Measurement of separate cosmic-ray electron and positron spectra with the fermi large area telescope

M. Ackermann; M. Ajello; A. Allafort; W. B. Atwood; L. Baldini; G. Barbiellini; D. Bastieri; K. Bechtol; R. Bellazzini; B. Berenji; R. D. Blandford; E. D. Bloom; E. Bonamente; A. W. Borgland; A. Bouvier; J. Bregeon; M. Brigida; P. Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; J. M. Casandjian; C. Cecchi; E. Charles; A. Chekhtman; C. C. Cheung; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; J. Conrad; S. Cutini; A. De Angelis; F. De Palma; C. D. Dermer; S. W. Digel; E. Do Couto E Silva; P. S. Drell; A. Drlica-Wagner; C. Favuzzi; S. J. Fegan; E. C. Ferrara; W. B. Focke; P. Fortin; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; S. Germani; N. Giglietto; P. Giommi; F. Giordano; M. Giroletti; T. Glanzman; G. Godfrey; I. A. Grenier; J. E. Grove; S. Guiriec; M. Gustafsson; D. Hadasch; A. K. Harding; M. Hayashida; R. E. Hughes; G. Jóhannesson; A. S. Johnson; T. Kamae; H. Katagiri; J. Kataoka; J. Knödlseder; M. Kuss; J. Lande; L. Latronico; M. Lemoine-Goumard; M. Llena Garde; F. Longo; F. Loparco; M. N. Lovellette; P. Lubrano; G. M. Madejski; M. N. Mazziotta; J. E. McEnery; P. F. Michelson; W. Mitthumsiri; T. Mizuno; A. A. Moiseev; C. Monte; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; T. Nakamori; P. L. Nolan; J. P. Norris; E. Nuss; M. Ohno; T. Ohsugi; A. Okumura; N. Omodei; E. Orlando; J. F. Ormes; M. Ozaki; D. Paneque; D. Parent; M. Pesce-Rollins; M. Pierbattista; F. Piron; G. Pivato; T. A. Porter; S. Rainò; R. Rando; M. Razzano; S. Razzaque; A. Reimer; O. Reimer; T. Reposeur; S. Ritz; R. W. Romani; M. Roth; H. F.W. Sadrozinski; C. Sbarra; T. L. Schalk; C. Sgrò; E. J. Siskind; G. Spandre; P. Spinelli; A. W. Strong; H. Takahashi; T. Takahashi; T. Tanaka; J. G. Thayer; J. B. Thayer; L. Tibaldo; M. Tinivella; D. F. Torres; G. Tosti; E. Troja; Y. Uchiyama; T. L. Usher; J. Vandenbroucke; V. Vasileiou; G. Vianello; V. Vitale; A. P. Waite; B. L. Winer; K. S. Wood; M. Wood; Z. Yang; S. Zimmer

doi:10.1103/PhysRevLett.108.011103

Measurement of separate cosmic-ray electron and positron spectra with the fermi large area telescope

M. Ackermann
, M. Ajello
, A. Allafort
, W. B. Atwood
, L. Baldini
, G. Barbiellini
, D. Bastieri
, K. Bechtol
, R. Bellazzini
, B. Berenji
, R. D. Blandford
, E. D. Bloom
, E. Bonamente
, A. W. Borgland
, A. Bouvier
, J. Bregeon
, M. Brigida
, P. Bruel
, R. Buehler
, S. Buson

