Measurement of Separate Cosmic-Ray Electron and Positron Spectra with the Fermi Large Area Telescope

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MARC

Ackermann, M. (author)

Measurement of Separate Cosmic-Ray Electron and Positron Spectra with the Fermi Large Area Telescope

Article/chapterEnglish2012

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2012
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LIBRIS-ID:oai:DiVA.org:su-162437
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-162437URI
https://doi.org/10.1103/PhysRevLett.108.011103DOI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

Notes

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 GeVare consistent with a fraction that is continuing to rise with energy.

Subject headings and genre

NATURVETENSKAP Fysik hsv//swe
NATURAL SCIENCES Physical Sciences hsv//eng

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Ajello, M. (author)
Allafort, A. (author)
Atwood, W. B. (author)
Baldini, L. (author)
Barbiellini, G. (author)
Bastieri, D. (author)
Bechtol, K. (author)
Bellazzini, R. (author)
Berenji, B. (author)
Blandford, R. D. (author)
Bloom, E. D. (author)
Bonamente, E. (author)
Borgland, A. W. (author)
Bouvier, A. (author)
Bregeon, J. (author)
Brigida, M. (author)
Bruel, P. (author)
Buehler, R. (author)
Buson, S. (author)
Caliandro, G. A. (author)
Cameron, R. A. (author)
Caraveo, P. A. (author)
Casandjian, J. M. (author)
Cecchi, C. (author)
Charles, E. (author)
Chekhtman, A. (author)
Cheung, C. C. (author)
Chiang, J. (author)
Ciprini, S. (author)
Claus, R. (author)
Cohen-Tanugi, J. (author)
Conrad, Jan M.Stockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)conrad (author)
Cutini, S. (author)
de Angelis, A. (author)
de Palma, F. (author)
Dermer, C. D. (author)
Digel, S. W. (author)
do Couto e Silva, E. (author)
Drell, P. S. (author)
Drlica-Wagner, A. (author)
Favuzzi, C. (author)
Fegan, S. J. (author)
Ferrara, E. C. (author)
Focke, W. B. (author)
Fortin, P. (author)
Fukazawa, Y. (author)
Funk, S. (author)
Fusco, P. (author)
Gargano, F. (author)
Gasparrini, D. (author)
Germani, S. (author)
Giglietto, N. (author)
Giommi, P. (author)
Giordano, F. (author)
Giroletti, M. (author)
Glanzman, T. (author)
Godfrey, G. (author)
Grenier, I. A. (author)
Grove, J. E. (author)
Guiriec, S. (author)
Gustafsson, M. (author)
Hadasch, D. (author)
Harding, A. K. (author)
Hayashida, M. (author)
Hughes, R. E. (author)
Johannesson, G. (author)
Johnson, A. S. (author)
Kamae, T. (author)
Katagiri, H. (author)
Kataoka, J. (author)
Knoedlseder, J. (author)
Kuss, M. (author)
Lande, J. (author)
Latronico, L. (author)
Lemoine-Goumard, M. (author)
Garde, M. LlenaStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)mgarde (author)
Longo, F. (author)
Loparco, F. (author)
Lovellette, M. N. (author)
Lubrano, P. (author)
Madejski, G. M. (author)
Mazziotta, M. N. (author)
McEnery, J. E. (author)
Michelson, P. F. (author)
Mitthumsiri, W. (author)
Mizuno, T. (author)
Moiseev, A. A. (author)
Monte, C. (author)
Monzani, M. E. (author)
Morselli, A. (author)
Moskalenko, I. V. (author)
Murgia, S. (author)
Nakamori, T. (author)
Nolan, P. L. (author)
Norris, J. P. (author)
Nuss, E. (author)
Ohno, M. (author)
Ohsugi, T. (author)
Okumura, A. (author)
Omodei, N. (author)
Orlando, E. (author)
Ormes, J. F. (author)
Ozaki, M. (author)
Paneque, D. (author)
Parent, D. (author)
Pesce-Rollins, M. (author)
Pierbattista, M. (author)
Piron, F. (author)
Pivato, G. (author)
Porter, T. A. (author)
Raino, S. (author)
Rando, R. (author)
Razzano, M. (author)
Razzaque, S. (author)
Reimer, A. (author)
Reimer, O. (author)
Reposeur, T. (author)
Ritz, S. (author)
Romani, R. W. (author)
Roth, M. (author)
Sadrozinski, H. F. -W. (author)
Sbarra, C. (author)
Schalk, T. L. (author)
Sgro, C. (author)
Siskind, E. J. (author)
Spandre, G. (author)
Spinelli, P. (author)
Strong, A. W. (author)
Takahashi, H. (author)
Takahashi, T. (author)
Tanaka, T. (author)
Thayer, J. G. (author)
Thayer, J. B. (author)
Tibaldo, L. (author)
Tinivella, M. (author)
Torres, D. F. (author)
Tosti, G. (author)
Troja, E. (author)
Uchiyama, Y. (author)
Usher, T. L. (author)
Vandenbroucke, J. (author)
Vasileiou, V. (author)
Vianello, G. (author)
Vitale, V. (author)
Waite, A. P. (author)
Winer, B. L. (author)
Wood, K. S. (author)
Wood, M. (author)
Yang, ZhaoyuStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)zhaoyu (author)
Zimmer, StephanStockholms universitet,Fysikum,Oskar Klein-centrum för kosmopartikelfysik (OKC)(Swepub:su)stzi0820 (author)
Stockholms universitetFysikum (creator_code:org_t)

