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- Ackermann, M. (author)
In-flight measurement of the absolute energy scale of the Fermi Large Area Telescope
- Article/chapterEnglish2012
Publisher, publication year, extent ...
- Elsevier BV,2012
- printrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:kth-85985
- https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-85985URI
- https://doi.org/10.1016/j.astropartphys.2011.10.007DOI
- https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-76771URI
Supplementary language notes
- Language:English
- Summary in:English
Part of subdatabase
- SwePubSwePub
Classification
Notes
- QC 20120402
- 141
- 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 ∌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.
Subject headings and genre
- NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
- NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
- NATURVETENSKAP Fysik hsv//swe
- NATURAL SCIENCES Physical Sciences hsv//eng
- Absolute energy scale
- Cosmic-rays
- Fermi Large Area Telescope
- Geomagnetic cutoff
- Absolute calibration
- Astronomical sources
- Calibration points
- Cut-off value
- Earth's magnetic field
- Energy band
- Energy calibration
- Energy scale
- Large area telescopes
- Low earth orbits
- Numerical code
- Pair-conversion
- Spectral feature
- Spectral shapes
- Systematic uncertainties
- Calibration
- Geomagnetism
- Magnetic fields
- Optical telescopes
- Telescopes
- Uncertainty analysis
- Gamma rays
Added entries (persons, corporate bodies, meetings, titles ...)
- Ajello, M. (author)
- Allafort, A. (author)
- Atwood, W. B. (author)
- Axelsson, MagnusStockholms universitet,KTH,Partikel- och astropartikelfysik,Institutionen för astronomi(Swepub:su)aaxe (author)
- Baldini, L. (author)
- Barbiellini, G. (author)
- Bastieri, D. (author)
- Bechtol, K. (author)
- Bellazzini, R. (author)
- Berenji, B. (author)
- Bloom, E. D. (author)
- Bonamente, E. (author)
- Borgland, A. W. (author)
- Bouvier, A. (author)
- Bregeon, J. (author)
- Brez, A. (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)
- Chiang, J. (author)
- Ciprini, S. (author)
- Claus, R. (author)
- Cohen-Tanugi, J. (author)
- Cutini, S. (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)
- Dubois, R. (author)
- Enoto, T. (author)
- Falletti, L. (author)
- Favuzzi, C. (author)
- Fegan, S. J. (author)
- Focke, W. B. (author)
- Fortin, P. (author)
- Fukazawa, Y. (author)
- Funk, S. (author)
- Fusco, P. (author)
- Gargano, F. (author)
- Gehrels, N. (author)
- Germani, S. (author)
- Giglietto, N. (author)
- Giordano, F. (author)
- Giroletti, M. (author)
- Glanzman, T. (author)
- Godfrey, G.Stockholms universitet,Institutionen för astronomi (author)
- Grenier, I. A. (author)
- Grove, J. E. (author)
- Guiriec, S. (author)
- Hadasch, D. (author)
- Hayashida, M. (author)
- Hays, E. (author)
- Hughes, R. E. (author)
- Jóhannesson, G. (author)
- Johnson, A. S. (author)
- Johnson, T. J. (author)
- Kamae, T. (author)
- Katagiri, H. (author)
- Kataoka, J. (author)
- Knödlseder, J. (author)
- Kuss, M. (author)
- Lande, J. (author)
- Latronico, L. (author)
- Lee, S. -H (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)
- 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)
- Naumann-Godo, M. (author)
- Nolan, P. L. (author)
- Norris, J. P. (author)
- Nuss, E. (author)
- Ohsugi, T. (author)
- Okumura, A. (author)
- Omodei, N. (author)
- Orlando, E. (author)
- Ormes, J. F. (author)
- Ozaki, M. (author)
- Paneque, D. (author)
- Panetta, J. H. (author)
- Parent, D. (author)
- Pesce-Rollins, M. (author)
- Pierbattista, M. (author)
- Piron, F. (author)
- Rain, S. (author)
- Rando, R. (author)
- Razzano, M. (author)
- Reimer, A. (author)
- Reimer, O. (author)
- Reposeur, T. (author)
- Ritz, S. (author)
- Rochester, L. S. (author)
- Sgr, C. (author)
- Siskind, E. J. (author)
- Smith, P. D. (author)
- Spandre, G. (author)
- Spinelli, P. (author)
- Suson, D. J. (author)
- Takahashi, H. (author)
- Tanaka, T. (author)
- Thayer, J. G. (author)
- Thayer, J. B. (author)
- Thompson, D. J. (author)
- Tibaldo, L. (author)
- Tosti, G. (author)
- Troja, E. (author)
- Usher, T. L. (author)
- Vandenbroucke, J. (author)
- Vasileiou, V. (author)
- Vianello, G. (author)
- Vilchez, N. (author)
- Vitale, V. (author)
- Waite, A. P. (author)
- Wang, P. (author)
- Winer, B. L. (author)
- Wood, K. S. (author)
- Yang, Z. (author)
- Zimmer, StephanStockholms universitet,Fysikum(Swepub:su)stzi0820 (author)
- Knoedlseder, J. (author)
- KTHPartikel- och astropartikelfysik (creator_code:org_t)
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- In:Astroparticle physics: Elsevier BV35:6, s. 346-3530927-65051873-2852
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- Sgr, C.
- Siskind, E. J.
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- Spinelli, P.
- Suson, D. J.
- Takahashi, H.
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