Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...739...11t&link_type=abstract
The Astrophysical Journal, Volume 739, Issue 1, article id. 11 (2011).
Astronomy and Astrophysics
Astronomy
1
Acceleration Of Particles, Ism: Individual Objects: Ic443 W51C W28 W44, Ism: Supernova Remnants, Radiation Mechanisms: Non-Thermal
Scientific paper
Supernova remnants (SNRs) interacting with dense molecular clouds (MCs) are proven to be bright γ-ray emitters by recent observations in the GeV-TeV band. We theoretically investigate the multiband radiative properties of the four middle-aged SNRs IC443, W51C, W28, and W44 with a time-dependent injection model. In the model, part of the SNR shell transports into a dense MC, with the other part of the shell evolving in a relatively tenuous interstellar medium. We find a broken power law with a break energy of ~3-40 GeV that must be imposed to reproduce the observed multiwavelength spectra for the four remnants. The results indicate that the observed γ-ray spectra can be reproduced as a p-p interaction of the high-energy protons injected by the shell interacting with the MC with the dense matter, whereas the radio emission is produced via synchrotron radiation of the injected electrons from the other part of the shell for the four middle-aged SNRs.
Fang Junsheng
Tang Yuping
Zhang Lianchang
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