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The Astrophysical Journal 738 (2011) 42
DETECTION OF THE PULSAR WIND NEBULA HESS J1825−137 WITH THE FERMI LARGE AREA TELESCOPE
M.-H. Grondin, S. Funk, M. Lemoine-Goumard1, A. Van Etten, J. A. Hinton, F. Camilo, I. Cognard2, 3, C. M. Espinoza, P. C. C. Freire, J. E. Grove, L. Guillemot, S. Johnston, M. Kramer, J. Lande, P. Michelson, A. Possenti, R. W. Romani, J. L. Skilton, G. Theureau2, 3, P. Weltevrede
(2011-09-01)

We announce the discovery of 1-100 GeV gamma-ray emission from the archetypal TeV pulsar wind nebula (PWN) HESS J1825−137 using 20 months of survey data from the Fermi-Large Area Telescope (LAT). The gamma-ray emission detected by the LAT is significantly spatially extended, with a best-fit rms extension of σ = 0. ◦ 56±0. ◦ 07 for an assumed Gaussian model. The 1-100 GeV LAT spectrum of this source is well described by a power law with a spectral index of 1.38 ± 0.12 ± 0.16 and an integral flux above 1 GeV of (6.50 ± 0.21 ± 3.90) ×10−9 cm−2 s−1. The first errors represent the statistical errors on the fit parameters, while the second ones are the systematic uncertainties. Detailed morphological and spectral analyses bring new constraints on the energetics and magnetic field of the PWN system. The spatial extent and hard spectrum of the GeV emission are consistent with the picture of an inverse Compton origin of the GeV-TeV emission in a cooling-limited nebula powered by the pulsar PSR J1826−1334
1:  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
2:  LPCE - Laboratoire de physique et chimie de l'environnement
3:  USN - Unité Scientifique de la Station de Nançay
GLAST
Physics/Astrophysics/High Energy Astrophysical Phenomena

Sciences of the Universe/Astrophysics/High Energy Astrophysical Phenomena
gamma rays: general - ISM: individual objects (G18.0-0.7 – HESS J1825−137) - pulsars: general - pulsars: individual (PSR B1823-13 – PSR J1826-1334)