Search for steady point-like sources in the astrophysical muon neutrino flux with 8 years of IceCube data

M. Aartsen (Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand) ; M. Ackermann (DESY, Zeuthen, 15738, Germany) ; J. Adams (Department of Physics and Astronomy, University of Canterbury, Christchurch, New Zealand) ; J. Aguilar (Science Faculty CP230, Université Libre de Bruxelles, Brussels, 1050, Belgium) ; M. Ahlers (Niels Bohr Institute, University of Copenhagen, Copenhagen, 2100, Denmark) ; et al. - Show all 327 authors

The IceCube Collaboration has observed a high-energy astrophysical neutrino flux and recently found evidence for neutrino emission from the blazar TXS 0506$$+$$ + 056. These results open a new window into the high-energy universe. However, the source or sources of most of the observed flux of astrophysical neutrinos remains uncertain. Here, a search for steady point-like neutrino sources is performed using an unbinned likelihood analysis. The method searches for a spatial accumulation of muon-neutrino events using the very high-statistics sample of about 497,000 neutrinos recorded by IceCube between 2009 and 2017. The median angular resolution is $$\sim 1^\circ $$ 1 at 1 TeV and improves to $$\sim 0.3^\circ $$ 0.3 for neutrinos with an energy of 1 PeV. Compared to previous analyses, this search is optimized for point-like neutrino emission with the same flux-characteristics as the observed astrophysical muon-neutrino flux and introduces an improved event-reconstruction and parametrization of the background. The result is an improvement in sensitivity to the muon-neutrino flux compared to the previous analysis of $$\sim 35\%$$ 35% assuming an $$E^{-2}$$ E-2 spectrum. The sensitivity on the muon-neutrino flux is at a level of $$E^2 \mathrm {d} N /\mathrm {d} E = 3\cdot 10^{-13}\,\mathrm {TeV}\,\mathrm {cm}^{-2}\,\mathrm {s}^{-1}$$ E2dN/dE=3·10-13TeVcm-2s-1 . No new evidence for neutrino sources is found in a full sky scan and in an a priori candidate source list that is motivated by gamma-ray observations. Furthermore, no significant excesses above background are found from populations of sub-threshold sources. The implications of the non-observation for potential source classes are discussed.

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        {
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        {
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    {
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        {
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        {
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        {
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    {
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        {
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          "value": "Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universit\u00e4t Erlangen-N\u00fcrnberg, Erlangen, 91058, Germany", 
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        {
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        {
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      "given_names": "A.", 
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    {
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    {
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        {
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    {
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        {
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    {
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        {
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        {
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        {
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        {
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        {
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    {
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        {
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    {
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        {
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    {
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        {
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        {
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        {
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    {
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        {
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          "value": "Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY, 11794-3800, USA", 
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    {
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        {
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    {
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        {
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    {
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        {
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    {
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        {
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          "value": "Institut f\u00fcr Physik, Humboldt-Universit\u00e4t zu Berlin, Berlin, 12489, Germany", 
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        {
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      "full_name": "Kopper, C."
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    {
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        {
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        {
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    {
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        {
          "country": "Germany", 
          "value": "Physik-Department, Technische Universit\u00e4t M\u00fcnchen, Garching, 85748, Germany", 
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    {
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        {
          "country": "Germany", 
          "value": "Fakult\u00e4t f\u00fcr Physik & Astronomie, Ruhr-Universit\u00e4t Bochum, Bochum, 44780, Germany", 
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    {
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        {
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          "value": "Institute of Physics, University of Mainz, Staudinger Weg 7, Mainz, 55099, Germany", 
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      "given_names": "G.", 
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    {
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        {
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    {
      "affiliations": [
        {
          "country": "USA", 
          "value": "Department of Physics, Drexel University, 3141 Chestnut Street, Philadelphia, PA, 19104, USA", 
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      "given_names": "N.", 
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        {
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          "value": "Department of Physics, University of Adelaide, Adelaide, 5005, Australia", 
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          "value": "Department of Physics and Astronomy, University of Gent, Gent, 9000, Belgium", 
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    {
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        {
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          "value": "Department of Physics, Pennsylvania State University, University Park, PA, 16802, USA", 
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        {
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          "value": "Niels Bohr Institute, University of Copenhagen, Copenhagen, 2100, Denmark", 
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    {
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        {
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          "value": "Department of Physics, University of Wuppertal, Wuppertal, 42119, Germany", 
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      "surname": "Lauber", 
      "given_names": "F.", 
      "full_name": "Lauber, F."
