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dc.contributor.authorArchambault, S.
dc.contributor.authorArcher, A.
dc.contributor.authorBenbow, W.
dc.contributor.authorBuchovecky, M.
dc.contributor.authorBugaev, V.
dc.contributor.authorCerruti, M.
dc.contributor.authorConnolly, M. P.
dc.contributor.authorCui, W.
dc.contributor.authorFalcone, A.
dc.contributor.authorAlonso, M. Fernández
dc.contributor.authorFinley, J. P.
dc.contributor.authorFleischhack, H.
dc.contributor.authorFortson, L.
dc.contributor.authorFurniss, A.
dc.contributor.authorGriffin, S.
dc.contributor.authorHütten, M.
dc.contributor.authorHervet, O.
dc.contributor.authorHolder, J.
dc.contributor.authorHumensky, T. B.
dc.contributor.authorJohnson, C. A.
dc.contributor.authorKaaret, P.
dc.contributor.authorKar, P.
dc.contributor.authorKieda, D.
dc.contributor.authorKrause, M.
dc.contributor.authorKrennrich, F.
dc.contributor.authorLang, M. J.
dc.contributor.authorLin, T. T. Y.
dc.contributor.authorMaier, G.
dc.contributor.authorMcArthur, S.
dc.contributor.authorMoriarty, P.
dc.contributor.authorNieto, D.
dc.contributor.authorO’Brien, S.
dc.contributor.authorOng, R. A.
dc.contributor.authorOtte, A. N.
dc.contributor.authorPohl, M.
dc.contributor.authorPopkow, A.
dc.contributor.authorPueschel, E.
dc.contributor.authorQuinn, J.
dc.contributor.authorRagan, K.
dc.contributor.authorReynolds, P. T.
dc.contributor.authorRichards, G. T.
dc.contributor.authorRoache, E.
dc.contributor.authorRovero, A. C.
dc.contributor.authorSadeh, I.
dc.contributor.authorShahinyan, K.
dc.contributor.authorStaszak, D.
dc.contributor.authorTelezhinsky, I.
dc.contributor.authorTyler, J.
dc.contributor.authorWakely, S. P.
dc.contributor.authorWeinstein, A.
dc.contributor.authorWeisgarber, T.
dc.contributor.authorWilcox, P.
dc.contributor.authorWilhelm, A.
dc.contributor.authorWilliams, D. A.
dc.contributor.authorZitzer, B.
dc.identifier.citationArchambault, S. Archer, A.; Benbow, W.; Buchovecky, M.; Bugaev, V.; Cerruti, M.; Connolly, M. P.; Cui, W.; Falcone, A.; Alonso, M. Fernández; Finley, J. P.; Fleischhack, H.; Fortson, L.; Furniss, A.; Griffin, S.; Hütten, M.; Hervet, O.; Holder, J.; Humensky, T. B.; Johnson, C. A.; Kaaret, P.; Kar, P.; Kieda, D.; Krause, M.; Krennrich, F.; Lang, M. J.; Lin, T. T. Y.; Maier, G.; McArthur, S.; Moriarty, P.; Nieto, D.; O’Brien, S.; Ong, R. A.; Otte, A. N.; Pohl, M.; Popkow, A.; Pueschel, E.; Quinn, J.; Ragan, K.; Reynolds, P. T.; Richards, G. T.; Roache, E.; Rovero, A. C.; Sadeh, I.; Shahinyan, K.; Staszak, D.; Telezhinsky, I.; Tyler, J.; Wakely, S. P.; Weinstein, A.; Weisgarber, T.; Wilcox, P.; Wilhelm, A.; Williams, D. A.; Zitzer, B. (2017). Search for magnetically broadened cascade emission from blazars with veritas. The Astrophysical Journal 835 (2),
dc.description.abstractWe present a search for magnetically broadened gamma-ray emission around active galactic nuclei (AGNs), using VERITAS observations of seven hard-spectrum blazars. A cascade process occurs when multi-TeV gamma-rays from an AGN interact with extragalactic background light (EBL) photons to produce electron-positron pairs, which then interact with cosmic microwave background photons via inverse-Compton scattering to produce gamma-rays. Due to the deflection of the electron- positron pairs, a non-zero intergalactic magnetic field (IGMF) would potentially produce detectable effects on the angular distribution of the cascade emission. In particular, an angular broadening compared to the unscattered emission could occur. Through non-detection of angularly broadened emission from 1ES 1218 vertical bar 304, the source with the largest predicted cascade fraction, we exclude a range of IGMF strengths around 10(-14) G at the 95% confidence level. The extent of the exclusion range varies with the assumptions made about the intrinsic spectrum of 1ES. 1218+304 and the EBL model used in the simulation of the cascade process. All of the sources are used to set limits on the flux due to extended emission.
dc.publisherAmerican Astronomical Society
dc.relation.ispartofThe Astrophysical Journal
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Ireland
dc.subjectbl lacertae objects: general
dc.subjectgalaxies: active
dc.subjectgamma rays: galaxies
dc.subjectmagnetic fields
dc.subjectextragalactic background light
dc.subjectactive galactic nuclei
dc.subjectgamma-ray observations
dc.subjectlarge-area telescope
dc.subjectpair halos
dc.subjectcosmic voids
dc.subjecttev blazars
dc.titleSearch for magnetically broadened cascade emission from blazars with veritas

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