Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV

M. Ackermann; M. Ajello; W. B. Atwood; L. Baldini; J. Ballet; G. Barbiellini; D. Bastieri; B. M. Baughman; K. Bechtol; F. Bellardi; R. Bellazzini; F. Belli; B. Berenji; R. D. Blandford; E. D. Bloom; J. R. Bogart; E. Bonamente; A. W. Borgland; T. J. Brandt; J. Bregeon; A. Brez; M. Brigida; P. Bruel; R. Buehler; T. H. Burnett; G. Busetto; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; P. Carlson; S. Carrigan; J. M. Casandjian; M. Ceccanti; C. Cecchi; Ö Çelik; E. Charles; A. Chekhtman; C. C. Cheung; J. Chiang; A. N. Cillis; S. Ciprini; R. Claus; J. Cohen-Tanugi; J. Conrad; R. Corbet; M. Deklotz; C. D. Dermer; A. De Angelis; F. De Palma; S. W. Digel; G. Di Bernardo; E. Do Couto E Silva; P. S. Drell; A. Drlica-Wagner; R. Dubois; D. Fabiani; C. Favuzzi; S. J. Fegan; P. Fortin; Y. Fukazawa; S. Funk; P. Fusco; D. Gaggero; F. Gargano; D. Gasparrini; N. Gehrels; S. Germani; N. Giglietto; P. Giommi; F. Giordano; M. Giroletti; T. Glanzman; G. Godfrey; D. Grasso; I. A. Grenier; M. H. Grondin; J. E. Grove; S. Guiriec; M. Gustafsson; D. Hadasch; A. K. Harding; M. Hayashida; E. Hays; D. Horan; R. E. Hughes; G. Jóhannesson; A. S. Johnson; R. P. Johnson; W. N. Johnson; T. Kamae; H. Katagiri; J. Kataoka; M. Kerr; J. Knödlseder; M. Kuss; J. Lande; L. Latronico; M. Lemoine-Goumard; M. Llena Garde; F. Longo; F. Loparco; B. Lott; M. N. Lovellette; P. Lubrano; A. Makeev; M. N. Mazziotta; J. E. McEnery; J. Mehault; P. F. Michelson; M. Minuti; W. Mitthumsiri; T. Mizuno; A. A. Moiseev; C. Monte; M. E. Monzani; E. Moretti; A. Morselli; I. V. Moskalenko; S. Murgia; T. Nakamori; M. Naumann-Godo; P. L. Nolan; J. P. Norris; E. Nuss; T. Ohsugi; A. Okumura; N. Omodei; E. Orlando; J. F. Ormes; M. Ozaki; D. Paneque; J. H. Panetta; D. Parent; V. Pelassa; M. Pepe; M. Pesce-Rollins; V. Petrosian; M. Pinchera; F. Piron; T. A. Porter; S. Profumo; S. Rainò; R. Rando; E. Rapposelli; M. Razzano; A. Reimer; O. Reimer; T. Reposeur; J. Ripken; S. Ritz; L. S. Rochester; R. W. Romani; M. Roth; H. F.W. Sadrozinski; N. Saggini; D. Sanchez; A. Sander; C. Sgrò; E. J. Siskind; P. D. Smith; G. Spandre; P. Spinelli; Stawarz; T. E. Stephens; M. S. Strickman; A. W. Strong; D. J. Suson; H. Tajima; H. Takahashi; T. Takahashi; T. Tanaka; J. B. Thayer; J. G. Thayer; D. J. Thompson; L. Tibaldo; O. Tibolla; D. F. Torres; G. Tosti; A. Tramacere; M. Turri; Y. Uchiyama; T. L. Usher; J. Vandenbroucke; V. Vasileiou; N. Vilchez; V. Vitale; A. P. Waite; E. Wallace; P. Wang; B. L. Winer; K. S. Wood; Z. Yang; T. Ylinen; M. Ziegler

