Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
In-flight measurement of the absolute energy scale of the Fermi Large Area Telescope
Vise andre og tillknytning
2012 (engelsk)Inngår i: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 35, nr 6, s. 346-353Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

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.

sted, utgiver, år, opplag, sider
2012. Vol. 35, nr 6, s. 346-353
Emneord [en]
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
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-85985DOI: 10.1016/j.astropartphys.2011.10.007ISI: 000300760800007Scopus ID: 2-s2.0-81455161628OAI: oai:DiVA.org:kth-85985DiVA, id: diva2:500322
Forskningsfinansiär
Swedish Research Council, VR623-2009-691
Merknad

QC 20120402

Tilgjengelig fra: 2012-02-13 Laget: 2012-02-13 Sist oppdatert: 2017-12-07bibliografisk kontrollert

Open Access i DiVA

Fulltekst mangler i DiVA

Andre lenker

Forlagets fulltekstScopus

Personposter BETA

Axelsson, M.

Søk i DiVA

Av forfatter/redaktør
Axelsson, M.
Av organisasjonen
I samme tidsskrift
Astroparticle physics

Søk utenfor DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 74 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf