FERMI LARGE AREA TELESCOPE DETECTION OF GRAVITATIONAL LENS DELAYED γ-RAY FLARES FROM BLAZAR B0218+357

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dc.contributor.authorCheung, C. C.
dc.contributor.authorLarsson, S.
dc.contributor.authorScargle, J. D.
dc.contributor.authorAmin, M. A.
dc.contributor.authorBlandford, R. D.
dc.contributor.authorBulmash, D.
dc.contributor.authorChiang, J.
dc.contributor.authorCiprini, S.
dc.contributor.authorCorbet, R. H. D.
dc.contributor.authorFalco, E. E.
dc.contributor.authorMarshall, P. J.
dc.contributor.authorWood, D. L.
dc.contributor.authorAjello, M.
dc.contributor.authorBastieri, D.
dc.contributor.authorChekhtman, A.
dc.contributor.authorD'Ammando, F.
dc.contributor.authorGiroletti, M.
dc.contributor.authorGrove, J. E.
dc.contributor.authorLott, B.
dc.contributor.authorOjha, R.
dc.contributor.authorOrienti, M.
dc.contributor.authorPerkins, J. S.
dc.contributor.authorRazzano, M.
dc.contributor.authorSmith, A. W.
dc.contributor.authorThompson, D. J.
dc.contributor.authorWood, K. S.
dc.date.accessioned2020-04-03T14:59:33Z
dc.date.available2020-04-03T14:59:33Z
dc.date.issued2014-01-30
dc.description.abstractUsing data from the Fermi Large Area Telescope (LAT), we report the first clear γ-ray measurement of a delay between flares from the gravitationally lensed images of a blazar. The delay was detected in B0218+357, a known double-image lensed system, during a period of enhanced γ-ray activity with peak fluxes consistently observed to reach >20-50 × its previous average flux. An auto-correlation function analysis identified a delay in the γ-ray data of 11.46 ± 0.16 days (1σ) that is ~1 day greater than previous radio measurements. Considering that it is beyond the capabilities of the LAT to spatially resolve the two images, we nevertheless decomposed individual sequences of superposing γ-ray flares/delayed emissions. In three such ~8-10 day-long sequences within a ~4 month span, considering confusion due to overlapping flaring emission and flux measurement uncertainties, we found flux ratios consistent with ~1, thus systematically smaller than those from radio observations. During the first, best-defined flare, the delayed emission was detailed with a Fermi pointing, and we observed flux doubling timescales of ~3-6 hr implying as well extremely compact γ-ray emitting regions.en_US
dc.description.sponsorshipThe Fermi-LAT Collaboration acknowledges support from a number of agencies and institutes for both development and the operation of the LAT as well as scientific data analysis. These include NASA and DOE in the United States, CEA/Irfu and IN2P3/CNRS in France, ASI and INFN in Italy, MEXT, KEK, and JAXA in Japan, and the K.A. Wallenberg Foundation, the Swedish Research Council, and the National Space Board in Sweden. Additional support from INAF in Italy and CNES in France for science analysis during the operations phase is also gratefully acknowledged. C.C.C. was supported at NRL in part by NASA DPR S-15633-Y.en_US
dc.description.urihttps://iopscience.iop.org/article/10.1088/2041-8205/782/2/L14en_US
dc.format.extent7 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m28rmb-rumr
dc.identifier.citationC. C. Cheung, S. Larsson, J. D. Scargle, M. A. Amin, R. D. Blandford, D. Bulmash, J. Chiang, S. Ciprini,R. H. D. Corbet, E. E. Falco, P. J. Marshall, D. L. Wood, M. Ajello, D. Bastieri, A. Chekhtman, F. D'Ammando, M. Giroletti, J. E. Grove, B. Lott, R. Ojha, M. Orienti, J. S. Perkins, M. Razzano, A. W. Smith, D. J. Thompson, K. S. Wood, FERMI LARGE AREA TELESCOPE DETECTION OF GRAVITATIONAL LENS DELAYED γ-RAY FLARES FROM BLAZAR B0218+357, The Astrophysical Journal, 2014, Volume 782, https://iopscience.iop.org/article/10.1088/2041-8205/782/2/L14en_US
dc.identifier.urihttp://hdl.handle.net/11603/17801
dc.identifier.urihttp://simbad.u-strasbg.fr/simbad/sim-ref?querymethod=bib&simbo=on&submit=submit+bibcode&bibcode=2014ApJ...782L..14C
dc.identifier.urihttps://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Search&refcode=2014ApJ...782L..14C
dc.language.isoen_USen_US
dc.publisherIOPen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
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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.titleFERMI LARGE AREA TELESCOPE DETECTION OF GRAVITATIONAL LENS DELAYED γ-RAY FLARES FROM BLAZAR B0218+357en_US
dc.typeTexten_US

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