HESS J1640–465 AND HESS J1641–463 [electronic resource] : TWO INTRIGUING TeV SOURCES IN LIGHT OF NEW <i>FERMI</i> -LAT OBSERVATIONS
- Washington, D.C. : United States. Dept. of Energy, 2014. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- Article numbers L16 : digital, PDF file
- Additional Creators:
- SLAC National Accelerator Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- We report on γ-ray analysis of the region containing the bright TeV source HESS J1640-465 and the closeby TeV source HESS J1641-463 using 64 months of observationswith the Fermi Large Area Telescope (LAT). Previously only one GeV source was reported in this region and was associated with HESS J1640-465. With an increased dataset and the improved sensitivity afforded by the reprocessed data (P7REP) of the LAT, we now report the detection, morphological study and spectral analysis of two distinct sources above 100 MeV. The softest emission in this region comes from the TeV source HESS J1641-463 which is well fitted with a power law of index Γ = 2.47 ± 0.05 ± 0.06 and presents no significant γ-ray signal above 10 GeV, which contrasts with its hard spectrum at TeV energies. The Fermi-LAT spectrum of the second TeV source, HESS J1640-465 is well described by a power-law shape of index Γ = 1.99 ± 0.04 ± 0.07 that links up naturally with the spectral data points obtained by the High Energy Stereoscopic System (H.E.S.S.). These new results provide new constraints concerning the identification of these two puzzling γ-ray sources.
- Published through SciTech Connect., 09/30/2014., The Astrophysical Journal. Letters 794 1 ISSN 2041-8213 AM, and M. Lemoine-Goumard; M. -H. Grondin; F. Acero; J. Ballet; H. Laffon; T. Reposeur.
- Funding Information:
View MARC record | catkey: 23495125