Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-05-07
Astrophys.J. 629 (2005) L105-L108
Astronomy and Astrophysics
Astrophysics
Accepted to ApJ Letters; 5 pages, Figures 1 and 3 are in color. Small changes from original version
Scientific paper
10.1086/491471
We present the discovery of non-thermal radio and X-ray emission positionally coincident with the TeV $\gamma$-ray source HESS J1813--178. We demonstrate that the non-thermal radio emission is due to a young shell-type supernova remnant (SNR) G12.8--0.0, and constrain its distance to be greater than 4 kpc. The X-ray emission is primarily non-thermal and is consistent with either an SNR shell or unidentified pulsar/pulsar wind nebula origin; pulsed emission is not detected in archival ASCA data. A simple synchrotron+inverse Compton model for the broadband emission assuming that all of the emission arises from the SNR shell implies maximum energies of $(30-450)(B/10 microG)^{-0.5}$ TeV. Further observations are needed to confirm that the broadband emission has a common origin and better constrain the X-ray spectrum.
Brogan Crystal L.
Gaensler Bryan M.
Gelfand Joseph D.
Kassim Namir E.
Lazendic Jasmina S.
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