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    {
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        {
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          "value": "Department of Physics and Wisconsin IceCube Particle Astrophysics Center, University of Wisconsin, Madison, WI, 53706, USA", 
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    {
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        {
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    {
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        {
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          "value": "Department of Physics and Wisconsin IceCube Particle Astrophysics Center, University of Wisconsin, Madison, WI, 53706, USA", 
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    {
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        {
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          "value": "Institute of Physics, University of Mainz, Staudinger Weg 7, Mainz, 55099, Germany", 
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    {
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        {
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          "value": "Institut f\u00fcr Kernphysik, Westf\u00e4lische Wilhelms-Universit\u00e4t M\u00fcnster, M\u00fcnster, 48149, Germany", 
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        {
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          "value": "Department of Physics and Institute for Global Prominent Research, Chiba University, Chiba, 263-8522, Japan", 
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        {
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          "value": "Dienst ELEM, Vrije Universiteit Brussel (VUB), Brussels, 1050, Belgium", 
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    {
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        {
          "country": "USA", 
          "value": "Department of Physics and Wisconsin IceCube Particle Astrophysics Center, University of Wisconsin, Madison, WI, 53706, USA", 
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        {
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          "value": "Department of Physics, University of Wisconsin, River Falls, WI, 54022, USA", 
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    {
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        {
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          "value": "Dienst ELEM, Vrije Universiteit Brussel (VUB), Brussels, 1050, Belgium", 
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    {
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        {
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          "value": "Department of Physics and Astronomy, Michigan State University, East Lansing, MI, 48824, USA", 
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    {
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        {
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          "value": "Department of Physics and Institute for Global Prominent Research, Chiba University, Chiba, 263-8522, Japan", 
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    {
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        {
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          "value": "Department of Physics and Wisconsin IceCube Particle Astrophysics Center, University of Wisconsin, Madison, WI, 53706, USA", 
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    {
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        {
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          "value": "Science Faculty CP230, Universit\u00e9 Libre de Bruxelles, Brussels, 1050, Belgium", 
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    {
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        {
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          "value": "Department of Physics, Yale University, New Haven, CT, 06520, USA", 
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      "given_names": "R.", 
      "full_name": "Maruyama, R."
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    {
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        {
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          "value": "Department of Physics and Institute for Global Prominent Research, Chiba University, Chiba, 263-8522, Japan", 
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    {
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        {
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          "value": "Department of Physics, University of Maryland, College Park, MD, 20742, USA", 
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      "full_name": "Maunu, R."
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    {
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        {
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          "value": "Science Faculty CP230, Universit\u00e9 Libre de Bruxelles, Brussels, 1050, Belgium", 
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          "value": "Niels Bohr Institute, University of Copenhagen, Copenhagen, 2100, Denmark", 
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    {
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        {
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          "value": "Department of Physics, TU Dortmund University, Dortmund, 44221, Germany", 
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      "given_names": "M.", 
      "full_name": "Meier, M."
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    {
      "affiliations": [
        {
          "country": "Germany", 
          "value": "Department of Physics, TU Dortmund University, Dortmund, 44221, Germany", 
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      "full_name": "Menne, T."
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    {
      "affiliations": [
        {
          "country": "USA", 
          "value": "Department of Physics and Wisconsin IceCube Particle Astrophysics Center, University of Wisconsin, Madison, WI, 53706, USA", 
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      "given_names": "G.", 
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    {
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        {
          "country": "Belgium", 
          "value": "Science Faculty CP230, Universit\u00e9 Libre de Bruxelles, Brussels, 1050, Belgium", 
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      "given_names": "T.", 
      "full_name": "Meures, T."
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    {
      "affiliations": [
        {
          "country": "USA", 
          "value": "Department of Physics, University of California, Berkeley, CA, 94720, USA", 
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        {
          "country": "USA", 
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      "given_names": "S.", 
      "full_name": "Miarecki, S."
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    {
      "affiliations": [
        {
          "country": "USA", 
          "value": "Department of Physics and Astronomy, Michigan State University, East Lansing, MI, 48824, USA", 
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      "given_names": "J.", 
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    {
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        {
          "country": "Germany", 
          "value": "Institute of Physics, University of Mainz, Staudinger Weg 7, Mainz, 55099, Germany", 
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      "given_names": "G.", 
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    {
      "affiliations": [
        {
          "country": "Switzerland", 
          "value": "D\u00e9partement de Physique Nucl\u00e9aire et Corpusculaire, Universit\u00e9 de Gen\u00e8ve, Geneva, 1211, Switzerland", 
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      "surname": "Montaruli", 
      "given_names": "T.", 
      "full_name": "Montaruli, T."
