A Search for IceCube Events in the Direction of ANITA Neutrino Candidates

Aartsen, M. G.Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch, New Zealand (author)

For complete list of authors see http://dx.doi.org/10.3847/1538-4357/ab791d
During the first three flights of the Antarctic Impulsive Transient Antenna (ANITA) experiment, the collaboration detected several neutrino candidates. Two of these candidate events were consistent with an ultra-high-energy upgoing air shower and compatible with a tau neutrino interpretation. A third neutrino candidate event was detected in a search for Askaryan radiation in the Antarctic ice, although it is also consistent with the background expectation. The inferred emergence angle of the first two events is in tension with IceCube and ANITA limits on isotropic cosmogenic neutrino fluxes. Here we test the hypothesis that these events are astrophysical in origin, possibly caused by a point source in the reconstructed direction. Given that any ultra-high-energy tau neutrino flux traversing the Earth should be accompanied by a secondary flux in the TeV-PeV range, we search for these secondary counterparts in 7 yr of IceCube data using three complementary approaches. In the absence of any significant detection, we set upper limits on the neutrino flux from potential point sources. We compare these limits to ANITA's sensitivity in the same direction and show that an astrophysical explanation of these anomalous events under standard model assumptions is severely constrained regardless of source spectrum.

Botner, OlgaUppsala universitet,Högenergifysik(Swepub:uu)olgabotn (author)
Burgman, A.Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden (author)
Hallgren, Allan,1951-Uppsala universitet,Högenergifysik(Swepub:uu)allahall (author)
Pérez de los Heros, CarlosUppsala universitet,Högenergifysik(Swepub:uu)capedlhe (author)
Unger, E. (author)
Zoecklein, M.Rhein Westfal TH Aachen, Phys Inst 3, D-52056 Aachen, Germany (author)
Ahrens, MaryonStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)main1402 (author)
Bohm, ChristianStockholms universitet,Oskar Klein-centrum för kosmopartikelfysik (OKC),Fysikum(Swepub:su)bohm (author)
Deoskar, KunalStockholms universitet,Oskar Klein-centrum för kosmopartikelfysik (OKC),Fysikum(Swepub:su)kude4539 (author)
Finley, ChadStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)cfinl (author)
Hultqvist, KlasStockholms universitet,Oskar Klein-centrum för kosmopartikelfysik (OKC),Fysikum(Swepub:su)klas (author)
O'Sullivan, ErinStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)eos (author)
Walck, ChristianStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)walck (author)
Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch, New ZealandHögenergifysik (creator_code:org_t)

By the author/editor: Aartsen, M. G.; Botner, Olga; Burgman, A.; Hallgren, Allan, ...; Pérez de los Her ...; Unger, E.; show more...; Zoecklein, M.; Ahrens, Maryon; Bohm, Christian; Deoskar, Kunal; Finley, Chad; Hultqvist, Klas; O'Sullivan, Erin; Walck, Christian; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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