Search for Astrophysical Sources of Neutrinos Using Cascade Events in IceCube

被引：29

作者：

Aartsen, M. G. ^{[1
]}

Ackermann, M. ^{[2
]}

Adams, J. ^{[3
]}

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

Ahlers, M. ^{[5
]}

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

Al Samarai, I. ^{[8
]}

Altmann, D. ^{[9
]}

Andeen, K. ^{[10
]}

Anderson, T. ^{[11
]}

Ansseau, I. ^{[4
]}

Anton, G. ^{[9
]}

Arguelles, C. ^{[12
]}

Auffenberg, J. ^{[13
]}

Axani, S. ^{[12
]}

Bagherpour, H. ^{[3
]}

Bai, X. ^{[14
]}

Barwick, S. W. ^{[15
]}

Baum, V. ^{[16
]}

Bay, R. ^{[17
]}

Beatty, J. J. ^{[18
,19
,20
]}

Tjus, J. Becker ^{[21
]}

Becker, K. -H. ^{[22
]}

BenZvi, S. ^{[23
]}

Berley, D. ^{[24
]}

Bernardini, E. ^{[2
]}

Besson, D. Z. ^{[25
]}

Binder, G. ^{[17
,26
]}

Bindig, D. ^{[22
]}

Blaufuss, E. ^{[24
]}

Blot, S. ^{[2
]}

Bohm, C. ^{[6
,7
]}

Borner, M. ^{[27
]}

Bos, F. ^{[21
]}

Bose, D. ^{[28
]}

Boser, S. ^{[16
]}

Botner, O. ^{[29
]}

Bourbeau, J. ^{[30
,31
]}

Bradascio, F. ^{[2
]}

Braun, J. ^{[30
,31
]}

Brayeur, L. ^{[32
]}

Brenzke, M. ^{[13
]}

Bretz, H. -P. ^{[2
]}

Bron, S. ^{[8
]}

Burgman, A. ^{[16
,29
]}

Carver, T. ^{[8
]}

Casey, J. ^{[30
,31
]}

Casier, M. ^{[32
]}

Cheung, E. ^{[24
]}

Chirkin, D. ^{[30
,31
]}

机构：

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

[2] DESY, D-15735 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] Univ Geneva, Dept Phys Nucl & Corpusculaire, CH-1211 Geneva, Switzerland

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[28] Sungkyunkwan Univ, Dept Phys, Suwon 440746, South Korea

[29] Uppsala Univ, Dept Phys & Astron, Box 516, SE-75120 Uppsala, Sweden

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

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

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

[33] SNOLAB, 1039 Reg Rd 24, Lively, ON P3Y IN2, Canada

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

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

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

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

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

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

[40] Univ Ghent, Dept Phys & Astron, B-9000 Ghent, Belgium

[41] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany

[42] Southern Univ, Dept Phys, Baton Rouge, LA 70813 USA

[43] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA

[44] Univ Alberta, Dept Phys, Edmonton, AB T6G 2E1, Canada

[45] Univ Tokyo, Earthquake Res Inst, Bunkyo Ku, Tokyo 1130032, Japan

[46] Chiba Univ, Dept Phys, Chiba 2638522, Japan

[47] Chiba Univ, Inst Global Prominent Res, Chiba 2638522, Japan

[48] Clark Atlanta Univ, CTSPS, Atlanta, GA 30314 USA

[49] Univ Texas Arlington, Dept Phys, 502 Yates St,Sci Hall Rm 108,Box 19059, Arlington, TX 76019 USA

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

来源：

ASTROPHYSICAL JOURNAL | 2017年 / 846卷 / 02期

基金：

美国国家科学基金会; 澳大利亚研究理事会; 瑞典研究理事会; 新加坡国家研究基金会; 加拿大自然科学与工程研究理事会; 瑞士国家科学基金会;

关键词：

astroparticle physics; neutrinos; PERFORMANCE; ICE;

D O I：

10.3847/1538-4357/aa8508

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The IceCube neutrino observatory has established the existence of a flux of high-energy astrophysical neutrinos, which is inconsistent with the expectation from atmospheric backgrounds at a significance greater than 5 sigma. This flux has been observed in analyses of both track events from muon neutrino interactions and cascade events from interactions of all neutrino flavors. Searches for astrophysical neutrino sources have focused on track events due to the significantly better angular resolution of track reconstructions. To date, no such sources have been confirmed. Here we present the first search for astrophysical neutrino sources using cascades interacting in IceCube with deposited energies as small as 1 TeV. No significant clustering was observed in a selection of 263 cascades collected from 2010 May to 2012 May. We show that compared to the classic approach using tracks, this statistically independent search offers improved sensitivity to sources in the southern sky, especially if the emission is spatially extended or follows a soft energy spectrum. This enhancement is due to the low background from atmospheric neutrinos forming cascade events and the additional veto of atmospheric neutrinos at declinations less than or similar to-30 degrees.

引用

页数：12

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