Discovery of a Radio Supernova Remnant and Non-thermal X-rays Coincident with the TeV Source HESS J1813-178
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Astrophysics, abstract
astro-ph/0505145
From: Crystal L. Brogan [view email]
Date: Sat, 7 May 2005 23:39:53 GMT (170kb)
Discovery of a Radio Supernova Remnant and Non-thermal X-rays Coincident
with the TeV Source HESS J1813-178
Authors:
C. L. Brogan,
B. M. Gaensler,
J. D. Gelfand,
J. S. Lazendic,
T. J. Lazio,
N. E. Kassim,
N. M. McClure-Griffiths
Comments: Submitted to ApJ Letters; 5 pages, Figure 1 is in color
We present the discovery of non-thermal radio and X-ray emission positionally
coincident with the TeV 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
non-thermal X-ray emission is consistent with originating from the SNR shell or
an unidentified pulsar/pulsar wind nebula; pulsed emission is not detected in
archival ASCA data. The X-ray emission falls on a direct extrapolation of the
radio synchrotron power-law before the roll-off due to radiative losses, an
unusual occurrence and remarkable coincidence if the origin of the emission is
not the same (i.e. the SNR shell). Assuming that the radio and X-ray emission
originate from the SNR shell we find that G12.8–0.0 accelerates electrons up
to at least 450 TeV, higher than for any other SNR yet observed. A model that
incorporates data spanning 18 decades in frequency suggests that inverse
Compton emission off the cosmic microwave background cannot account for the TeV
emission. Further observations are needed to confirm that the broadband
emission has a common origin.
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