FERMILARGE AREA TELESCOPE OBSERVATIONS OF THE VELA-X PULSAR WIND NEBULA
- 18 March 2010
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 713 (1), 146-153
- https://doi.org/10.1088/0004-637x/713/1/146
Abstract
We report on gamma-ray observations in the off-pulse window of the Vela pulsar PSR B0833–45 using 11 months of survey data from the Fermi Large Area Telescope (LAT). This pulsar is located in the 8° diameter Vela supernova remnant, which contains several regions of non-thermal emission detected in the radio, X-ray, and gamma-ray bands. The gamma-ray emission detected by the LAT lies within one of these regions, the 2° × 3° area south of the pulsar known as Vela-X. The LAT flux is significantly spatially extended with a best-fit radius of 088 ± 012 for an assumed radially symmetric uniform disk. The 200 MeV to 20 GeV LAT spectrum of this source is well described by a power law with a spectral index of 2.41 ± 0.09 ± 0.15 and integral flux above 100 MeV of (4.73 ± 0.63 ± 1.32) × 10–7 cm–2 s–1. The first errors represent the statistical error on the fit parameters, while the second ones are the systematic uncertainties. Detailed morphological and spectral analyses give strong constraints on the energetics and magnetic field of the pulsar wind nebula system and favor a scenario with two distinct electron populations.Keywords
This publication has 30 references indexed in Scilit:
- THE VELA PULSAR: RESULTS FROM THE FIRST YEAR OF FERMI LAT OBSERVATIONSThe Astrophysical Journal, 2010
- FERMI/LARGE AREA TELESCOPE BRIGHT GAMMA-RAY SOURCE LISTThe Astrophysical Journal Supplement Series, 2009
- THE LARGE AREA TELESCOPE ON THEFERMI GAMMA-RAY SPACE TELESCOPEMISSIONThe Astrophysical Journal, 2009
- FERMILARGE AREA TELESCOPE OBSERVATIONS OF THE VELA PULSARThe Astrophysical Journal, 2009
- Probing the Radio to X-Ray Connection of the Vela X Pulsar Wind Nebula with Fermi LAT and H.E.S.S.The Astrophysical Journal, 2008
- First detection of a VHE gamma-ray spectral maximum from a cosmic source: HESS discovery of the Vela X nebulaAstronomy & Astrophysics, 2006
- Pulsar Wind Nebulae in Evolved Supernova RemnantsThe Astrophysical Journal, 2001
- The radio spectral index of the Vela supernova remnantAstronomy & Astrophysics, 2001
- OSSE Detection of Gamma Rays from the VELA Synchrotron NebulaThe Astrophysical Journal, 1996
- Discovery of explosion fragments outside the Vela supernova remnant shock-wave boundaryNature, 1995