55,419 research outputs found
The likely Fermi Detection of the Supernova Remnant RCW 103
We report on the results from our -ray analysis of the supernova
remnant (SNR) RCW 103 region. The data were taken with the Large Area Telescope
on board the Fermi Gamma-ray Space Telescope. An extended source is found at a
position consistent with that of RCW 103, and its emission was only detected
above 1 GeV (10 significance), having a power-law spectrum with a
photon index of 2.00.1. We obtain its 1--300 GeV spectrum, and the total
flux gives a luminosity of 8.3 erg s at a source
distance of 3.3 kpc. Given the positional coincidence and property similarities
of this source with other SNRs, we identify it as the likely Fermi -ray
counterpart to RCW 103. Including radio measurements of RCW 103, the spectral
energy distribution (SED) is modeled by considering emission mechanisms based
on both hadronic and leptonic scenarios. We find that models in the two
scenarios can reproduce the observed SED, while in the hadronic scenario the
existence of SNR--molecular-cloud interaction is suggested as a high density of
the target protons is required.Comment: 6 pages, 3 figures, accepted for publication in Ap
- …