G. A. Caliandro, R. A. Cameron, P. A. Caraveo, J. M. Casandjian, C. Cecchi, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, S. Cutini, A. De Angelis, F. De Palma, C. D. Dermer, S. W. Digel, E. Do Couto E Silva, P. S. Drell, A. Drlica-Wagner, C. Favuzzi, S. J. Fegan, E. C. Ferrara, W. B. Focke, P. Fortin, Y. Fukazawa, S. Funk, P. Fusco, F. Gargano, D. Gasparrini, S. Germani, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, I. A. Grenier, J. E. Grove, S. Guiriec, M. Gustafsson, D. Hadasch, A. K. Harding, M. Hayashida, R. E. Hughes, G. Jóhannesson, A. S. Johnson, T. Kamae, H. Katagiri, J. Kataoka, J. Knödlseder, M. Kuss, J. Lande, L. Latronico, M. Lemoine-Goumard, M. Llena Garde, F. Longo, F. Loparco, M. N. Lovellette, P. Lubrano, G. M. Madejski, M. N. Mazziotta, J. E. McEnery, P. F. Michelson, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, T. Nakamori, P. L. Nolan, J. P. Norris, E. Nuss, M. Ohno, T. Ohsugi, A. Okumura, N. Omodei, E. Orlando, J. F. Ormes, M. Ozaki, D. Paneque, D. Parent, M. Pesce-Rollins, M. Pierbattista, F. Piron, G. Pivato, T. A. Porter, S. Rainò, R. Rando, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, T. Reposeur, S. Ritz, R. W. Romani, M. Roth, H. F.W. Sadrozinski, C. Sbarra, T. L. Schalk, C. Sgrò, E. J. Siskind, G. Spandre, P. Spinelli, A. W. Strong, H. Takahashi, T. Takahashi, T. Tanaka, J. G. Thayer, J. B. Thayer, L. Tibaldo, M. Tinivella, D. F. Torres, G. Tosti, E. Troja, Y. Uchiyama, T. L. Usher, J. Vandenbroucke, V. Vasileiou, G. Vianello, V. Vitale, A. P. Waite, B. L. Winer, K. S. Wood, M. Wood, Z. Yang, S. Zimmer

c/o DESY
Kavli Institute for Particle Astrophysics and Cosmology
University of California at Santa Cruz
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
INFN Sezione di Trieste
University of Trieste
INFN
University of Padova
INFN Sezione di Perugia
University of Perugia
Politecnico di Bari
INFN Sezione di Bari
Campus UAB
INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, Milan
Universite Paris-Saclay
Artep Inc.
Naval Research Laboratory
National Research Council
ASI Science Data Center
Laboratoire Univers et Particules de Montpellier
Stockholm University
Oskar Klein Centre
Science and Research Directorate
and Physics University of Udine
NASA Goddard Space Flight Center
Hiroshima University
INAF Istituto di Radioastronomia
Center for Space Plasma and Aeronomic Research
Kyoto University
The Ohio State University
University of Iceland
Ibaraki University
Waseda University
IRAP/CNRS
INFN Sezione di Torino
Univ. Bordeaux
University of Maryland
Sezione di Roma
Boise State University
ISAS/JAXA
Max Planck Institut für Extraterrestrische Physik
University of Denver
Max-Planck-Institut für Physik
George Mason University
Medical University of Innsbruck
University of Washington
NYCB Real-Time Computing Inc.
Pompeu Fabra University (UPF)
Consorzio Interuniversitario per la Fisica Spaziale (CIFS)
University of Rome “Tor Vergata”

Research output: Contribution to journal › Article › peer-review

Abstract

We measured separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope. Because the instrument does not have an onboard magnet, we distinguish the two species by exploiting Earth's shadow, which is offset in opposite directions for opposite charges due to Earth's magnetic field. We estimate and subtract the cosmic-ray proton background using two different methods that produce consistent results. We report the electron-only spectrum, the positron-only spectrum, and the positron fraction between 20 and 200 GeV. We confirm that the fraction rises with energy in the 20-100 GeV range. The three new spectral points between 100 and 200 GeV are consistent with a fraction that is continuing to rise with energy.

Original language	English
Article number	011103
Journal	Physical Review Letters
Volume	108
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevLett.108.011103
Publication status	Published - 5 Jan 2012

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10.1103/PhysRevLett.108.011103

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Ackermann, M., Ajello, M., Allafort, A., Atwood, W. B., Baldini, L., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bouvier, A., Bregeon, J., Brigida, M., Bruel, P., Buehler, R., ... Zimmer, S. (2012). Measurement of separate cosmic-ray electron and positron spectra with the fermi large area telescope. Physical Review Letters, 108(1), Article 011103. https://doi.org/10.1103/PhysRevLett.108.011103

@article{cbb8d885c75549dba49509e06132aaf8,

title = "Measurement of separate cosmic-ray electron and positron spectra with the fermi large area telescope",

abstract = "We measured separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope. Because the instrument does not have an onboard magnet, we distinguish the two species by exploiting Earth's shadow, which is offset in opposite directions for opposite charges due to Earth's magnetic field. We estimate and subtract the cosmic-ray proton background using two different methods that produce consistent results. We report the electron-only spectrum, the positron-only spectrum, and the positron fraction between 20 and 200 GeV. We confirm that the fraction rises with energy in the 20-100 GeV range. The three new spectral points between 100 and 200 GeV are consistent with a fraction that is continuing to rise with energy.",