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    {
      "affiliations": [
        {
          "country": "Canada", 
          "value": "Department of Physics, University of Alberta, Edmonton, Alberta, T6G 2E1, Canada", 
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      "surname": "Moore", 
      "given_names": "R.", 
      "full_name": "Moore, R."
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    {
      "affiliations": [
        {
          "country": "USA", 
          "value": "Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA", 
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      "surname": "Moulai", 
      "given_names": "M.", 
      "full_name": "Moulai, M."
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    {
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  "license": [
    {
      "url": "https://creativecommons.org/licenses//by/4.0", 
      "license": "CC-BY-4.0"
    }
  ], 
  "copyright": [
    {
      "holder": "The Author(s)", 
      "year": "2019"
    }
  ], 
  "control_number": "46102", 
  "collaborations": [
    {
      "value": "IceCube Collaboration"
    }
  ], 
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      "filetype": "xml", 
      "bucket": "431ca8ec-8a33-49de-ad45-f8787986aaa6", 
      "version_id": "21914fb4-8276-406a-929a-134028004984", 
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  "record_creation_date": "2019-03-13T16:30:18.029585", 
  "collections": [
    {
      "primary": "European Physical Journal C"
    }
  ], 
  "arxiv_eprints": [
    {
      "categories": [
        "hep-ph", 
        "astro-ph.HE"
      ], 
      "value": "1811.07979"
    }
  ], 
  "abstracts": [
    {
      "source": "Springer", 
      "value": "The IceCube Collaboration has observed a high-energy astrophysical neutrino flux and recently found evidence for neutrino emission from the blazar TXS 0506$$+$$ <math><mo>+</mo></math> 056. These results open a new window into the high-energy universe. However, the source or sources of most of the observed flux of astrophysical neutrinos remains uncertain. Here, a search for steady point-like neutrino sources is performed using an unbinned likelihood analysis. The method searches for a spatial accumulation of muon-neutrino events using the very high-statistics sample of about 497,000 neutrinos recorded by IceCube between 2009 and 2017. The median angular resolution is $$\\sim 1^\\circ $$ <math><mrow><mo>\u223c</mo><msup><mn>1</mn><mo>\u2218</mo></msup></mrow></math>  at 1 TeV and improves to $$\\sim 0.3^\\circ $$ <math><mrow><mo>\u223c</mo><mn>0</mn><mo>.</mo><msup><mn>3</mn><mo>\u2218</mo></msup></mrow></math>  for neutrinos with an energy of 1 PeV. Compared to previous analyses, this search is optimized for point-like neutrino emission with the same flux-characteristics as the observed astrophysical muon-neutrino flux and introduces an improved event-reconstruction and parametrization of the background. The result is an improvement in sensitivity to the muon-neutrino flux compared to the previous analysis of $$\\sim 35\\%$$ <math><mrow><mo>\u223c</mo><mn>35</mn><mo>%</mo></mrow></math>  assuming an $$E^{-2}$$ <math><msup><mi>E</mi><mrow><mo>-</mo><mn>2</mn></mrow></msup></math>  spectrum. The sensitivity on the muon-neutrino flux is at a level of $$E^2 \\mathrm {d} N /\\mathrm {d} E = 3\\cdot 10^{-13}\\,\\mathrm {TeV}\\,\\mathrm {cm}^{-2}\\,\\mathrm {s}^{-1}$$ <math><mrow><msup><mi>E</mi><mn>2</mn></msup><mi>d</mi><mi>N</mi><mo>/</mo><mi>d</mi><mi>E</mi><mo>=</mo><mn>3</mn><mo>\u00b7</mo><msup><mn>10</mn><mrow><mo>-</mo><mn>13</mn></mrow></msup><mspace width=\"0.166667em\"></mspace><mi>TeV</mi><mspace width=\"0.166667em\"></mspace><msup><mrow><mi>cm</mi></mrow><mrow><mo>-</mo><mn>2</mn></mrow></msup><mspace width=\"0.166667em\"></mspace><msup><mrow><mi>s</mi></mrow><mrow><mo>-</mo><mn>1</mn></mrow></msup></mrow></math> . No new evidence for neutrino sources is found in a full sky scan and in an a priori candidate source list that is motivated by gamma-ray observations. Furthermore, no significant excesses above background are found from populations of sub-threshold sources. The implications of the non-observation for potential source classes are discussed."
    }
  ], 
  "imprints": [
    {
      "date": "2019-03-13", 
      "publisher": "Springer"
    }
  ]
}
Published on:
13 March 2019
Publisher:
Springer
Published in:
European Physical Journal C , Volume 79 (2019)
Issue 3
Pages 1-19
DOI:
https://doi.org/10.1140/epjc/s10052-019-6680-0
arXiv:
1811.07979
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

Fulltext files: