Improved Characterization of the Astrophysical Muon-neutrino Flux with 9.5 Years of IceCube Data

被引：99

作者：

Abbasi, R. ^{[1
]}

Ackermann, M. ^{[2
]}

Adams, J. ^{[3
]}

Aguilar, J. A. ^{[4
]}

Ahlers, M. ^{[5
]}

Ahrens, M. ^{[6
,7
]}

Alameddine, J. M. ^{[8
]}

Alispach, C. ^{[9
]}

Alves, A. A., Jr. ^{[10
]}

Amin, N. M. ^{[11
,12
]}

Andeen, K. ^{[13
]}

Anderson, T. ^{[14
]}

Anton, G. ^{[15
]}

Arguelles, C. ^{[16
,17
]}

Ashida, Y. ^{[18
,19
]}

Axani, S. ^{[20
]}

Bai, X. ^{[21
]}

Balagopal, A. ^{[18
,19
]}

Barbano, A. ^{[9
]}

Barwick, S. W. ^{[22
]}

Bastian, B. ^{[2
]}

Basu, V ^{[18
,19
]}

Baur, S. ^{[4
]}

Bay, R. ^{[23
]}

Beatty, J. J. ^{[24
,25
,26
]}

Becker, K-H ^{[27
]}

Tjus, J. Becker ^{[28
]}

Bellenghi, C. ^{[29
]}

BenZvi, S. ^{[30
]}

Berley, D. ^{[31
]}

Bernardini, E. ^{[2
,68
]}

Besson, D. Z. ^{[32
,69
]}

Binder, G. ^{[23
,33
]}

Bindig, D. ^{[27
]}

Blaufuss, E. ^{[31
]}

Blot, S. ^{[2
]}

Boddenberg, M. ^{[34
]}

Bontempo, F. ^{[10
]}

Borowka, J. ^{[34
]}

Boser, S. ^{[35
]}

Botner, O. ^{[36
]}

Bottcher, J. ^{[34
]}

Bourbeau, E. ^{[5
]}

Bradascio, F. ^{[2
]}

Braun, J. ^{[18
,19
]}

Brinson, B. ^{[37
,38
]}

Bron, S. ^{[9
]}

Brostean-Kaiser, J. ^{[2
]}

Browne, S. ^{[39
]}

Burgman, A. ^{[36
]}

机构：

[1] Loyola Univ Chicago, Dept Phys, Chicago, IL 60660 USA

[2] DESY, D-15738 Zeuthen, Germany

[3] Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch, New Zealand

[4] Univ Libre Bruxelles, Sci Fac, CP230, B-1050 Brussels, Belgium

[5] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark

[6] Stockholm Univ, Oskar Klein Ctr, SE-10691 Stockholm, Sweden

[7] Stockholm Univ, Dept Phys, SE-10691 Stockholm, Sweden

[8] TU Dortmund Univ, Dept Phys, D-44221 Dortmund, Germany

[9] Univ Geneva, Dept Phys Nucl & Corpusculaire, CH-1211 Geneva, Switzerland

[10] Karlsruhe Inst Technol, Inst Astroparticle Phys, D-76021 Karlsruhe, Germany

[11] Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA

[12] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

[13] Marquette Univ, Dept Phys, Milwaukee, WI 53201 USA

[14] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

[15] Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, D-91058 Erlangen, Germany

[16] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[17] Harvard Univ, Lab Particle Phys & Cosmol, Cambridge, MA 02138 USA

[18] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA

[19] Univ Wisconsin, Wisconsin IceCube Particle Astrophys Ctr, Madison, WI 53706 USA

[20] MIT, Dept Phys, Cambridge, MA 02139 USA

[21] South Dakota Sch Mines & Technol, Phys Dept, Rapid City, SD 57701 USA

[22] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA

[23] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[24] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA

[25] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[26] Ohio State Univ, Ctr Cosmol & Astroparticle Phys, Columbus, OH 43210 USA

[27] Univ Wuppertal, Dept Phys, D-42119 Wuppertal, Germany

[28] Ruhr Univ Bochum, Fak Phys & Astron, D-44780 Bochum, Germany

[29] Tech Univ Munich, Phys Dept, D-85748 Garching, Germany

[30] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA

[31] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[32] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA

[33] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[34] Rhein Westfal TH Aachen, Phys Inst 3, D-52056 Aachen, Germany

[35] Johannes Gutenberg Univ Mainz, Inst Phys, Staudinger Weg 7, D-55099 Mainz, Germany

[36] Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden

[37] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA

[38] Georgia Inst Technol, Ctr Relativist Astrophys, Atlanta, GA 30332 USA

[39] Karlsruhe Inst Technol, Inst Expt Particle Phys, D-76021 Karlsruhe, Germany

[40] Univ Adelaide, Dept Phys, Adelaide, SA 5005, Australia

[41] Westfalische Wilhelms Univ Munster, Inst Kernphys, D-48149 Munster, Germany

[42] Drexel Univ, Dept Phys, 3141 Chestnut St, Philadelphia, PA 19104 USA

[43] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

[44] Sungkyunkwan Univ, Dept Phys, Suwon 16419, South Korea

[45] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[46] Queens Univ, Dept Phys Engn Phys & Astron, Kingston, ON K7L 3N6, Canada

[47] Vrije Univ Brussel VUB, Dienst ELEM, B-1050 Brussels, Belgium

[48] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

[49] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA

[50] Catholic Univ Louvain, Ctr Cosmol Particle Phys & Phenomenol CP3, Louvain La Neuve, Belgium

来源：

ASTROPHYSICAL JOURNAL | 2022年 / 928卷 / 01期

基金：

新加坡国家研究基金会; 瑞士国家科学基金会; 澳大利亚研究理事会; 瑞典研究理事会; 美国国家科学基金会;

关键词：

SPECTRUM;

D O I：

10.3847/1538-4357/ac4d29

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a measurement of the high-energy astrophysical muon-neutrino flux with the IceCube Neutrino Observatory. The measurement uses a high-purity selection of 650k neutrino-induced muon tracks from the northern celestial hemisphere, corresponding to 9.5 yr of experimental data. With respect to previous publications, the measurement is improved by the increased size of the event sample and the extended model testing beyond simple power-law hypotheses. An updated treatment of systematic uncertainties and atmospheric background fluxes has been implemented based on recent models. The best-fit single power-law parameterization for the astrophysical energy spectrum results in a normalization of phi(nu mu+(nu) over bar mu)(@ 00TeV) = 1.441(-0.26)(+0.25 )x 10(-18) GeV(-1)cm(-2) s(-1 )sr(-1) and a spectral index gamma(SPL) = 2.37(-0.09)(+0.09), constrained in the energy range from 15 TeV to 5 PeV. The model tests include a single power law with a spectral cutoff at high energies, a log-parabola model, several source-class-specific flux predictions from the literature, and a model-independent spectral unfolding. The data are consistent with a single power-law hypothesis, however, spectra with softening above one PeV are statistically more favorable at a two-sigma level.

引用

页数：14

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