Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data

被引：46

作者：

Abdollahi, S. ^{[1
]}

Ackermann, M. ^{[2
]}

Ajello, M. ^{[3
]}

Albert, A. ^{[4
]}

Atwood, W. B. ^{[5
,6
]}

Baldini, L. ^{[7
,8
]}

Barbiellini, G. ^{[9
,10
]}

Bellazzini, R. ^{[8
]}

Bissaldi, E. ^{[11
,12
,13
]}

Bloom, E. D. ^{[14
,15
]}

Bonino, R. ^{[16
,17
]}

Bottacini, E. ^{[14
,15
]}

Brandt, T. J. ^{[18
]}

Bruel, P. ^{[19
]}

Buson, S. ^{[18
]}

Caragiulo, M. ^{[11
,12
,13
]}

Cavazzuti, E. ^{[20
]}

Chekhtman, A. ^{[21
,22
]}

Ciprini, S. ^{[20
,23
]}

Costanza, F. ^{[13
]}

Cuoco, A. ^{[16
,24
]}

Cutini, S. ^{[20
,23
]}

D'Ammando, F. ^{[25
,26
]}

de Palma, F. ^{[13
,27
]}

Desiante, R. ^{[16
,28
]}

Digel, S. W. ^{[14
,15
]}

Di Lalla, N. ^{[7
,8
]}

Di Mauro, M. ^{[14
,15
]}

Di Venere, L. ^{[11
,12
,13
]}

Donaggio, B. ^{[29
]}

Drell, P. S. ^{[14
,15
]}

Favuzzi, C. ^{[11
,12
,13
]}

Focke, W. B. ^{[14
,15
]}

Fukazawa, Y. ^{[1
]}

Funk, S. ^{[30
]}

Fusco, P. ^{[11
,12
,13
]}

Gargano, F. ^{[13
]}

Gasparrini, D. ^{[20
,23
]}

Giglietto, N. ^{[11
,12
,13
]}

Giordano, F. ^{[11
,12
,13
]}

Giroletti, M. ^{[25
]}

Green, D. ^{[18
,31
,32
]}

Guiriec, S. ^{[18
]}

Harding, A. K. ^{[18
]}

Jogler, T. ^{[33
]}

Johannesson, G. ^{[34
]}

Kamae, T. ^{[35
]}

Kuss, M. ^{[8
]}

Larsson, S. ^{[36
,37
]}

Latronico, L. ^{[16
]}

机构：

[1] Hiroshima Univ, Dept Phys Sci, Hiroshima 7398526, Japan

[2] Deutsch Elektronen Synchrotron DESY, D-15738 Zeuthen, Germany

[3] Clemson Univ, Dept Phys & Astron, Kinard Lab Phys, Clemson, SC 29634 USA

[4] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[5] Univ Calif Santa Cruz, Dept Phys, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA

[6] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA

[7] Univ Pisa, Dipartimento Fis Enrico Fermi, I-56126 Pisa, Italy

[8] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy

[9] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy

[10] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy

[11] Univ Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy

[12] Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy

[13] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy

[14] Stanford Univ, Dept Phys, Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA

[15] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

[16] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

[17] Univ Turin, Dipartimento Fis, I-10125 Turin, Italy

[18] NASA Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[19] Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France

[20] ASI, Sci Data Ctr, I-00133 Rome, Italy

[21] George Mason Univ, Coll Sci, Fairfax, VA 22030 USA

[22] Naval Res Lab, Washington, DC 20375 USA

[23] Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy

[24] Rhein Westfal TH Aachen, Inst Theoret Particle Phys & Cosmol, TTK, D-52056 Aachen, Germany

[25] INAF Ist Radioastron, I-40129 Bologna, Italy

[26] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy

[27] Univ Telemat Pegaso, Piazza Trieste & Trento 48, I-80132 Naples, Italy

[28] Univ Udine, I-33100 Udine, Italy

[29] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy

[30] Erlangen Ctr Astroparticle Phys, D-91058 Erlangen, Germany

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

[32] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[33] Friedrich Alexander Univ, Schlosspl 4, D-91054 Erlangen, Germany

[34] Univ Iceland, Inst Sci, IS-107 Reykjavik, Iceland

[35] Univ Tokyo, Grad Sch Sci, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan

[36] KTH Royal Inst Technol, AlbaNova, Dept Phys, SE-10691 Stockholm, Sweden

[37] AlbaNova, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden

[38] CSIC, Inst Space Sci IEEC, Campus UAB, E-08193 Barcelona, Spain

[39] Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA

[40] Mahidol Univ, Dept Phys, Fac Sci, Bangkok 10400, Thailand

[41] Hiroshima Univ, Hiroshima Astrophys Sci Ctr, Hiroshima 7398526, Japan

[42] CRESST, Greenbelt, MD 20771 USA

[43] Ist Nazl Fis Nucl, Sez Roma Tor Vergata, I-00133 Rome, Italy

[44] Univ Montpellier, IN2P3, CNRS, Lab Univers & Particules Montpellier, F-34095 Montpellier, France

[45] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany

[46] Univ Padua, Dipartimento Fis & Astron G Galilei, I-35131 Padua, Italy

[47] Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria

[48] Leopold Franzens Univ Innsbruck, Inst Theoret Phys, A-6020 Innsbruck, Austria

[49] NYCB Real Time Comp Inc, Lattingtown, NY 11560 USA

[50] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 118卷 / 09期

基金：

美国国家航空航天局; 瑞典研究理事会;

关键词：

32;

D O I：

10.1103/PhysRevLett.118.091103

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The Large Area Telescope on board the Fermi Gamma-ray Space Telescope has collected the largest ever sample of high-energy cosmic-ray electron and positron events since the beginning of its operation. Potential anisotropies in the arrival directions of cosmic-ray electrons or positrons could be a signature of the presence of nearby sources. We use almost seven years of data with energies above 42 GeV processed with the Pass 8 reconstruction. The present data sample can probe dipole anisotropies down to a level of 10(-3). We take into account systematic effects that could mimic true anisotropies at this level. We present a detailed study of the event selection optimization of the cosmic-ray electrons and positrons to be used for anisotropy searches. Since no significant anisotropies have been detected on any angular scale, we present upper limits on the dipole anisotropy. The present constraints are among the strongest to date probing the presence of nearby young and middle-aged sources.

引用

页数：7

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