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In:Physical Review Letters108:10031-90071079-7114

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By the author/editor: Ackermann, M.; Ajello, M.; Allafort, A.; Atwood, W. B.; Baldini, L.; Barbiellini, G.; show more...; 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.; Buson, S.; Caliandro, G. A.; Cameron, R. A.; Caraveo, P. A.; Casandjian, J. M ...; Cecchi, C.; Charles, E.; Chekhtman, A.; Cheung, C. C.; Chiang, J.; Ciprini, S.; Claus, R.; Cohen-Tanugi, J.; Conrad, Jan M.; Cutini, S.; de Angelis, A.; de Palma, F.; Dermer, C. D.; Digel, S. W.; do Couto e Silva ...; Drell, P. S.; Drlica-Wagner, A ...; Favuzzi, C.; Fegan, S. J.; Ferrara, E. C.; Focke, W. B.; 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, I. A.; Grove, J. E.; Guiriec, S.; Gustafsson, M.; Hadasch, D.; Harding, A. K.; Hayashida, M.; Hughes, R. E.; Johannesson, G.; Johnson, A. S.; Kamae, T.; Katagiri, H.; Kataoka, J.; Knoedlseder, J.; Kuss, M.; Lande, J.; Latronico, L.; Lemoine-Goumard, ...; Garde, M. Llena; Longo, F.; Loparco, F.; Lovellette, M. N ...; Lubrano, P.; Madejski, G. M.; Mazziotta, M. N.; McEnery, J. E.; Michelson, P. F.; Mitthumsiri, W.; Mizuno, T.; Moiseev, A. A.; Monte, C.; Monzani, M. E.; Morselli, A.; Moskalenko, I. V ...; Murgia, S.; Nakamori, T.; Nolan, P. L.; Norris, J. P.; Nuss, E.; Ohno, M.; Ohsugi, T.; Okumura, A.; Omodei, N.; Orlando, E.; Ormes, J. F.; Ozaki, M.; Paneque, D.; Parent, D.; Pesce-Rollins, M ...; Pierbattista, M.; Piron, F.; Pivato, G.; Porter, T. A.; Raino, S.; Rando, R.; Razzano, M.; Razzaque, S.; Reimer, A.; Reimer, O.; Reposeur, T.; Ritz, S.; Romani, R. W.; Roth, M.; Sadrozinski, H. ...; Sbarra, C.; Schalk, T. L.; Sgro, C.; Siskind, E. J.; Spandre, G.; Spinelli, P.; Strong, A. W.; Takahashi, H.; Takahashi, T.; Tanaka, T.; Thayer, J. G.; Thayer, J. B.; Tibaldo, L.; Tinivella, M.; Torres, D. F.; Tosti, G.; Troja, E.; Uchiyama, Y.; Usher, T. L.; Vandenbroucke, J ...; Vasileiou, V.; Vianello, G.; Vitale, V.; Waite, A. P.; Winer, B. L.; Wood, K. S.; Wood, M.; Yang, Zhaoyu; Zimmer, Stephan; show less...

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