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Title:
A High-Resolution Study of Nonthermal Radio and X-Ray Emission from Supernova Remnant G347.3-0.5
Authors:
Lazendic, J. S.; Slane, P. O.; Gaensler, B. M.; Reynolds, S. P.; Plucinsky, P. P.; Hughes, J. P.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AB(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AC(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AD(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.; Department of Physics, North Carolina State University, Box 8202, Raleigh, NC 27695-8202.), AE(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AF(Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854.)
Publication:
The Astrophysical Journal, Volume 602, Issue 1, pp. 271-285. (ApJ Homepage)
Publication Date:
02/2004
Origin:
UCP
ApJ Keywords:
Acceleration of Particles, ISM: Cosmic Rays, ISM: Individual: Alphanumeric: G347.3-0.5, Radiation Mechanisms: Nonthermal, ISM: Supernova Remnants, X-Rays: ISM
DOI:
10.1086/380956
Bibliographic Code:
2004ApJ...602..271L

Abstract

G347.3-0.5 is one of three shell-type supernova remnants (SNRs) in the Galaxy whose X-ray spectrum is dominated by nonthermal emission. This puts G347.3-0.5 in the small but growing class of SNRs for which the X-ray emission reveals directly the presence of extremely energetic electrons accelerated by the SNR shock. We have obtained new high-resolution X-ray and radio data on G347.3-0.5 using the Chandra X-Ray Observatory and the Australia Telescope Compact Array (ATCA), respectively. The bright northwestern peak of the SNR seen in ROSAT and ASCA images is resolved with Chandra into bright filaments and fainter diffuse emission. These features show good correspondence with the radio morphological structure, providing strong evidence that the same population of electrons is responsible for the synchrotron emission in both bands in this part of the remnant. Spectral index information from both observations is presented. We found significant difference in photon index value between bright and faint regions of the SNR shell. Spectral properties of these regions support the notion that efficient particle acceleration is occurring in the bright SNR filaments. We report the detection of linear radio polarization toward the SNR, which is most ordered at the northwestern shell where particle acceleration is presumably occurring. Using our new Chandra and ATCA data, we model the broadband emission from G347.3-0.5 with the synchrotron and inverse Compton mechanisms and discuss the conditions under which this is a plausible scenario.
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