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

Markus Ackermann; Marco Ajello; A. Allafort; W.B. Atwood; Magnus Axelsson; Luca Baldini; Guido Barbiellini; D. Bastieri; K. Bechtol; R. Bellazzini; B. Berenji; E.D. Bloom; E. Bonamente; A.W. Borgland; A. Bouvier; J. Bregeon; A. Brez; M. Brigidam; Pascal Bruel; R. Buehler; S. Buson; G.A. Caliandro; R.A. Cameron; P. A. Caraveo; J.M. Casandjian; C. Cecchi; E. Charles; A. Chekhtman; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; S. Cutini; F. de Palmam; C.D. Dermer; S.W. Digel; E. Silva; P.S. Drell; A. Drlica-Wagner; R. Dubois; T. Enoto; L. Falletti; C. Favuzzim; S.J. Fegan; W.B. Focke; P. Fortin; Y. Fukazawa; S. Funk; P. Fuscom; F. Gargano; N. Gehrels; S. Germani; N. Giglietto; F. Giordano; M. Giroletti; T. Glanzman; G. Godfrey; I.A. Grenier; J.E. Grove; S. Guiriec; D. Hadasch; M. Hayashida; E. Hays; R.E. Hughes; G. Jóhannesson; A.S. Johnson; T.J. Johnson; T. Kamae; H. Katagiri; J. Kataoka; Jürgen Knödlseder; M. Kuss; J. Lande; L. Latronico; S.-H. Lee; F. Longo; F. Loparco; M.N. Lovellette; P. Lubrano; G.M. Madejski; M.N. Mazziotta; J.E. Mcenery; P.F. Michelson; T. Mizuno; A.A. Moiseev; C. Monte; M.E. Monzani; 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; M. Pesce-Rollins; M. Pierbattista; F. Piron; S. Rainò; R. Rando; M. Razzano; A. Reimer; O. Reimer; T. Reposeur; S. Ritz; L.S. Rochester; C. Sgrò; E.J. Siskind; P.D. Smith; G. Spandre; P. Spinelli; D.J. Suson; H. Takahashi; T. Tanaka; J.G. Thayer; J.B. Thayer; D.J. Thompson; L. Tibaldo; G. Tosti; E. Troja; T.L. Usher; J. Vandenbroucke; V. Vasileiou; G. Vianello; N. Vilchez; V. Vitale; A.P. Waite; P. Wang; B.L. Winer; K.S. Wood; Z. Yang; S. Zimmer

doi:10.1016/j.astropartphys.2011.10.007

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

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

Markus Ackermann, Marco Ajello, A. Allafort, W.B. Atwood, Magnus Axelsson, Luca Baldini, Guido Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, …

Astroparticle Physics, Vol.5, pp.346-353

2012

DOI: https://doi.org/10.1016/j.astropartphys.2011.10.007

Abstract

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

The LargeAreaTelescope (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 energyscale. 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 ∼6 and ∼13 GeV with an estimated uncertainty of ∼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.