author = "M. Ackermann and M. Ajello and A. Allafort and Atwood, \{W. B.\} and L. Baldini and G. Barbiellini and D. Bastieri and K. Bechtol and R. Bellazzini and B. Berenji and Blandford, \{R. D.\} and Bloom, \{E. D.\} and E. Bonamente and Borgland, \{A. W.\} and A. Bouvier and J. Bregeon and M. Brigida and P. Bruel and R. Buehler and S. Buson and Caliandro, \{G. A.\} and Cameron, \{R. A.\} and Caraveo, \{P. A.\} and Casandjian, \{J. M.\} and C. Cecchi and E. Charles and A. Chekhtman and Cheung, \{C. C.\} and J. Chiang and S. Ciprini and R. Claus and J. Cohen-Tanugi and J. Conrad and S. Cutini and \{De Angelis\}, A. and \{De Palma\}, F. and Dermer, \{C. D.\} and Digel, \{S. W.\} and \{Do Couto E Silva\}, E. and Drell, \{P. S.\} and A. Drlica-Wagner and C. Favuzzi and Fegan, \{S. J.\} and Ferrara, \{E. C.\} and Focke, \{W. B.\} and P. Fortin and Y. Fukazawa and S. Funk and P. Fusco and F. Gargano and D. Gasparrini and S. Germani and N. Giglietto and P. Giommi and F. Giordano and M. Giroletti and T. Glanzman and G. Godfrey and Grenier, \{I. A.\} and Grove, \{J. E.\} and S. Guiriec and M. Gustafsson and D. Hadasch and Harding, \{A. K.\} and M. Hayashida and Hughes, \{R. E.\} and G. J{\'o}hannesson and Johnson, \{A. S.\} and T. Kamae and H. Katagiri and J. Kataoka and J. Kn{\"o}dlseder and M. Kuss and J. Lande and L. Latronico and M. Lemoine-Goumard and \{Llena Garde\}, M. and F. Longo and F. Loparco and Lovellette, \{M. N.\} and P. Lubrano and Madejski, \{G. M.\} and Mazziotta, \{M. N.\} and McEnery, \{J. E.\} and Michelson, \{P. F.\} and W. Mitthumsiri and T. Mizuno and Moiseev, \{A. A.\} and C. Monte and Monzani, \{M. E.\} and A. Morselli and Moskalenko, \{I. V.\} and S. Murgia and T. Nakamori and Nolan, \{P. L.\} and Norris, \{J. P.\} and E. Nuss and M. Ohno and T. Ohsugi and A. Okumura and N. Omodei and E. Orlando and Ormes, \{J. F.\} and M. Ozaki and D. Paneque and D. Parent and M. Pesce-Rollins and M. Pierbattista and F. Piron and G. Pivato and Porter, \{T. A.\} and S. Rain{\`o} and R. Rando and M. Razzano and S. Razzaque and A. Reimer and O. Reimer and T. Reposeur and S. Ritz and Romani, \{R. W.\} and M. Roth and Sadrozinski, \{H. F.W.\} and C. Sbarra and Schalk, \{T. L.\} and C. Sgr{\`o} and Siskind, \{E. J.\} and G. Spandre and P. Spinelli and Strong, \{A. W.\} and H. Takahashi and T. Takahashi and T. Tanaka and Thayer, \{J. G.\} and Thayer, \{J. B.\} and L. Tibaldo and M. Tinivella and Torres, \{D. F.\} and G. Tosti and E. Troja and Y. Uchiyama and Usher, \{T. L.\} and J. Vandenbroucke and V. Vasileiou and G. Vianello and V. Vitale and Waite, \{A. P.\} and Winer, \{B. L.\} and Wood, \{K. S.\} and M. Wood and Z. Yang and S. Zimmer",

