Search for PeV Gamma-Ray Emission from the Southern Hemisphere with 5 Yr of Data from the IceCube Observatory

被引:15
作者
Aartsen, M. G. [1 ]
Ackermann, M. [2 ]
Adams, J. [1 ]
Aguilar, J. A. [3 ]
Ahlers, M. [4 ]
Ahrens, M. [5 ,6 ]
Alispach, C. [7 ]
Andeen, K. [8 ]
Anderson, T. [9 ]
Ansseau, I [3 ]
Anton, G. [10 ]
Arguelles, C. [11 ]
Auffenberg, J. [12 ]
Axani, S. [11 ]
Backes, P. [12 ]
Bagherpour, H. [1 ]
Bai, X. [13 ]
Balagopal, A., V [14 ]
Barbano, A. [7 ]
Barwick, S. W. [15 ]
Bastian, B. [2 ]
Baum, V [16 ]
Baur, S. [3 ]
Bay, R. [17 ]
Beatty, J. J. [18 ,19 ,20 ]
Becker, K-H [21 ]
Tjus, J. Becker [22 ]
BenZvi, S. [23 ]
Berley, D. [24 ]
Bernardini, E. [2 ,62 ]
Besson, D. Z. [25 ,63 ]
Binder, G. [17 ,26 ]
Bindig, D. [21 ]
Blaufuss, E. [24 ]
Blot, S. [2 ]
Bohm, C. [5 ,6 ]
Boerner, M. [27 ]
Boeser, S. [16 ]
Botner, O. [28 ]
Boettcher, J. [12 ]
Bourbeau, E. [4 ]
Bourbeau, J. [29 ,30 ]
Bradascio, F. [2 ]
Braun, J. [29 ,30 ]
Bron, S. [7 ]
Brostean-Kaiser, J. [2 ]
Burgman, A. [28 ]
Buscher, J. [12 ]
Busse, R. S. [31 ]
Carver, T. [7 ]
机构
[1] Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch, New Zealand
[2] DESY, D-15738 Zeuthen, Germany
[3] Univ Libre Bruxelles, Sci Fac, CP230, B-1050 Brussels, Belgium
[4] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark
[5] Stockholm Univ, Oskar Klein Ctr, SE-10691 Stockholm, Sweden
[6] Stockholm Univ, Dept Phys, SE-10691 Stockholm, Sweden
[7] Univ Geneva, Dept Phys Nucl & Corpusculaire, CH-1211 Geneva, Switzerland
[8] Marquette Univ, Dept Phys, Milwaukee, WI 53201 USA
[9] Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA
[10] Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, D-91058 Erlangen, Germany
[11] MIT, Dept Phys, Cambridge, MA 02139 USA
[12] Rhein Westfal TH Aachen, Phys Inst 3, D-52056 Aachen, Germany
[13] South Dakota Sch Mines & Technol, Phys Dept, Rapid City, SD 57701 USA
[14] Karlsruhe Inst Technol, Inst Kernphys, D-76021 Karlsruhe, Germany
[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 Astron, Columbus, OH 43210 USA
[19] Ohio State Univ, Dept Phys, 174 W 18th Ave, Columbus, OH 43210 USA
[20] Ohio State Univ, Ctr Cosmol & Astroparticle Phys, Columbus, OH 43210 USA
[21] Univ Wuppertal, Dept Phys, D-42119 Wuppertal, Germany
[22] Ruhr Univ Bochum, Fak Phys & Astron, D-44780 Bochum, 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] Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden
[29] Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA
[30] Univ Wisconsin, Wisconsin IceCube Particle Astrophys, Madison, WI 53706 USA
[31] Westfalische Wilhelms Univ Munster, Inst Kernphys, D-48149 Munster, Germany
[32] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA
[33] Georgia Inst Technol, Ctr Relativist Astrophys, Atlanta, GA 30332 USA
[34] Sungkyunkwan Univ, Dept Phys, Suwon 16419, South Korea
[35] SNOLAB, 1039 Reg Rd 24,Creighton Mine 9, Lively, ON P3Y 1N2, Canada
[36] Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA
[37] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA
[38] Vrije Univ Brussel VUB, Dienst ELEM, B-1050 Brussels, Belgium
[39] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA
[40] Univ Ghent, Dept Phys & Astron, B-9000 Ghent, Belgium
[41] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany
[42] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA
[43] Southern Univ, Dept Phys, Baton Rouge, LA 70813 USA
[44] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA
[45] Tech Univ Munich, Phys Dept, D-85748 Garching, Germany
[46] Univ Alberta, Dept Phys, Edmonton, AB T6G 2E1, Canada
[47] Univ Adelaide, Dept Phys, Adelaide, SA 5005, Australia
[48] Chiba Univ, Dept Phys, Chiba 2638522, Japan
[49] Chiba Univ, Inst Global Prominent Res, Chiba 2638522, Japan
[50] Clark Atlanta Univ, CTSPS, Atlanta, GA 30314 USA
基金
新加坡国家研究基金会; 瑞典研究理事会; 英国科学技术设施理事会; 瑞士国家科学基金会; 加拿大自然科学与工程研究理事会; 加拿大创新基金会; 美国国家科学基金会; 澳大利亚研究理事会;
关键词
GALACTIC PLANE; DISCOVERY; COMPLEX;
D O I
10.3847/1538-4357/ab6d67
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The measurement of diffuse PeV gamma-ray emission from the Galactic plane would provide information about the energy spectrum and propagation of Galactic cosmic rays, and the detection of a pointlike source of PeV gamma-rays would be strong evidence for a Galactic source capable of accelerating cosmic rays up to at least a few PeV. This paper presents several unbinned maximum-likelihood searches for PeV gamma-rays in the Southern Hemisphere using 5 yr of data from the IceTop air shower surface detector and the in-ice array of the IceCube Observatory. The combination of both detectors takes advantage of the low muon content and deep shower maximum of gamma-ray air showers and provides excellent sensitivity to gamma-rays between similar to 0.6 and 100 PeV. Our measurements of pointlike and diffuse Galactic emission of PeV gamma-rays are consistent with the background, so we constrain the angle-integrated diffuse gamma-ray flux from the Galactic plane at 2 PeV to 2.61 x 10(-19) cm(-2) s(-1) TeV-1 at 90% confidence, assuming an E-3 spectrum, and we estimate 90% upper limits on pointlike emission at 2 PeV between 10(-21) and 10(-20) cm(-2) s(-1) TeV-1 for an E-2 spectrum, depending on decl. Furthermore, we exclude unbroken power-law emission up to 2 PeV for several TeV gamma-ray sources observed by the High Energy Spectroscopic System and calculate upper limits on the energy cutoffs of these sources at 90% confidence. We also find no PeV gamma-rays correlated with neutrinos from IceCube's high-energy starting event sample. These are currently the strongest constraints on PeV gamma-ray emission.
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页数:16
相关论文
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