doi:10.1103/PhysRevD.82.092004

Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV

M. Ackermann^*, M. Ajello, W. B. Atwood, L. Baldini, J. Ballet, G. Barbiellini, D. Bastieri, B. M. Baughman, K. Bechtol, F. Bellardi, R. Bellazzini, F. Belli, B. Berenji, R. D. Blandford, E. D. Bloom, J. R. Bogart, E. Bonamente, A. W. Borgland, T. J. Brandt, J. BregeonA. Brez, M. Brigida, P. Bruel, R. Buehler, T. H. Burnett, G. Busetto, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, P. Carlson, S. Carrigan, J. M. Casandjian, M. Ceccanti, C. Cecchi, Ö Çelik, E. Charles, A. Chekhtman, C. C. Cheung, J. Chiang, A. N. Cillis, S. Ciprini, R. Claus, J. Cohen-Tanugi, J. Conrad, R. Corbet, M. Deklotz, C. D. Dermer, A. De Angelis, F. De Palma, S. W. Digel, G. Di Bernardo, E. Do Couto E Silva, P. S. Drell, A. Drlica-Wagner, R. Dubois, D. Fabiani, C. Favuzzi, S. J. Fegan, P. Fortin, Y. Fukazawa, S. Funk, P. Fusco, D. Gaggero, F. Gargano, D. Gasparrini, N. Gehrels, S. Germani, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, D. Grasso, I. A. Grenier, M. H. Grondin, J. E. Grove, S. Guiriec, M. Gustafsson, D. Hadasch, A. K. Harding, M. Hayashida, E. Hays, D. Horan, R. E. Hughes, G. Jóhannesson, A. S. Johnson, R. P. Johnson, W. N. Johnson, T. Kamae, H. Katagiri, J. Kataoka, M. Kerr, J. Knödlseder, M. Kuss, J. Lande, L. Latronico, M. Lemoine-Goumard, M. Llena Garde, F. Longo, F. Loparco, B. Lott, M. N. Lovellette, P. Lubrano, A. Makeev, M. N. Mazziotta, J. E. McEnery, J. Mehault, P. F. Michelson, M. Minuti, W. Mitthumsiri, T. Mizuno, A. A. Moiseev, C. Monte, M. E. Monzani, E. Moretti, A. Morselli, I. V. Moskalenko, S. Murgia, T. Nakamori, M. Naumann-Godo, P. L. Nolan, J. P. Norris, E. Nuss, T. Ohsugi, A. Okumura, N. Omodei, E. Orlando, J. F. Ormes, M. Ozaki, D. Paneque, J. H. Panetta, D. Parent, V. Pelassa, M. Pepe, M. Pesce-Rollins, V. Petrosian, M. Pinchera, F. Piron, T. A. Porter, S. Profumo, S. Rainò, R. Rando, E. Rapposelli, M. Razzano, A. Reimer, O. Reimer, T. Reposeur, J. Ripken, S. Ritz, L. S. Rochester, R. W. Romani, M. Roth, H. F.W. Sadrozinski, N. Saggini, D. Sanchez, A. Sander, C. Sgrò, E. J. Siskind, P. D. Smith, G. Spandre, P. Spinelli, Stawarz, T. E. Stephens, M. S. Strickman, A. W. Strong, D. J. Suson, H. Tajima, H. Takahashi, T. Takahashi, T. Tanaka, J. B. Thayer, J. G. Thayer, D. J. Thompson, L. Tibaldo, O. Tibolla, D. F. Torres, G. Tosti, A. Tramacere, M. Turri, Y. Uchiyama, T. L. Usher, J. Vandenbroucke, V. Vasileiou, N. Vilchez, V. Vitale, A. P. Waite, E. Wallace, P. Wang, B. L. Winer, K. S. Wood, Z. Yang, T. Ylinen, M. Ziegler

^*Corresponding author for this work

School of Advanced Science and Engineering

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

369 Citations (Scopus)

Abstract

We present the results of our analysis of cosmic-ray electrons using about 8×106 electron candidates detected in the first 12 months on-orbit by the Fermi Large Area Telescope. This work extends our previously published cosmic-ray electron spectrum down to 7 GeV, giving a spectral range of approximately 2.5 decades up to 1 TeV. We describe in detail the analysis and its validation using beam-test and on-orbit data. In addition, we describe the spectrum measured via a subset of events selected for the best energy resolution as a cross-check on the measurement using the full event sample. Our electron spectrum can be described with a power law E-3.08±0.05 with no prominent spectral features within systematic uncertainties. Within the limits of our uncertainties, we can accommodate a slight spectral hardening at around 100 GeV and a slight softening above 500 GeV.

