CONDON, Benjamin; LEMOINE-GOUMARD, Marianne; ACERO, Fabio; KATAGIRI, Hideaki

doi:10.3847/1538-4357/aa9be8

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CONDON, Benjamin
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

LEMOINE-GOUMARD, Marianne
Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]

ACERO, Fabio
Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]

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Astrophys.J.. 2017, vol. 851, n° 2, p. 100

Résumé en anglais

We report the first high-significance GeV γ-ray detections of supernova remnants HESS J1731−347 and SN 1006, both of which have been previously detected by imaging atmospheric Cherenkov Telescopes above 1 TeV. Using 8 years of Fermi-LAT Pass 8 data at energies between 1 GeV and 2 TeV, we detect emission at the position of HESS J1731−347 with a significance of and a spectral index of . The hardness of the index and the good connection with the TeV spectrum of HESS J1731−347 support an association between the two sources. We also confirm the detection of SN 1006 at with a spectral index of . The northeast (NE) and southwest (SW) limbs of SN 1006 were also fit separately, resulting in the detection of the NE region () and the non-detection of the SW region. The significance of different spectral components for the two limbs is , providing first indications of an asymmetry in the GeV γ-ray emission.< Réduire

Mots clés en anglais

acceleration of particles

cosmic rays

ISM: individual objects

ISM: supernova remnants

Cherenkov counter: atmosphere

HESS

power spectrum

gamma ray

supernova

asymmetry

spectral

imaging

GLAST

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Detection of two TeV shell-type remnants at GeV energies with Fermi-LAT: HESS J1731-347 and SN 1006

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