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Title: In-flight measurement of the absolute energy scale of the Fermi Large Area Telescope
Creators - without role: Markus Ackermann - Kavli Institute for Particle Astrophysics and Cosmology
Marco Ajello - Kavli Institute for Particle Astrophysics and Cosmology
A. Allafort - Kavli Institute for Particle Astrophysics and Cosmology
W.B. Atwood - University of California, Santa Cruz
Magnus Axelsson - Fraunhofer Chalmers Research Centre for Industrial Mathematics
Luca Baldini - Istituto Nazionale di Fisica Nucleare
Guido Barbiellini - University of Trieste
D. Bastieri - University of Padua
K. Bechtol - Kavli Institute for Particle Astrophysics and Cosmology
R. Bellazzini - Istituto Nazionale di Fisica Nucleare
B. Berenji - Stanford University
E.D. Bloom - Kavli Institute for Particle Astrophysics and Cosmology
E. Bonamente - University of Perugia
A.W. Borgland - Stanford University
A. Bouvier - University of California, Santa Cruz
J. Bregeon - Istituto Nazionale di Fisica Nucleare
A. Brez - Istituto Nazionale di Fisica Nucleare
M. Brigidam
Pascal Bruel - Laboratoire d'Informatique de l'École Polytechnique
R. Buehler - Kavli Institute for Particle Astrophysics and Cosmology
S. Buson - University of Padua
G.A. Caliandro - Institute of Space Sciences
R.A. Cameron - Stanford University
P. A. Caraveo - Institute for Space Astrophysics and Planetology
J.M. Casandjian - Université Paris Cité
C. Cecchi - United States Naval Research Laboratory
E. Charles - Kavli Institute for Particle Astrophysics and Cosmology
A. Chekhtman - Hiroshima University
J. Chiang - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
S. Ciprini - University of Perugia
R. Claus - Kavli Institute for Particle Astrophysics and Cosmology
J. Cohen-Tanugi - Université de Montpellier
S. Cutini - University of Padua
F. de Palmam
C.D. Dermer - United States Naval Research Laboratory
S.W. Digel - Kavli Institute for Particle Astrophysics and Cosmology
E. Silva
P.S. Drell - Kavli Institute for Particle Astrophysics and Cosmology
A. Drlica-Wagner - Centre National de la Recherche Scientifique
R. Dubois - Kavli Institute for Particle Astrophysics and Cosmology
T. Enoto - University of Perugia
L. Falletti - Université de Montpellier
C. Favuzzim
S.J. Fegan - Laboratoire d'Informatique de l'École Polytechnique
W.B. Focke - Stanford University
P. Fortin - Laboratoire d'Informatique de l'École Polytechnique
Y. Fukazawa - Hiroshima University
S. Funk - University of Padua
P. Fuscom
F. Gargano - Istituto Nazionale di Fisica Nucleare
N. Gehrels - Goddard Space Flight Center
S. Germani - University of Perugia
N. Giglietto - Polytechnic University of Bari
F. Giordano - Polytechnic University of Bari
M. Giroletti - Institute for Space Astrophysics and Planetology
T. Glanzman - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
G. Godfrey - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
I.A. Grenier - Université Paris Cité
J.E. Grove - United States Naval Research Laboratory
S. Guiriec - University of Alabama in Huntsville
D. Hadasch - Institute of Space Sciences
M. Hayashida - Polytechnic University of Bari
E. Hays - Goddard Space Flight Center
R.E. Hughes - The Ohio State University
G. Jóhannesson - University of Iceland
A.S. Johnson - Istituto Nazionale di Fisica Nucleare, Sezione di Padova
T.J. Johnson - National Academies of Sciences, Engineering, and Medicine
T. Kamae - University of Perugia
H. Katagiri - Ibaraki University
J. Kataoka - Waseda University
Jürgen Knödlseder - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Kuss - Istituto Nazionale di Fisica Nucleare
J. Lande - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
L. Latronico - Istituto Nazionale di Fisica Nucleare
S.-H. Lee - Kyoto University
F. Longo - University of Trieste
F. Loparco - Polytechnic University of Bari
M.N. Lovellette - United States Naval Research Laboratory
P. Lubrano - University of Perugia
G.M. Madejski - National Academies of Sciences, Engineering, and Medicine
M.N. Mazziotta - Istituto Nazionale di Fisica Nucleare
J.E. Mcenery - University of Maryland, College Park
P.F. Michelson - Kavli Institute for Particle Astrophysics and Cosmology
T. Mizuno - Hiroshima University
A.A. Moiseev - University of Maryland, College Park
C. Monte - Polytechnic University of Bari
M.E. Monzani - University of Perugia
A. Morselli - Istituto Nazionale di Fisica Nucleare
I.V. Moskalenko - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
S. Murgia - University of Padua
T. Nakamori - Waseda University
M. Naumann-Godo - Délégation Paris 7
P.L. Nolan - Stanford University
J.P. Norris - University of Denver
E. Nuss - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
T. Ohsugi - Hiroshima University
A. Okumura - Stanford University
N. Omodei - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. Orlando - Max Planck Innovation
J.F. Ormes - University of Denver
M. Ozaki - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
D. Paneque - Max Planck Innovation
J.H. Panetta - Universität Innsbruck
D. Parent - George Mason University
M. Pesce-Rollins - Istituto Nazionale di Fisica Nucleare
M. Pierbattista - Université Paris Cité
F. Piron - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
S. Rainò - Instituto Politécnico Nacional
R. Rando - University of Padua
M. Razzano - Istituto Nazionale di Fisica Nucleare
A. Reimer - Stanford University
O. Reimer - Stanford University
T. Reposeur - Université de Bordeaux
S. Ritz - University of Padua
L.S. Rochester - AlbaNova
C. Sgrò - Istituto Nazionale di Fisica Nucleare
E.J. Siskind - Real Time Tomography
P.D. Smith - The Ohio State University
G. Spandre - Istituto Nazionale di Fisica Nucleare
P. Spinelli - Polytechnic University of Bari
D.J. Suson - Purdue University Northwest
H. Takahashi - Hiroshima University
T. Tanaka - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
J.G. Thayer - Kavli Institute for Particle Astrophysics and Cosmology
J.B. Thayer - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
D.J. Thompson - Goddard Space Flight Center
L. Tibaldo - University of Padua
G. Tosti - University of Perugia
E. Troja - Goddard Space Flight Center
T.L. Usher - Stanford University
J. Vandenbroucke - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
V. Vasileiou - Université de Montpellier, Laboratoire Univers et Particules de Montpellier - LUPM
G. Vianello - Stanford University
N. Vilchez - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
V. Vitale - University of Rome Tor Vergata
A.P. Waite - Kyoto University
P. Wang - École Polytechnique
B.L. Winer - The Ohio State University
K.S. Wood - United States Naval Research Laboratory
Z. Yang - Stockholm University
S. Zimmer - Stockholm University
Publication Details: Astroparticle Physics, Vol.5, pp.346-353
Identifiers: 9936398209311
Academic Unit: Laboratoire Univers et Particules de Montpellier - LUPM
Language: English
Resource Type: Journal article
Local Fields: in2p3-00684886