KATAGIRI, H.; YOSHIDA, K.; BALLET, J.; GRONDIN, M.H.; HANABATA, Y.; HEWITT, J.W.; KUBO, H.; LEMOINE-GOUMARD, M.

doi:10.3847/0004-637X/818/2/114

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KATAGIRI, H.

YOSHIDA, K.

BALLET, J.
Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)]

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Astrophys.J. 2016, vol. 818, n° 2, p. 114

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We report the discovery of extended gamma-ray emission measured by the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope in the region of the supernova remnant (SNR) HB 3 (G132.7+1.3) and the W3 II complex adjacent to the southeast of the remnant. W3 is spatially associated with bright (12)CO (J = 1–0) emission. The gamma-ray emission is spatially correlated with this gas and the SNR. We discuss the possibility that gamma rays originate in interactions between particles accelerated in the SNR and interstellar gas or radiation fields. The decay of neutral pions produced in nucleon–nucleon interactions between accelerated hadrons and interstellar gas provides a reasonable explanation for the gamma-ray emission. The emission from W3 is consistent with irradiation of the CO clouds by the cosmic rays accelerated in HB 3.< Réduire

Mots clés en anglais

acceleration of particles

cosmic rays

gamma rays: ISM

ISM: individual objects

ISM: supernova remnants

gamma ray: emission

nucleon nucleon: interaction

gas

supernova

GLAST

cosmic radiation

irradiation

hadron

cloud

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Fermi lat Discovery of Extended Gamma-ray Emissions in the Vicinity of the hb 3 Supernova Remnant

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