorOjha, R.
dc.contributor.authorReadhead, A. C. S.
dc.contributor.authorRichards, J. L.
dc.contributor.authorScargle, J.
dc.date.accessioned2020-04-27T13:11:39Z
dc.date.available2020-04-27T13:11:39Z
dc.date.issued2016-02-10
dc.description.abstractWe 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.en_US
dc.description.sponsorshipThe VLBA is operated by the US National Radio Astronomy Observatory which is a facility of the National Science Foundation operated under a cooperative agreement by Associated University, Inc., under contract with the National Science Foundation. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. CCC was supported at NRL by NASA Guest Investigator programme 13-FERMI13-0009. SL was supported by the Royal Swedish Academy Crafoord Foundation. We thank the NRAO Schedsoc for approving our request and Mark Claussen for facilitating the VLBA scheduling. The OVRO 40-m monitoring programme is supported in part by NASA grants NNX08AW31G and NNX11A043G, and NSF grants AST-0808050 and AST-1109911. This research was funded in part by NASA through Fermi Guest Investigator grants NNH09ZDA001N, NNH10ZDA001N, NNH12ZDA001N, NNH13ZDA001N-FERMI. This research was supported by an appointment to the NASA Postdoctoral Program at the Goddard Space Flight Center, administered by Oak Ridge Associated Universities through a contract with NASA.en_US
dc.description.urihttps://academic.oup.com/mnras/article/457/2/2263/971662en_US
dc.format.extent9 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2i3f7-a13h
dc.identifier.citationC. 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, Radio follow-up of the γ-ray flaring gravitational lens JVAS B0218+357, Monthly Notices of the Royal Astronomical Society, Volume 457, Issue 2, 01 April 2016, Pages 2263–2271, https://doi.org/10.1093/mnras/stw136en_US
dc.identifier.urihttps://doi.org/10.1093/mnras/stw136
dc.identifier.urihttp://hdl.handle.net/11603/18289
dc.identifier.urihttps://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Search&refcode=2016MNRAS.457.2263S
dc.identifier.urihttp://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2016MNRAS.457.2263S
dc.language.isoen_USen_US
dc.publisherOxford University Pressen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsPublic Domain Mark 1.0*
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleRadio follow-up of the γ-ray flaring gravitational lens JVAS B0218+357en_US
dc.typeTexten_US

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