Original language	English
Article number	092004
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	82
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevD.82.092004
Publication status	Published - 2010 Nov 18

ASJC Scopus subject areas

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

Access to Document

10.1103/PhysRevD.82.092004

Cite this

Ackermann, M., Ajello, M., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Baughman, B. M., Bechtol, K., Bellardi, F., Bellazzini, R., Belli, F., Berenji, B., Blandford, R. D., Bloom, E. D., Bogart, J. R., Bonamente, E., Borgland, A. W., Brandt, T. J., ... Ziegler, M. (2010). Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV. Physical Review D - Particles, Fields, Gravitation and Cosmology, 82(9), [092004]. https://doi.org/10.1103/PhysRevD.82.092004

Ackermann, M, Ajello, M, Atwood, WB, Baldini, L, Ballet, J, Barbiellini, G, Bastieri, D, Baughman, BM, Bechtol, K, Bellardi, F, Bellazzini, R, Belli, F, Berenji, B, Blandford, RD, Bloom, ED, Bogart, JR, Bonamente, E, Borgland, AW, Brandt, TJ, Bregeon, J, Brez, A, Brigida, M, Bruel, P, Buehler, R, Burnett, TH, Busetto, G, Buson, S, Caliandro, GA, Cameron, RA, Caraveo, PA, Carlson, P, Carrigan, S, Casandjian, JM, Ceccanti, M, Cecchi, C, Çelik, Ö, Charles, E, Chekhtman, A, Cheung, CC, Chiang, J, Cillis, AN, Ciprini, S, Claus, R, Cohen-Tanugi, J, Conrad, J, Corbet, R, Deklotz, M, Dermer, CD, De Angelis, A, De Palma, F, Digel, SW, Di Bernardo, G, Do Couto E Silva, E, Drell, PS, Drlica-Wagner, A, Dubois, R, Fabiani, D, Favuzzi, C, Fegan, SJ, Fortin, P, Fukazawa, Y, Funk, S, Fusco, P, Gaggero, D, Gargano, F, Gasparrini, D, Gehrels, N, Germani, S, Giglietto, N, Giommi, P, Giordano, F, Giroletti, M, Glanzman, T, Godfrey, G, Grasso, D, Grenier, IA, Grondin, MH, Grove, JE, Guiriec, S, Gustafsson, M, Hadasch, D, Harding, AK, Hayashida, M, Hays, E, Horan, D, Hughes, RE, Jóhannesson, G, Johnson, AS, Johnson, RP, Johnson, WN, Kamae, T, Katagiri, H, Kataoka, J, Kerr, M, Knödlseder, J, Kuss, M, Lande, J, Latronico, L, Lemoine-Goumard, M, Llena Garde, M, Longo, F, Loparco, F, Lott, B, Lovellette, MN, Lubrano, P, Makeev, A, Mazziotta, MN, McEnery, JE, Mehault, J, Michelson, PF, Minuti, M, Mitthumsiri, W, Mizuno, T, Moiseev, AA, Monte, C, Monzani, ME, Moretti, E, Morselli, A, Moskalenko, IV, Murgia, S, Nakamori, T, Naumann-Godo, M, Nolan, PL, Norris, JP, Nuss, E, Ohsugi, T, Okumura, A, Omodei, N, Orlando, E, Ormes, JF, Ozaki, M, Paneque, D, Panetta, JH, Parent, D, Pelassa, V, Pepe, M, Pesce-Rollins, M, Petrosian, V, Pinchera, M, Piron, F, Porter, TA, Profumo, S, Rainò, S, Rando, R, Rapposelli, E, Razzano, M, Reimer, A, Reimer, O, Reposeur, T, Ripken, J, Ritz, S, Rochester, LS, Romani, RW, Roth, M, Sadrozinski, HFW, Saggini, N, Sanchez, D, Sander, A, Sgrò, C, Siskind, EJ, Smith, PD, Spandre, G, Spinelli, P, Stawarz, Stephens, TE, Strickman, MS, Strong, AW, Suson, DJ, Tajima, H, Takahashi, H, Takahashi, T, Tanaka, T, Thayer, JB, Thayer, JG, Thompson, DJ, Tibaldo, L, Tibolla, O, Torres, DF, Tosti, G, Tramacere, A, Turri, M, Uchiyama, Y, Usher, TL, Vandenbroucke, J, Vasileiou, V, Vilchez, N, Vitale, V, Waite, AP, Wallace, E, Wang, P, Winer, BL, Wood, KS, Yang, Z, Ylinen, T & Ziegler, M 2010, 'Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 82, no. 9, 092004. https://doi.org/10.1103/PhysRevD.82.092004