year = "2012",

month = jan,

day = "5",

doi = "10.1103/PhysRevLett.108.011103",

language = "English",

volume = "108",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "1",

}

Ackermann, M, Ajello, M, Allafort, A, Atwood, WB, Baldini, L, Barbiellini, G, Bastieri, D, Bechtol, K, Bellazzini, R, Berenji, B, Blandford, RD, Bloom, ED, Bonamente, E, Borgland, AW, Bouvier, A, Bregeon, J, Brigida, M, Bruel, P, Buehler, R, Buson, S, Caliandro, GA, Cameron, RA, Caraveo, PA, Casandjian, JM, Cecchi, C, Charles, E, Chekhtman, A, Cheung, CC, Chiang, J, Ciprini, S, Claus, R, Cohen-Tanugi, J, Conrad, J, Cutini, S, De Angelis, A, De Palma, F, Dermer, CD, Digel, SW, Do Couto E Silva, E, Drell, PS, Drlica-Wagner, A, Favuzzi, C, Fegan, SJ, Ferrara, EC, Focke, WB, Fortin, P, Fukazawa, Y, Funk, S, Fusco, P, Gargano, F, Gasparrini, D, Germani, S, Giglietto, N, Giommi, P, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grenier, IA, Grove, JE, Guiriec, S, Gustafsson, M, Hadasch, D, Harding, AK, Hayashida, M, Hughes, RE, Jóhannesson, G, Johnson, AS, Kamae, T, Katagiri, H, Kataoka, J, Knödlseder, J, Kuss, M, Lande, J, Latronico, L, Lemoine-Goumard, M, Llena Garde, M, Longo, F, Loparco, F, Lovellette, MN, Lubrano, P, Madejski, GM, Mazziotta, MN, McEnery, JE, Michelson, PF, Mitthumsiri, W, Mizuno, T, Moiseev, AA, Monte, C, Monzani, ME, Morselli, A, Moskalenko, IV, Murgia, S, Nakamori, T, Nolan, PL, Norris, JP, Nuss, E, Ohno, M, Ohsugi, T, Okumura, A, Omodei, N, Orlando, E, Ormes, JF, Ozaki, M, Paneque, D, Parent, D, Pesce-Rollins, M, Pierbattista, M, Piron, F, Pivato, G, Porter, TA, Rainò, S, Rando, R, Razzano, M, Razzaque, S, Reimer, A, Reimer, O, Reposeur, T, Ritz, S, Romani, RW, Roth, M, Sadrozinski, HFW, Sbarra, C, Schalk, TL, Sgrò, C, Siskind, EJ, Spandre, G, Spinelli, P, Strong, AW, Takahashi, H, Takahashi, T, Tanaka, T, Thayer, JG, Thayer, JB, Tibaldo, L, Tinivella, M, Torres, DF, Tosti, G, Troja, E, Uchiyama, Y, Usher, TL, Vandenbroucke, J, Vasileiou, V, Vianello, G, Vitale, V, Waite, AP, Winer, BL, Wood, KS, Wood, M, Yang, Z & Zimmer, S 2012, 'Measurement of separate cosmic-ray electron and positron spectra with the fermi large area telescope', Physical Review Letters, vol. 108, no. 1, 011103. https://doi.org/10.1103/PhysRevLett.108.011103

TY - JOUR

T1 - Measurement of separate cosmic-ray electron and positron spectra with the fermi large area telescope

AU - Ackermann, M.

AU - Ajello, M.

AU - Allafort, A.

AU - Atwood, W. B.

AU - Baldini, L.

AU - Barbiellini, G.

AU - Bastieri, D.

AU - Bechtol, K.

AU - Bellazzini, R.

AU - Berenji, B.

AU - Blandford, R. D.

AU - Bloom, E. D.

AU - Bonamente, E.

AU - Borgland, A. W.

AU - Bouvier, A.

AU - Bregeon, J.

AU - Brigida, M.

AU - Bruel, P.

AU - Buehler, R.

AU - Buson, S.

AU - Caliandro, G. A.

AU - Cameron, R. A.

AU - Caraveo, P. A.

AU - Casandjian, J. M.

AU - Cecchi, C.

AU - Charles, E.

AU - Chekhtman, A.

AU - Cheung, C. C.

AU - Chiang, J.

AU - Ciprini, S.

AU - Claus, R.

AU - Cohen-Tanugi, J.

AU - Conrad, J.

AU - Cutini, S.

AU - De Angelis, A.

AU - De Palma, F.

AU - Dermer, C. D.

AU - Digel, S. W.

AU - Do Couto E Silva, E.

AU - Drell, P. S.

AU - Drlica-Wagner, A.

AU - Favuzzi, C.

AU - Fegan, S. J.

AU - Ferrara, E. C.

AU - Focke, W. B.

AU - Fortin, P.

AU - Fukazawa, Y.

AU - Funk, S.

AU - Fusco, P.

AU - Gargano, F.

AU - Gasparrini, D.

AU - Germani, S.

AU - Giglietto, N.

AU - Giommi, P.

AU - Giordano, F.

AU - Giroletti, M.

AU - Glanzman, T.

AU - Godfrey, G.

