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Disentangling hadronic from leptonic emission in the composite SNR G326.3-1.8

Published online by Cambridge University Press:  17 October 2017

Justine Devin ,
Fabio Acero  and
Jean Ballet
Justine Devin
Affiliation:
Laboratoire Univers et Particules de Montpellier, CNRS/IN2P3, France email: [email protected]
Fabio Acero
Affiliation:
AIM, CEA/CNRS/Paris 7, DRF/IRFU/DAp, CEA Saclay, France email: [email protected] or [email protected]
Jean Ballet
Affiliation:
AIM, CEA/CNRS/Paris 7, DRF/IRFU/DAp, CEA Saclay, France email: [email protected] or [email protected]
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Abstract

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G326.3-1.8 (also known as MSH 15-56) has been detected in radio as a middle-aged composite supernova remnant (SNR) consisting of a SNR shell and a pulsar wind nebula (PWN) which has been crushed by the reverse shock. With the recent Fermi-LAT data release Pass 8 providing increased acceptance and angular resolution, we investigate the morphology of this SNR to disentangle the PWN from the SNR contributions and understand the nature of the γ-ray emission. We thus perform a morphological and spectral analysis from 300 MeV to 300 GeV which highlights the contributions from these two components. The simplest interpretation is hadronic emission from the SNR and harder leptonic emission from the PWN.

Keywords

supernova remnantsgamma-rays: observationsacceleration of particlescosmic rays
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S331: Supernova 1987A:30 years later - Cosmic Rays and Nuclei from Supernovae and their aftermaths , February 2017 , pp. 320 - 324
Copyright
Copyright © International Astronomical Union 2017 

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