Ackermann M, Ajello M, Allafort A, Atwood WB, Axelsson M, Baldini L, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Berenji B, Bloom ED, Bonamente E, Borgland AW, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Buson S, Caliandro GA, Cameron RA, Caraveo PA, Casandjian JM, Cecchi C, Charles E, Chekhtman A, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Cutini S, De Palma F, Dermer CD, Digel SW, Do Couto E Silva E, Drell PS, Drlica-Wagner A, Dubois R, Enoto T, Falletti L, Favuzzi C, Fegan SJ, Focke WB, Fortin P, Fukazawa Y, Funk S, Fusco P, Gargano F, Gehrels N, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier IA, Grove JE, Guiriec S, Hadasch D, Hayashida M, Hays E, Hughes RE, Johannesson G, Johnson AS, Johnson TJ, Kamae T, Katagiri H, Kataoka J, Knoedlseder J, Kuss MW, Lande J, Latronico L, Lee SH, Longo F, Loparco F, Lovellette MN, Lubrano P, Madejski GM, Mazziotta MN, Mcenery JE, Michelson PF, Mizuno T, Moiseev AA, Monte C, Monzani ME, 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, Pesce-Rollins M, Pierbattista M, Piron F, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Reposeur T, Ritz S, Rochester LS, Sgro C, Siskind EJ, Smith PD, Spandre G, Spinelli P, Suson DJ, Takahashi HH, Tanaka T, Thayer JG, Thayer JB, Thompson DJ, Tibaldo L, Tosti G, Troja E, Usher TL, Vandenbroucke J, Vasileiou V, Vianello G, Vilchez N, Vitale V, Waite AP, Wang P, Winer BL, Wood KS, Yang Z, Zimmer S (2012)
Publication Type: Journal article
Publication year: 2012
Book Volume: 35
Pages Range: 346-353
Journal Issue: 6
DOI: 10.1016/j.astropartphys.2011.10.007
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.
APA:
Ackermann, M., Ajello, M., Allafort, A., Atwood, W.B., Axelsson, M., Baldini, L.,... Zimmer, S. (2012). In-flight measurement of the absolute energy scale of the Fermi Large Area Telescope. Astroparticle Physics, 35(6), 346-353. https://doi.org/10.1016/j.astropartphys.2011.10.007
MLA:
Ackermann, Markus, et al. "In-flight measurement of the absolute energy scale of the Fermi Large Area Telescope." Astroparticle Physics 35.6 (2012): 346-353.
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