In-flight measurement of the absolute energy scale of the Fermi Large Area Telescope

被引：35

作者：

Ackermann, M. ^{[2
]}

Ajello, M. ^{[2
]}

Allafort, A. ^{[2
]}

Atwood, W. B. ^{[3
,4
]}

Axelsson, M. ^{[5
,6
,7
]}

Baldini, L. ^{[1
]}

Barbiellini, G. ^{[8
,9
]}

Bastieri, D. ^{[10
,11
]}

Bechtol, K. ^{[2
]}

Bellazzini, R. ^{[1
]}

Berenji, B. ^{[2
]}

Bloom, E. D. ^{[2
]}

Bonamente, E. ^{[12
,13
]}

Borgland, A. W. ^{[2
]}

Bouvier, A. ^{[3
,4
]}

Bregeon, J. ^{[1
]}

Brez, A. ^{[1
]}

Brigida, M. ^{[14
,15
,16
]}

Bruel, P. ^{[17
]}

Buehler, R. ^{[2
]}

Buson, S. ^{[10
,11
]}

Caliandro, G. A. ^{[18
]}

Cameron, R. A. ^{[2
]}

Caraveo, P. A. ^{[19
]}

Casandjian, J. M. ^{[20
]}

Cecchi, C. ^{[12
,13
]}

Charles, E. ^{[2
]}

Chekhtman, A. ^{[21
]}

Chiang, J. ^{[2
]}

Ciprini, S. ^{[13
,22
]}

Claus, R. ^{[2
]}

Cohen-Tanugi, J. ^{[23
]}

Cutini, S. ^{[24
]}

de Palma, F. ^{[14
,15
,16
]}

Dermer, C. D. ^{[25
]}

Digel, S. W. ^{[2
]}

do Couto e Silva, E. ^{[2
]}

Drell, P. S. ^{[2
]}

Drlica-Wagner, A. ^{[2
]}

Dubois, R. ^{[2
]}

Enoto, T. ^{[2
]}

Falletti, L. ^{[23
]}

Favuzzi, C. ^{[14
,15
,16
]}

Fegan, S. J. ^{[17
]}

Focke, W. B. ^{[2
]}

Fortin, P. ^{[17
]}

Fukazawa, Y. ^{[26
]}

Funk, S. ^{[2
]}

Fusco, P. ^{[14
,15
,16
]}

Gargano, F. ^{[16
]}

机构：

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

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

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

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

[5] Stockholm Univ, Dept Astron, SE-10691 Stockholm, Sweden

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

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

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

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

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

[11] Univ Padua, Dipartimento Fis G Galilei, I-35131 Padua, Italy

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

[13] Univ Perugia, Dipartimento Fis, I-06123 Perugia, Italy

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

[15] Politecn Bari, I-70126 Bari, Italy

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

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

[18] CSIC, IEEE, Inst Ciencies Espai, Barcelona 08193, Spain

[19] INAF Ist Astrofis Spaziale & Fis Cosm, I-20133 Milan, Italy

[20] Univ Paris Diderot, Serv Astrophys, CEA Saclay, CEA,IRFU,CNRS,Lab AIM, F-91191 Gif Sur Yvette, France

[21] Artep Inc, Ellicott City, MD 21042 USA

[22] ASI Sci Data Ctr, I-00044 Rome, Italy

[23] Univ Montpellier 2, CNRS, IN2P3, Lab Univers & Particules Montpellier, Montpellier, France

[24] Agenzia Spaziale Italiana ASI Sci Data Ctr, I-00044 Rome, Italy

[25] USN, Div Space Sci, Res Lab, Washington, DC 20375 USA

[26] Hiroshima Univ, Dept Phys Sci, Higashihiroshima, Hiroshima 7398526, Japan

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

[28] Univ Alabama, CSPAR, Huntsville, AL 35899 USA

[29] Ohio State Univ, Dept Phys, Ctr Cosmol & Astroparticle Phys, Columbus, OH 43210 USA

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

[31] Natl Acad Sci, Natl Res Council Res Associate, Washington, DC 20001 USA

[32] Ibaraki Univ, Coll Sci, Mito, Ibaraki 3108512, Japan

[33] Waseda Univ, Res Inst Sci & Engn, Shinjuku Ku, Tokyo 1698555, Japan

[34] CNRS, IRAP, F-31028 Toulouse 4, France

[35] Univ Toulouse, UPS OMP, IRAP, Toulouse, France

[36] Kyoto Univ, Yukawa Inst Theoret Phys, Sakyo Ku, Kyoto 6068502, Japan

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

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

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

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

[41] Univ Denver, Dept Phys & Astron, Denver, CO 80208 USA

[42] Hiroshima Univ, Hiroshima Astrophys Sci Ctr, Higashihiroshima, Hiroshima 7398526, Japan

[43] JAXA, Inst Space & Astronaut Sci, Chuo Ku, Sagamihara, Kanagawa 2525210, Japan

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

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

[46] George Mason Univ, Coll Sci, Ctr Earth Observing & Space Res, Fairfax, VA 22030 USA

[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] Univ Bordeaux 1, CNRS, IN2P3, Ctr Etud Nucl Bordeaux Gradignan, F-33175 Gradignan, France

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

来源：

ASTROPARTICLE PHYSICS | 2012年 / 35卷 / 06期

基金：

美国国家航空航天局; 瑞典研究理事会;

关键词：

Cosmic-rays; Geomagnetic cutoff; Absolute energy scale; Fermi Large Area Telescope; MISSION;

D O I：

10.1016/j.astropartphys.2011.10.007

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope is a pair-conversion telescope designed to survey the gamma-ray sky from 20 MeV to several hundreds of GeV. In this energy band there are no astronomical sources with sufficiently well known and sharp spectral features to allow an absolute calibration of the LAT energy scale. However, the geomagnetic cutoff in the cosmic ray electron-plus-positron (CRE) spectrum in low Earth orbit does provide such a spectral feature. The energy and spectral shape of this cutoff can be calculated with the aid of a numerical code tracing charged particles in the Earth's magnetic field. By comparing the cutoff value with that measured by the LAT in different geomagnetic positions, we have obtained several calibration points between similar to 6 and similar to 13 GeV with an estimated uncertainty of similar to 2%. An energy calibration with such high accuracy reduces the systematic uncertainty in LAT measurements of, for example, the spectral cutoff in the emission from gamma ray pulsars. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：346 / 353

页数：8

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