Estimating the contribution of Galactic sources to the diffuse neutrino flux

Anchordoqui, Luis A.; Goldberg, Haim; Paul, T.; Silva, Luiz H. M. da; Vlček, B.

doi:10.1103/physrevd.90.123010

Cited by 35 publications

(25 citation statements)

References 135 publications

(194 reference statements)

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“…This result is generally consistent with some other analyses which have found either evidence for a small Galactic contribution [18,19,22,23,26], or little to no evidence for a Galactic contribution [3,5,16,20,21,24,25]. Another analysis focused on energetics alone without anisotropy information found that a large Galactic component is consistent with IceCube's flux measurement [17]. The method presented here benefits from its generality which limits penalty factors for scanning over parameters, or considering numerous possible galactic catalogs, all of which tend to have similar shapes to within the angular resolution of IceCube.…”

Section: Discussionsupporting

confidence: 91%

The galactic contribution to IceCube's astrophysical neutrino flux

Denton

Marfatia

Weiler

2017

J. Cosmol. Astropart. Phys.

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Abstract. High energy neutrinos have been detected by IceCube, but their origin remains a mystery. Determining the sources of this flux is a crucial first step towards multi-messenger studies. In this work we systematically compare two classes of sources with the data: Galactic and extragalactic. We assume that the neutrino sources are distributed according to a class of Galactic models. We build a likelihood function on an event by event basis including energy, event topology, absorption, and direction information. We present the probability that each high energy event with deposited energy E dep > 60 TeV in the HESE sample is Galactic, extragalactic, or background. For Galactic models considered the Galactic fraction of the astrophysical flux has a best fit value of 1.3% and is < 9.5% at 90% CL. A zero Galactic flux is allowed at < 1σ.

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Section: Discussionsupporting

confidence: 91%

The galactic contribution to IceCube's astrophysical neutrino flux

Denton

Marfatia

Weiler

2017

J. Cosmol. Astropart. Phys.

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“…[6] for a recent review). Possible sources are unidentified Galactic PeV sources [7,8] or microquasars [9], pulsar wind nebulae [10], extended Galactic structures like the Fermi Bubbles [11][12][13][14], the Galactic Halo [15] or Sagittarius A˚ [16]. A possible association with a hard diffuse Galactic γ-ray emission [17,18] has also been investigated as well as a contribution of neutrino emission from decaying heavy dark matter [19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Galactic neutrinos in the TeV to PeV range

et al. 2016

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We study the contribution of Galactic sources to the flux of astrophysical neutrinos recently observed by the IceCube Collaboration. We show that in the simplest model of homogeneous and isotropic cosmic ray diffusion in the Milky Way the Galactic diffuse neutrino emission consistent with γ-ray (Fermi-LAT) and cosmic ray data (KASCADE, KASCADE-Grande and CREAM) is expected to account for only 4%´8% of the IceCube flux above 60 TeV. Direct neutrino emission from cosmic ray-gas (pp) interactions in the sources would require an unusually large average opacity above 0.01. On the other hand, we find that the IceCube events already probe Galactic neutrino scenarios via the distribution of event arrival directions. Based on the latter, we show that most Galactic scenarios can only have a limited contribution to the astrophysical signal: diffuse Galactic emission (À 50%), quasi-diffuse emission of neutrino sources (À 65%), extended diffuse emission from the Fermi Bubbles (À 25%) or unidentified TeV γ-ray sources (À 25%). The arguments discussed here leave, at present, dark matter decay unconstrained.

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“…This discovery has triggered many different studies proposing different sources (see, e.g., Refs. [37][38][39] for a general discussion), from standard cosmic accelerators, such as active galactic nuclei [40][41][42][43][44][45][46][47][48][49][50][51], star-forming galaxies [52][53][54][55][56], gamma-ray bursts [57][58][59][60][61][62][63][64][65][66][67], hypernova and supernova remnants [59,[66][67][68][69][70][71], the galactic halo [72], galaxy clusters [73], microquasars [74], neutron stars mergers [75], tidal disruption events of supermassive black holes [76], and from a more general perspective, relating the neutrino flux to the cosmic-ray spectrum [18,63,69,[77]…”

Section: Introductionmentioning

confidence: 99%

Analysis of the 4-year IceCube high-energy starting events

2016

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After four years of data taking, the IceCube neutrino telescope has detected 54 high-energy starting events (HESE, or contained-vertex events) with deposited energies above 20 TeV. They represent the first ever detection of high-energy extraterrestrial neutrinos and therefore, the first step in neutrino astronomy. In order to study the energy, flavor and isotropy of the astrophysical neutrino flux arriving at Earth, we perform different analyses of two different deposited energy intervals, [10 TeV − 10 PeV] and [60 TeV − 10 PeV]. We first consider an isotropic unbroken power-law spectrum and constrain its shape, normalization and flavor composition. Our results are in agreement with the preliminary IceCube results, although we obtain a slightly softer spectrum. We also find that current data are not sensitive to a possible neutrino-antineutrino asymmetry in the astrophysical flux. Then, we show that although a two-component power-law model leads to a slightly better fit, it does not represent a significant improvement with respect to a single powerlaw flux. Finally, we analyze the possible existence of a North-South asymmetry, hinted at by the combination of the HESE sample with the through-going muon data. If only using HESE data, the scarce statistics from the northern hemisphere does not allow us to reach any conclusive answer, which indicates that the HESE sample alone is not driving the potential North-South asymmetry.

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Estimating the contribution of Galactic sources to the diffuse neutrino flux

Cited by 35 publications

References 135 publications

The galactic contribution to IceCube's astrophysical neutrino flux

The galactic contribution to IceCube's astrophysical neutrino flux

Galactic neutrinos in the TeV to PeV range

Analysis of the 4-year IceCube high-energy starting events

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