@article{85dbb59d81d4474a9edb59c4272182e7,

title = "Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV",

abstract = "We present the results of our analysis of cosmic-ray electrons using about 8×106 electron candidates detected in the first 12 months on-orbit by the Fermi Large Area Telescope. This work extends our previously published cosmic-ray electron spectrum down to 7 GeV, giving a spectral range of approximately 2.5 decades up to 1 TeV. We describe in detail the analysis and its validation using beam-test and on-orbit data. In addition, we describe the spectrum measured via a subset of events selected for the best energy resolution as a cross-check on the measurement using the full event sample. Our electron spectrum can be described with a power law E-3.08±0.05 with no prominent spectral features within systematic uncertainties. Within the limits of our uncertainties, we can accommodate a slight spectral hardening at around 100 GeV and a slight softening above 500 GeV.",

author = "M. Ackermann and M. Ajello and Atwood, {W. B.} and L. Baldini and J. Ballet and G. Barbiellini and D. Bastieri and Baughman, {B. M.} and K. Bechtol and F. Bellardi and R. Bellazzini and F. Belli and B. Berenji and Blandford, {R. D.} and Bloom, {E. D.} and Bogart, {J. R.} and E. Bonamente and Borgland, {A. W.} and Brandt, {T. J.} and J. Bregeon and A. Brez and M. Brigida and P. Bruel and R. Buehler and Burnett, {T. H.} and G. Busetto and S. Buson and Caliandro, {G. A.} and Cameron, {R. A.} and Caraveo, {P. A.} and P. Carlson and S. Carrigan and Casandjian, {J. M.} and M. Ceccanti and C. Cecchi and {\"O} {\c C}elik and E. Charles and A. Chekhtman and Cheung, {C. C.} and J. Chiang and Cillis, {A. N.} and S. Ciprini and R. Claus and J. Cohen-Tanugi and J. Conrad and R. Corbet and M. Deklotz and Dermer, {C. D.} and {De Angelis}, A. and {De Palma}, F. and Digel, {S. W.} and {Di Bernardo}, G. and {Do Couto E Silva}, E. and Drell, {P. S.} and A. Drlica-Wagner and R. Dubois and D. Fabiani and C. Favuzzi and Fegan, {S. J.} and P. Fortin and Y. Fukazawa and S. Funk and P. Fusco and D. Gaggero and F. Gargano and D. Gasparrini and N. Gehrels and S. Germani and N. Giglietto and P. Giommi and F. Giordano and M. Giroletti and T. Glanzman and G. Godfrey and D. Grasso and Grenier, {I. A.} and Grondin, {M. H.} and Grove, {J. E.} and S. Guiriec and M. Gustafsson and D. Hadasch and Harding, {A. K.} and M. Hayashida and E. Hays and D. Horan and Hughes, {R. E.} and G. J{\'o}hannesson and Johnson, {A. S.} and Johnson, {R. P.} and Johnson, {W. N.} and T. Kamae and H. Katagiri and J. Kataoka and M. Kerr 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 B. Lott and Lovellette, {M. N.} and P. Lubrano and A. Makeev and Mazziotta, {M. N.} and McEnery, {J. E.} and J. Mehault and Michelson, {P. F.} and M. Minuti and W. Mitthumsiri and T. Mizuno and Moiseev, {A. A.} and C. Monte and Monzani, {M. E.} and E. Moretti and A. Morselli and Moskalenko, {I. V.} and S. Murgia and T. Nakamori and M. Naumann-Godo and Nolan, {P. L.} and Norris, {J. P.} and E. Nuss and T. Ohsugi and A. Okumura and N. Omodei and E. Orlando and Ormes, {J. F.} and M. Ozaki and D. Paneque and Panetta, {J. H.} and D. Parent and V. Pelassa and M. Pepe and M. Pesce-Rollins and V. Petrosian and M. Pinchera and F. Piron and Porter, {T. A.} and S. Profumo and S. Rain{\`o} and R. Rando and E. Rapposelli and M. Razzano and A. Reimer and O. Reimer and T. Reposeur and J. Ripken and S. Ritz and Rochester, {L. S.} and Romani, {R. W.} and M. Roth and Sadrozinski, {H. F.W.} and N. Saggini and D. Sanchez and A. Sander and C. Sgr{\`o} and Siskind, {E. J.} and Smith, {P. D.} and G. Spandre and P. Spinelli and Stawarz and Stephens, {T. E.} and Strickman, {M. S.} and Strong, {A. W.} and Suson, {D. J.} and H. Tajima and H. Takahashi and T. Takahashi and T. Tanaka and Thayer, {J. B.} and Thayer, {J. G.} and Thompson, {D. J.} and L. Tibaldo and O. Tibolla and Torres, {D. F.} and G. Tosti and A. Tramacere and M. Turri and Y. Uchiyama and Usher, {T. L.} and J. Vandenbroucke and V. Vasileiou and N. Vilchez and V. Vitale and Waite, {A. P.} and E. Wallace and P. Wang and Winer, {B. L.} and Wood, {K. S.} and Z. Yang and T. Ylinen and M. Ziegler",

