Search for neutrino emission from cores of active galactic nuclei

被引:21
作者
Abbasi, R. [20 ]
Ackermann, M. [68 ]
Adams, J. [21 ]
Aguilar, J. A. [13 ]
Ahlers, M. [26 ]
Ahrens, M. [57 ,58 ]
Alameddine, J. M. [27 ]
Alispach, C. [32 ]
Alves, A. A., Jr. [35 ]
Amin, N. M. [48 ,49 ]
Andeen, K. [46 ]
Anderson, T. [65 ]
Anton, G. [30 ]
Arguelles, C. [15 ,16 ]
Ashida, Y. [43 ,44 ]
Axani, S. [17 ]
Bai, X. [53 ]
Balagopal, A. [43 ,44 ]
Barbano, A. [32 ]
Barwick, S. W. [34 ]
Bastian, B. [68 ]
Basu, V [43 ,44 ]
Baur, S. [13 ]
Bay, R. [9 ]
Beatty, J. J. [23 ,24 ,25 ]
Becker, K-H [67 ]
Tjus, J. Becker [12 ]
Bellenghi, C. [31 ]
BenZvi, S. [55 ]
Berley, D. [22 ]
Bernardini, E. [68 ,69 ]
Besson, D. Z. [38 ]
Binder, G. [9 ,10 ]
Bindig, D. [67 ]
Blaufuss, E. [22 ]
Blot, S. [68 ]
Boddenberg, M. [1 ]
Bontempo, F. [35 ]
Borowka, J. [1 ]
Boser, S. [45 ]
Botner, O. [66 ]
Bottcher, J. [1 ]
Bourbeau, E. [26 ]
Bradascio, F. [68 ]
Braun, J. [43 ,44 ]
Brinson, B. [6 ,7 ]
Bron, S. [32 ]
Brostean-Kaiser, J. [68 ]
Browne, S. [36 ]
Burgman, A. [66 ]
机构
[1] Rhein Westfal TH Aachen, Phys Inst 2, D-52056 Aachen, Germany
[2] Univ Adelaide, Dept Phys, Adelaide, SA 5005, Australia
[3] Univ Alaska Anchorage, Dept Phys & Astron, 3211 Providence Dr, Anchorage, AK 99508 USA
[4] Univ Texas Arlington, Dept Phys, 502 Yates St,Sci Hall Rm 108,Box 19059, Arlington, TX 76019 USA
[5] Clark Atlanta Univ, CTSPS, Atlanta, GA 30314 USA
[6] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA
[7] Georgia Inst Technol, Ctr Relativist Astrophys, Atlanta, GA 30332 USA
[8] Southern Univ, Dept Phys, Baton Rouge, LA 70813 USA
[9] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[10] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA
[11] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany
[12] Ruhr Univ Bochum, Fak Phys & Astron, D-44780 Bochum, Germany
[13] Univ Libre Bruxelles, Sci Fac, CP230, B-1050 Brussels, Belgium
[14] Vrije Univ Brussel VUB, Dienst ELEM, B-1050 Brussels, Belgium
[15] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA
[16] Harvard Univ, Lab Particle Phys & Cosmol, Cambridge, MA 02138 USA
[17] MIT, Dept Phys, Cambridge, MA 02139 USA
[18] Chiba Univ, Dept Phys, Chiba 2638522, Japan
[19] Chiba Univ, Inst Global Prominent Res, Chiba 2638522, Japan
[20] Loyola Univ Chicago, Dept Phys, Chicago, IL 60660 USA
[21] Univ Canterbury, Dept Phys & Astron, Private Bag 4800, Christchurch, New Zealand
[22] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[23] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA
[24] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA
[25] Ohio State Univ, Ctr Cosmol & Astroparticle Phys, Columbus, OH 43210 USA
[26] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark
[27] TU Dortmund Univ, Dept Phys, D-44221 Dortmund, Germany
[28] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA
[29] Univ Alberta, Dept Phys, Edmonton, AB T6G 2E1, Canada
[30] Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, D-91058 Erlangen, Germany
[31] Tech Univ Munich, Phys Dept, D-85748 Garching, Germany
[32] Univ Geneva, Dept Phys Nucl & Corpusculaire, CH-1211 Geneva, Switzerland
[33] Univ Ghent, Dept Phys & Astron, B-9000 Ghent, Belgium
[34] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
[35] Karlsruhe Inst Technol, Inst Astroparticle Phys, D-76021 Karlsruhe, Germany
[36] Karlsruhe Inst Technol, Inst Expt Particle Phys, D-76021 Karlsruhe, Germany
[37] Queens Univ, Dept Phys Engn Phys & Astron, Kingston, ON K7L 3N6, Canada
[38] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA
[39] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[40] Catholic Univ Louvain, Ctr Cosmol Particle Phys & Phenomenol CP3, Louvain La Neuve, Belgium
[41] Mercer Univ, Dept Phys, Macon, GA 31207 USA
[42] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA
[43] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[44] Univ Wisconsin, Wisconsin IceCube Particle Astrophys Ctr, Madison, WI 53706 USA
[45] Johannes Gutenberg Univ Mainz, Inst Phys, Staudinger Weg 7, D-55099 Mainz, Germany
[46] Marquette Univ, Dept Phys, Milwaukee, WI 53201 USA
[47] Westfalische Wilhelms Univ Munster, Inst Kernphys, D-48149 Munster, Germany
[48] Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA
[49] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA
[50] Yale Univ, Dept Phys, New Haven, CT 06520 USA
关键词
HIGH-ENERGY NEUTRINOS; GAMMA-RAY; LUMINOSITY; EVOLUTION; QUASARS; ICECUBE; MODEL; FLUX; AGN;
D O I
10.1103/PhysRevD.106.022005
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The sources of the majority of the high-energy astrophysical neutrinos observed with the IceCube neutrino telescope at the South Pole are unknown. So far, only a flaring gamma-ray blazar was compellingly associated with the emission of high-energy neutrinos. However, several studies suggest that the neutrino emission from the gamma-ray blazar population only accounts for a small fraction of the total astrophysical neutrino flux. In this work we probe the production of high-energy neutrinos in the cores of active galactic nuclei (AGN), induced by accelerated cosmic rays in the accretion disk region. We present a likelihood analysis based on eight years of IceCube data, searching for a cumulative neutrino signal from three AGN samples created for this work. The neutrino emission is assumed to be proportional to the accretion disk luminosity estimated from the soft x-ray flux. Next to the observed soft x-ray flux, the objects for the three samples have been selected based on their radio emission and infrared color properties. For the largest sample in this search, an excess of high-energy neutrino events with respect to an isotropic background of atmospheric and astrophysical neutrinos is found, corresponding to a post-trial significance of 2.60 sigma. If interpreted as a genuine signal with the assumptions of a proportionality of x-ray and neutrino fluxes and a model for the subthreshold flux distribution, then this observation implies that at 100 TeV, 27%-100% of the observed neutrinos arise from particle acceleration in the core of AGN at 1 sigma confidence interval.
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页数:14
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