AU - Grenier, I. A.

AU - Grove, J. E.

AU - Guiriec, S.

AU - Gustafsson, M.

AU - Hadasch, D.

AU - Harding, A. K.

AU - Hayashida, M.

AU - Hughes, R. E.

AU - Jóhannesson, G.

AU - Johnson, A. S.

AU - Kamae, T.

AU - Katagiri, H.

AU - Kataoka, J.

AU - Knödlseder, J.

AU - Kuss, M.

AU - Lande, J.

AU - Latronico, L.

AU - Lemoine-Goumard, M.

AU - Llena Garde, M.

AU - Longo, F.

AU - Loparco, F.

AU - Lovellette, M. N.

AU - Lubrano, P.

AU - Madejski, G. M.

AU - Mazziotta, M. N.

AU - McEnery, J. E.

AU - Michelson, P. F.

AU - Mitthumsiri, W.

AU - Mizuno, T.

AU - Moiseev, A. A.

AU - Monte, C.

AU - Monzani, M. E.

AU - Morselli, A.

AU - Moskalenko, I. V.

AU - Murgia, S.

AU - Nakamori, T.

AU - Nolan, P. L.

AU - Norris, J. P.

AU - Nuss, E.

AU - Ohno, M.

AU - Ohsugi, T.

AU - Okumura, A.

AU - Omodei, N.

AU - Orlando, E.

AU - Ormes, J. F.

AU - Ozaki, M.

AU - Paneque, D.

AU - Parent, D.

AU - Pesce-Rollins, M.

AU - Pierbattista, M.

AU - Piron, F.

AU - Pivato, G.

AU - Porter, T. A.

AU - Rainò, S.

AU - Rando, R.

AU - Razzano, M.

AU - Razzaque, S.

AU - Reimer, A.

AU - Reimer, O.

AU - Reposeur, T.

AU - Ritz, S.

AU - Romani, R. W.

AU - Roth, M.

AU - Sadrozinski, H. F.W.

AU - Sbarra, C.

AU - Schalk, T. L.

AU - Sgrò, C.

AU - Siskind, E. J.

AU - Spandre, G.

AU - Spinelli, P.

AU - Strong, A. W.

AU - Takahashi, H.

AU - Takahashi, T.

AU - Tanaka, T.

AU - Thayer, J. G.

AU - Thayer, J. B.

AU - Tibaldo, L.

AU - Tinivella, M.

AU - Torres, D. F.

AU - Tosti, G.

AU - Troja, E.

AU - Uchiyama, Y.

AU - Usher, T. L.

AU - Vandenbroucke, J.

AU - Vasileiou, V.

AU - Vianello, G.

AU - Vitale, V.

AU - Waite, A. P.

AU - Winer, B. L.

AU - Wood, K. S.

AU - Wood, M.

AU - Yang, Z.

AU - Zimmer, S.

PY - 2012/1/5

Y1 - 2012/1/5

N2 - We measured separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope. Because the instrument does not have an onboard magnet, we distinguish the two species by exploiting Earth's shadow, which is offset in opposite directions for opposite charges due to Earth's magnetic field. We estimate and subtract the cosmic-ray proton background using two different methods that produce consistent results. We report the electron-only spectrum, the positron-only spectrum, and the positron fraction between 20 and 200 GeV. We confirm that the fraction rises with energy in the 20-100 GeV range. The three new spectral points between 100 and 200 GeV are consistent with a fraction that is continuing to rise with energy.

AB - We measured separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope. Because the instrument does not have an onboard magnet, we distinguish the two species by exploiting Earth's shadow, which is offset in opposite directions for opposite charges due to Earth's magnetic field. We estimate and subtract the cosmic-ray proton background using two different methods that produce consistent results. We report the electron-only spectrum, the positron-only spectrum, and the positron fraction between 20 and 200 GeV. We confirm that the fraction rises with energy in the 20-100 GeV range. The three new spectral points between 100 and 200 GeV are consistent with a fraction that is continuing to rise with energy.

UR - https://www.scopus.com/pages/publications/84860117875

U2 - 10.1103/PhysRevLett.108.011103

DO - 10.1103/PhysRevLett.108.011103

M3 - Article

AN - SCOPUS:84860117875

SN - 0031-9007

VL - 108

JO - Physical Review Letters

JF - Physical Review Letters

IS - 1

M1 - 011103

ER -

Measurement of separate cosmic-ray electron and positron spectra with the fermi large area telescope

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