HESS J1640–465 AND HESS J1641–463: TWO INTRIGUING TeV SOURCES IN LIGHT OF NEW FERMI -LAT OBSERVATIONS

Lemoine-Goumard, M.; Grondin, M. -H.; Acero, F.; Ballet, J.; Laffon, H.; Reposeur, T.

doi:10.1088/2041-8205/794/1/L16

HESS J1640–465 AND HESS J1641–463: TWO INTRIGUING TeV SOURCES IN LIGHT OF NEW FERMI -LAT OBSERVATIONS

Journal Article · Tue Sep 30 00:00:00 EDT 2014 · The Astrophysical Journal. Letters

DOI:https://doi.org/10.1088/2041-8205/794/1/L16· OSTI ID:1356449

^[1]; Grondin, M. -H. ^[1]; Acero, F. ^[2]; ^[2]; Laffon, H. ^[1]; Reposeur, T. ^[1]

Univ. Bordeaux (France)
Univ. Paris Diderot (France)

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.

View Accepted Manuscript (DOE)

Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1356449

Alternate ID(s):: OSTI ID: 22364587

Journal Information:: The Astrophysical Journal. Letters, Journal Name: The Astrophysical Journal. Letters Journal Issue: 1 Vol. 794; ISSN 2041-8213

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

Interstellar gas towards the TeV γ-ray sources HESS J1640−465 and HESS J1641−463 Lau, J. C.; Rowell, G.; Burton, M. G. Monthly Notices of the Royal Astronomical Society, Vol. 464, Issue 3 https://doi.org/10.1093/mnras/stw2692	journal	October 2016
Interstellar gas towards the TeV γ-ray sources HESS J1640−465 and HESS J1641−463 Lau, J. C.; Rowell, G.; Burton, M. G. Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2017-02480	text	January 2017

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