year = "2010",

month = nov,

day = "18",

doi = "10.1103/PhysRevD.82.092004",

language = "English",

volume = "82",

journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",

issn = "1550-7998",

number = "9",

}

TY - JOUR

T1 - Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV

AU - Ackermann, M.

AU - Ajello, M.

AU - Atwood, W. B.

AU - Baldini, L.

AU - Ballet, J.

AU - Barbiellini, G.

AU - Bastieri, D.

AU - Baughman, B. M.

AU - Bechtol, K.

AU - Bellardi, F.

AU - Bellazzini, R.

AU - Belli, F.

AU - Berenji, B.

AU - Blandford, R. D.

AU - Bloom, E. D.

AU - Bogart, J. R.

AU - Bonamente, E.

AU - Borgland, A. W.

AU - Brandt, T. J.

AU - Bregeon, J.

AU - Brez, A.

AU - Brigida, M.

AU - Bruel, P.

AU - Buehler, R.

AU - Burnett, T. H.

AU - Busetto, G.

AU - Buson, S.

AU - Caliandro, G. A.

AU - Cameron, R. A.

AU - Caraveo, P. A.

AU - Carlson, P.

AU - Carrigan, S.

AU - Casandjian, J. M.

AU - Ceccanti, M.

AU - Cecchi, C.

AU - Çelik, Ö

AU - Charles, E.

AU - Chekhtman, A.

AU - Cheung, C. C.

AU - Chiang, J.

AU - Cillis, A. N.

AU - Ciprini, S.

AU - Claus, R.

AU - Cohen-Tanugi, J.

AU - Conrad, J.

AU - Corbet, R.

AU - Deklotz, M.

AU - Dermer, C. D.

AU - De Angelis, A.

AU - De Palma, F.

AU - Digel, S. W.

AU - Di Bernardo, G.

AU - Do Couto E Silva, E.

AU - Drell, P. S.

AU - Drlica-Wagner, A.

AU - Dubois, R.

AU - Fabiani, D.

AU - Favuzzi, C.

AU - Fegan, S. J.

AU - Fortin, P.

AU - Fukazawa, Y.

AU - Funk, S.

AU - Fusco, P.

AU - Gaggero, D.

AU - Gargano, F.

AU - Gasparrini, D.

AU - Gehrels, N.

AU - Germani, S.

AU - Giglietto, N.

AU - Giommi, P.

AU - Giordano, F.

AU - Giroletti, M.

AU - Glanzman, T.

AU - Godfrey, G.

AU - Grasso, D.

AU - Grenier, I. A.

AU - Grondin, M. H.

AU - Grove, J. E.

AU - Guiriec, S.

AU - Gustafsson, M.

AU - Hadasch, D.

AU - Harding, A. K.

AU - Hayashida, M.

AU - Hays, E.

AU - Horan, D.

AU - Hughes, R. E.

AU - Jóhannesson, G.

AU - Johnson, A. S.

AU - Johnson, R. P.

AU - Johnson, W. N.

AU - Kamae, T.

AU - Katagiri, H.

AU - Kataoka, J.

AU - Kerr, M.

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 - Lott, B.

AU - Lovellette, M. N.

AU - Lubrano, P.

AU - Makeev, A.

AU - Mazziotta, M. N.

AU - McEnery, J. E.

AU - Mehault, J.

AU - Michelson, P. F.

AU - Minuti, M.

AU - Mitthumsiri, W.

AU - Mizuno, T.

