DETECTION OF THE PULSAR WIND NEBULA HESS J1825-137 WITH THE FERMI LARGE AREA TELESCOPE

Grondin, M -H; Lemoine-Goumard, M; Funk, S; Van Etten, A; Lande, J; Michelson, P; Romani, R W; Hinton, J A; Camilo, F; Cognard, I; Theureau, G; Espinoza, C M; Kramer, M; Weltevrede, P; Freire, P C. C.; Guillemot, L; Grove, J E; Johnston, S; Possenti, A

doi:10.1088/0004-637X/738/1/42

Title: DETECTION OF THE PULSAR WIND NEBULA HESS J1825-137 WITH THE FERMI LARGE AREA TELESCOPE

Journal Article · Thu Sep 01 00:00:00 EDT 2011 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/738/1/42· OSTI ID:21582971

Grondin, M -H; Lemoine-Goumard, M ^[1]; Funk, S; Van Etten, A; Lande, J; Michelson, P; Romani, R W ^[2]; Hinton, J A ^[3]; Camilo, F ^[4]; Cognard, I; Theureau, G ^[5]; Espinoza, C M; Kramer, M; Weltevrede, P ^[6]; Freire, P C. C.; Guillemot, L ^[7]; Grove, J E ^[8]; Johnston, S ^[9]; Possenti, A ^[10]

Centre d'Etudes Nucleaires de Bordeaux Gradignan, Universite Bordeaux 1, CNRS/IN2P3, 33175 Gradignan (France)
W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305 (United States)
Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH (United Kingdom)
Columbia Astrophysics Laboratory, Columbia University, New York, NY 10027 (United States)
Laboratoire de Physique et Chimie de l'Environnement, LPCE UMR 6115 CNRS, F-45071 Orleans Cedex 02, and Station de radioastronomie de Nancay, Observatoire de Paris, CNRS/INSU, F-18330 Nancay (France)
Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, M13 9PL (United Kingdom)
Max-Planck-Institut fuer Radioastronomie, Auf dem Huegel 69, 53121 Bonn (Germany)
Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States)
Australia Telescope National Facility, CSIRO, Epping, NSW 1710 (Australia)
INAF-Cagliari Astronomical Observatory, I-09012 Capoterra (Italy)

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 {sigma} = 0.{sup 0}56 {+-} 0.{sup 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) x 10{sup -9} cm{sup -2} s{sup -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.

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OSTI ID:: 21582971

Journal Information:: Astrophysical Journal, Vol. 738, Issue 1; Other Information: DOI: 10.1088/0004-637X/738/1/42; ISSN 0004-637X

Country of Publication:: United States

Language:: English

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Title: DETECTION OF THE PULSAR WIND NEBULA HESS J1825-137 WITH THE FERMI LARGE AREA TELESCOPE

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