AU - Moiseev, A. A.

AU - Monte, C.

AU - Monzani, M. E.

AU - Moretti, E.

AU - Morselli, A.

AU - Moskalenko, I. V.

AU - Murgia, S.

AU - Nakamori, T.

AU - Naumann-Godo, M.

AU - Nolan, P. L.

AU - Norris, J. P.

AU - Nuss, E.

AU - Ohsugi, T.

AU - Okumura, A.

AU - Omodei, N.

AU - Orlando, E.

AU - Ormes, J. F.

AU - Ozaki, M.

AU - Paneque, D.

AU - Panetta, J. H.

AU - Parent, D.

AU - Pelassa, V.

AU - Pepe, M.

AU - Pesce-Rollins, M.

AU - Petrosian, V.

AU - Pinchera, M.

AU - Piron, F.

AU - Porter, T. A.

AU - Profumo, S.

AU - Rainò, S.

AU - Rando, R.

AU - Rapposelli, E.

AU - Razzano, M.

AU - Reimer, A.

AU - Reimer, O.

AU - Reposeur, T.

AU - Ripken, J.

AU - Ritz, S.

AU - Rochester, L. S.

AU - Romani, R. W.

AU - Roth, M.

AU - Sadrozinski, H. F.W.

AU - Saggini, N.

AU - Sanchez, D.

AU - Sander, A.

AU - Sgrò, C.

AU - Siskind, E. J.

AU - Smith, P. D.

AU - Spandre, G.

AU - Spinelli, P.

AU - Stawarz,

AU - Stephens, T. E.

AU - Strickman, M. S.

AU - Strong, A. W.

AU - Suson, D. J.

AU - Tajima, H.

AU - Takahashi, H.

AU - Takahashi, T.

AU - Tanaka, T.

AU - Thayer, J. B.

AU - Thayer, J. G.

AU - Thompson, D. J.

AU - Tibaldo, L.

AU - Tibolla, O.

AU - Torres, D. F.

AU - Tosti, G.

AU - Tramacere, A.

AU - Turri, M.

AU - Uchiyama, Y.

AU - Usher, T. L.

AU - Vandenbroucke, J.

AU - Vasileiou, V.

AU - Vilchez, N.

AU - Vitale, V.

AU - Waite, A. P.

AU - Wallace, E.

AU - Wang, P.

AU - Winer, B. L.

AU - Wood, K. S.

AU - Yang, Z.

AU - Ylinen, T.

AU - Ziegler, M.

PY - 2010/11/18

Y1 - 2010/11/18

N2 - We present the results of our analysis of cosmic-ray electrons using about 8×106 electron candidates detected in the first 12 months on-orbit by the Fermi Large Area Telescope. This work extends our previously published cosmic-ray electron spectrum down to 7 GeV, giving a spectral range of approximately 2.5 decades up to 1 TeV. We describe in detail the analysis and its validation using beam-test and on-orbit data. In addition, we describe the spectrum measured via a subset of events selected for the best energy resolution as a cross-check on the measurement using the full event sample. Our electron spectrum can be described with a power law E-3.08±0.05 with no prominent spectral features within systematic uncertainties. Within the limits of our uncertainties, we can accommodate a slight spectral hardening at around 100 GeV and a slight softening above 500 GeV.

AB - We present the results of our analysis of cosmic-ray electrons using about 8×106 electron candidates detected in the first 12 months on-orbit by the Fermi Large Area Telescope. This work extends our previously published cosmic-ray electron spectrum down to 7 GeV, giving a spectral range of approximately 2.5 decades up to 1 TeV. We describe in detail the analysis and its validation using beam-test and on-orbit data. In addition, we describe the spectrum measured via a subset of events selected for the best energy resolution as a cross-check on the measurement using the full event sample. Our electron spectrum can be described with a power law E-3.08±0.05 with no prominent spectral features within systematic uncertainties. Within the limits of our uncertainties, we can accommodate a slight spectral hardening at around 100 GeV and a slight softening above 500 GeV.

UR - http://www.scopus.com/inward/record.url?scp=78651335208&partnerID=8YFLogxK

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U2 - 10.1103/PhysRevD.82.092004

DO - 10.1103/PhysRevD.82.092004

M3 - Article

AN - SCOPUS:78651335208

SN - 1550-7998

VL - 82

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

IS - 9

M1 - 092004

ER -

Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV

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